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ICRANet Newsletter
February 2017 – March 2017
February 2017 – March 2017
SUMMARY
1. A further success of the ICRANet-CAPES program: two new PhD thesis discussions by Gabriel Guimarães Carvalho and Iarley Pereira Lobo also joining collaboration with ICRANet-CAPES post-doc Eduardo Henrique Silva Bittencourt
2. ICRANet Steering Committee meeting on the 1st of February 2017
3. Professor Ruffini in Singapore for the conference on "Cosmology, Gravitational Waves and Particles” from 6 to 10 February of 2017
4. New agreement signed on the 17th of February 2017 with the Universidade Tecnológica Federal do Paraná – Brazil
5. Three lectures with the students of Science High School Galileo Galilei in Pescara
6. In memory of Carlo Pace, member of the ICRANet Steering Committee
7. Seminars in ICRANet centers in Rome and Pescara on the 21st of February with Marco Merafina, on the 1st of March with Alessandro Nagar and of the 6th of March with Luc Blanchet
8. Upcoming international meetings
9. New students of the IRAP Ph.D program
1. A further success of the ICRANet-CAPES program: two new PhD thesis discussions by Gabriel Guimarães Carvalho and Iarley Pereira Lobo also joining collaboration with ICRANet-CAPES post-doc Eduardo Henrique Silva Bittencourt
2. ICRANet Steering Committee meeting on the 1st of February 2017
3. Professor Ruffini in Singapore for the conference on "Cosmology, Gravitational Waves and Particles” from 6 to 10 February of 2017
4. New agreement signed on the 17th of February 2017 with the Universidade Tecnológica Federal do Paraná – Brazil
5. Three lectures with the students of Science High School Galileo Galilei in Pescara
6. In memory of Carlo Pace, member of the ICRANet Steering Committee
7. Seminars in ICRANet centers in Rome and Pescara on the 21st of February with Marco Merafina, on the 1st of March with Alessandro Nagar and of the 6th of March with Luc Blanchet
8. Upcoming international meetings
9. New students of the IRAP Ph.D program
1. A further success of the ICRANet-CAPES program: two new PhD thesis discussions by Gabriel Guimarães Carvalho and Iarley Pereira Lobo also joining collaboration with ICRANet-CAPES post-doc Eduardo Henrique Silva Bittencourt
On February 2017 at the University of Rome “Sapienza” two students graduated from the IRAP PhD program, Gabriel Guimarães Carvalho and Iarley Pereira Lobo, have presented their theses in relativistic astrophysics. The IRAP PhD is jointly delivered by the Universities of Bremen, Oldenburg, Savoie, Rome, Ferrara, Nice, Grenoble. Both students were admitted to the IRAP PhD program in 2013, and the fellowships for their studies were provided by CAPES within the ICRANet-CAPES program. Their work, in collaboration with ICRANet-CAPES post-doc Eduardo Henrique Silva Bittencourt, resulted in two publications in leading refereed journals: Physical Review D (IF: 4.506) and Classical and Quantum Gravity (IF: 2.837)
Gabriel Guimarães Carvalho presented a thesis “A walk through mathematical physics with disformal trasformations and scalar field self-force effects on a particle orbiting a Reissner-Nordström black hole", and defended it on February 13th, 2017.
Commission members: Prof. Dr. Massimo Testa (University of Rome "Sapienza", Italy), Dr. Roberto Natalini (CNR – Rome) and Dr. Giampiero Esposito (INFN – Naples). Thesis Advisor Prof. Dr. Remo Ruffini, Co-Advisor Prof. Donato Bini.
This doctorate thesis is divided in two parts. The first part presents a thorough and original study of the algebraic and geometric properties of what is known as disformal metrics. Such disformal metrics arise in scalar-tensor theories of gravity, in which scalar field derivatives are coupled to the metric. The usual conformal transformation are there extended to a more general mapping of the metric, dubbed the disformal transformations. A new formalism for such metrics is developed and two physical applications are given. The first application concerns the disformal invariance of the Dirac equation. The second application, the new formalism developed for disformal metrics is used as the mathematical framework for the description of a phenomenological approach to quantum gravity known as rainbow gravity. In the second part, scalar field self-force effects on a scalar charge orbiting a Reissner-Nordström black hole are investigated. The scalar wave equation is solved analytically in a post-Newtonian framework, and the solution is used to compute the self-field as well as the components of the self-force at the location of the particle up to 7.5 post-Newtonian order. The energy fluxes radiated to infinity and down the hole are also evaluated. A comparison with previous numerical results in the Schwarzschild case shows a reasonable agreement in both strong-field and weak-field regimes. This thesis is particularly interesting in light of the recent claim about the first observation of gravitational waves with the event GW150914, which has made the problem of the gravitational radiation one of the hottest topics in relativistic astrophysics.
The co-adivsor of Gabriel Guimarães Carvalho, professor Donato Bini from the Istituto per le Applicazioni del Calcolo "M. Picone" of CNR, mentioned: “This work is a first effort in exporting explicitly gravitational self-force effects from the Schwarzschild background to the Reissner-Nordstrom one. The application has been performed here at the simplest level of scalar self-force effects and, indeed, at this level all the subtleties and difficulties of the underlying formalism have been completely solved. So far a future step will consist in considering both gravitational and electromagnetic perturbations of the Reissner-Nordstrom black hole. These results have been published in Physical Review D (IF: 4.506) The implications for relativistic astrophysics of these studies, i.e. the main motivation of the work itself, are of great interest.”
List of publications of Gabriel Guimarães Carvalho:
1. D. Bini, G.G. Carvalho and Andrea Geralico; "Scalar field self-force effects on a particle orbiting a Reissner-Nordström black hole", Phys. Rev. D 94, 124028 (2016), IF: 4.506.
2. G.G . Carvalho , I. P. Lobo and E. Bittencourt - “Extended disformal approach in the scenario of rainbow gravity”, Physical Review D 93, 044005 (2016), IF: 4.506.
3. E. Bittencourt, I. P. Lobo, G.G. Carvalho - “On the disformal invariance of the Dirac equation”, Class. Quantum. Grav. 32, 185016 (2015) IF: 2.837.
Originally Gabriel Guimarães Carvalho is from Universidade Federal de Pernambuco Recife, PE, Brazil. ICRANet has a collaboration agreement with this University. The fellowship for this PhD study was provided by CAPES within the CAPES-ICRANet program. For more information please see the thesis and the video of thesis discussion.
Iarley Pereira Lobo presented a thesis “Geometrical approach to Planck-scale deformations of phase spaces", and defended it on Friday February 24th, 2017 at the University of Rome "Sapienza".
Commission members: Prof. Paolo Pani (University of Rome "Sapienza", Italy), Prof. Salvatore Mignemi (University of Cagliari, Italy); Prof. Stefano Liberati (Sissa Trieste). Thesis Advisor: Prof. Giovanni Amelino-Camelia.
In this thesis some semi-classical properties of Quantum Gravity are described by the use of non-trivial geometries as a common language. Deformed interactions that emerge from the deformation of the Lorentz symmetry by means of curved momentum spaces are described. In particular, the problem of how particles would interact if momentum space had an anti-de Sitter geometry is considered: it is shown that some usual paths followed in the de Sitter momentum space literature could not be followed in the anti-de Sitter case due to some internal inconsistencies, and some alternative scenarios that could be considered are presented. Regarding spacetime, also a link between the disformal metrics literature and the Rainbow Gravity one is exhibited, that is consistent with the deformed causal structure, presents an inherent group structure and is intrinsically covariant under coordinate transformations. Finally, an alternative way of describing the natural spacetime for Modified Dispersion Relations is presented by means of a generalized Finsler geometry (which is intimately attached to variational techniques) with a well-defined massless limit, which allows to analyze its relativistic properties and to derive observables that are compatible with this picture.
The supervisor of Dr. Lobo, Prof. Giovanni Amelino-Camelia from the University of Rome “Sapienza”, mentioned: “This is a study that contributes to the recent wave of interest in "dimensionally reduced" 3D quantum gravity, as a toy model for "real" 4D quantum gravity. 3D quantum gravity is still complex, but much less than 4D quantum gravity and most of the conceptual complexity of the quantum-gravity problem is preserved in the 3D case. As gradually over the last decade 3D quantum gravity was better understood, considerable interest was gained by the fact that it is characterized by deformed relativistic symmetries and momentum-space curvature. The most significant result of the PhD work of Iarley Lobo has been to provide for the first time a systematic investigation of pairings of metric and affine connection for 4D momentum space, establishing that 3 such pairings preserve the logical structure of the 3D results. The relativistic properties of these 3 candidates models have been studied in detail, also providing some avenues for phenomenology based on the analysis of gamma-ray-burst signal structure.”
List of publications of Iarley Pereira Lobo:
1. E. Bittencourt, I. P. Lobo and G. G. Carvalho, On the disformal invariance of the Dirac equation, Class. Quant. Grav. 32 185016 (2015).
2. I. P. Lobo, A. B. Barreto and C. Romero, Space-time singularities in Weyl manifolds, Eur. Phys. J. C75 448 (2015).
3. G. G. Carvalho, I. P. Lobo and E. Bittencourt, Extended disformal approach in the scenario of Rainbow Gravity, Phys. Rev. D93 044005 (2016).
4. I. P. Lobo and G. Palmisano, Geometric interpretation of Planck-scale-deformed co-products, Int. J. Mod. Phys. Conf. Ser. 41 1660126 (2016).
5. I. P. Lobo, G. Palmisano and G. Amelino-Camelia, Geometric picture of DSR-relativisitc theories with de Sitter and anti-de Sitter momentum spaces,submitted to IJMP Conf. Ser. (2015).
6. I. P. Lobo, N. Loret and F. Nettel, Rainbows without unicorns: Metric structures in theories with Modified Dispersion Relations, arXiv: 1610.04277, submitted to EPJ C.
7. I. P. Lobo, Frame transformations in Brans-Dicke theory from the viewpoint of Weyl geometry, arXiv:1610.05004, submitted to IJMP D.
8. I. P. Lobo, N. Loret and F. Nettel, Investigation of Finsler geometry as a generalization to curved spacetime of Planck-scale-deformed relativity in the de Sitter case, Phys. Rev. D95 046015 (2017).
Originally Iarley Pereira Lobo is from Universidade Federal da Paraíba, João Pessoa, PB, Brazil. ICRANet has a collaboration agreement with this University. The fellowship for this PhD study was provided by CAPES within the CAPES-ICRANet program. For more information please see the thesis and the video of thesis discussion.
The thesis work of Gabriel Guimarães Carvalho and Iarley Pereira Lobo was successfully marked by the collaboration with Eduardo Henrique Silva Bittencourt, who co-authored two publications with them (no. 3 and no. 7 in the list below).
Eduardo Henrique Silva Bittencourt has visited ICRANet twice, from 20 of October to 23 of November 2011, and from 2 to 19 of October 2012, and then has been admitted to the CAPES-ICRANet Postdoctoral program. He worked at “Sapienza” University of Rome, from December 2013 to November 2015. He currently holds a Professor position at Universidade Federal de Itajubá (UNIFEI), Itajubá, MG, Brazil. ICRANet has a collaboration agreement with this University.
List of publications of Eduardo Henrique Silva Bittencourt:
1. Bini, Donato, Bittencourt, Eduardo, Geralico, Andrea, Jantzen, Robert T, Slicing black hole spacetimes. International Journal of Geometric Methods in Modern Physics, Volume 12, Issue 7, id. 1550070, (2015).
2. Bini, Donato; Bittencourt, Eduardo; Geralico, Andrea, Massless Dirac particles in the vacuum C-metric, Classical and Quantum Gravity, Volume 32, Issue 21, article id. 215010 (2015). 3. G.G . Carvalho , I. P. Lobo and E. Bittencourt - “Extended disformal approach in the scenario of rainbow gravity”, Physical Review D 93, 044005 (2016).
4. Bittencourt, E.; Moschella, U.; Novello, M.; Toniato, J. D., More about scalar gravity, Physical Review D, Volume 93, Issue 12, id.124023 (2016).
5. Bittencourt, Eduardo; Pereira, Jonas P.; Smolyaninov, Igor I.; Smolyaninova, Vera N., The flexibility of optical metrics, Classical and Quantum Gravity, Volume 33, Issue 16, article id. 165008 (2016).
6. Santos, G. B.; Bittencourt, E.; Salim, J. M., Scalar perturbations in a Friedmann-like metric with non-null Weyl tensor, Journal of Cosmology and Astroparticle Physics, Issue 06, article id. 013, (2015).
7. E. Bittencourt, I. P. Lobo, G.G. Carvalho - “On the disformal invariance of the Dirac equation”, Class. Quantum. Grav. 32, 185016 (2015).
Gabriel Guimarães Carvalho
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Iarley Pereira Lobo
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Eduardo Henrique Silva Bittencourt
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Commission members: Prof. Dr. Massimo Testa (University of Rome "Sapienza", Italy), Dr. Roberto Natalini (CNR – Rome) and Dr. Giampiero Esposito (INFN – Naples). Thesis Advisor Prof. Dr. Remo Ruffini, Co-Advisor Prof. Donato Bini.
This doctorate thesis is divided in two parts. The first part presents a thorough and original study of the algebraic and geometric properties of what is known as disformal metrics. Such disformal metrics arise in scalar-tensor theories of gravity, in which scalar field derivatives are coupled to the metric. The usual conformal transformation are there extended to a more general mapping of the metric, dubbed the disformal transformations. A new formalism for such metrics is developed and two physical applications are given. The first application concerns the disformal invariance of the Dirac equation. The second application, the new formalism developed for disformal metrics is used as the mathematical framework for the description of a phenomenological approach to quantum gravity known as rainbow gravity. In the second part, scalar field self-force effects on a scalar charge orbiting a Reissner-Nordström black hole are investigated. The scalar wave equation is solved analytically in a post-Newtonian framework, and the solution is used to compute the self-field as well as the components of the self-force at the location of the particle up to 7.5 post-Newtonian order. The energy fluxes radiated to infinity and down the hole are also evaluated. A comparison with previous numerical results in the Schwarzschild case shows a reasonable agreement in both strong-field and weak-field regimes. This thesis is particularly interesting in light of the recent claim about the first observation of gravitational waves with the event GW150914, which has made the problem of the gravitational radiation one of the hottest topics in relativistic astrophysics.
The co-adivsor of Gabriel Guimarães Carvalho, professor Donato Bini from the Istituto per le Applicazioni del Calcolo "M. Picone" of CNR, mentioned: “This work is a first effort in exporting explicitly gravitational self-force effects from the Schwarzschild background to the Reissner-Nordstrom one. The application has been performed here at the simplest level of scalar self-force effects and, indeed, at this level all the subtleties and difficulties of the underlying formalism have been completely solved. So far a future step will consist in considering both gravitational and electromagnetic perturbations of the Reissner-Nordstrom black hole. These results have been published in Physical Review D (IF: 4.506) The implications for relativistic astrophysics of these studies, i.e. the main motivation of the work itself, are of great interest.”
List of publications of Gabriel Guimarães Carvalho:
1. D. Bini, G.G. Carvalho and Andrea Geralico; "Scalar field self-force effects on a particle orbiting a Reissner-Nordström black hole", Phys. Rev. D 94, 124028 (2016), IF: 4.506.
2. G.G . Carvalho , I. P. Lobo and E. Bittencourt - “Extended disformal approach in the scenario of rainbow gravity”, Physical Review D 93, 044005 (2016), IF: 4.506.
3. E. Bittencourt, I. P. Lobo, G.G. Carvalho - “On the disformal invariance of the Dirac equation”, Class. Quantum. Grav. 32, 185016 (2015) IF: 2.837.
Originally Gabriel Guimarães Carvalho is from Universidade Federal de Pernambuco Recife, PE, Brazil. ICRANet has a collaboration agreement with this University. The fellowship for this PhD study was provided by CAPES within the CAPES-ICRANet program. For more information please see the thesis and the video of thesis discussion.
Iarley Pereira Lobo presented a thesis “Geometrical approach to Planck-scale deformations of phase spaces", and defended it on Friday February 24th, 2017 at the University of Rome "Sapienza".
Commission members: Prof. Paolo Pani (University of Rome "Sapienza", Italy), Prof. Salvatore Mignemi (University of Cagliari, Italy); Prof. Stefano Liberati (Sissa Trieste). Thesis Advisor: Prof. Giovanni Amelino-Camelia.
In this thesis some semi-classical properties of Quantum Gravity are described by the use of non-trivial geometries as a common language. Deformed interactions that emerge from the deformation of the Lorentz symmetry by means of curved momentum spaces are described. In particular, the problem of how particles would interact if momentum space had an anti-de Sitter geometry is considered: it is shown that some usual paths followed in the de Sitter momentum space literature could not be followed in the anti-de Sitter case due to some internal inconsistencies, and some alternative scenarios that could be considered are presented. Regarding spacetime, also a link between the disformal metrics literature and the Rainbow Gravity one is exhibited, that is consistent with the deformed causal structure, presents an inherent group structure and is intrinsically covariant under coordinate transformations. Finally, an alternative way of describing the natural spacetime for Modified Dispersion Relations is presented by means of a generalized Finsler geometry (which is intimately attached to variational techniques) with a well-defined massless limit, which allows to analyze its relativistic properties and to derive observables that are compatible with this picture.
The supervisor of Dr. Lobo, Prof. Giovanni Amelino-Camelia from the University of Rome “Sapienza”, mentioned: “This is a study that contributes to the recent wave of interest in "dimensionally reduced" 3D quantum gravity, as a toy model for "real" 4D quantum gravity. 3D quantum gravity is still complex, but much less than 4D quantum gravity and most of the conceptual complexity of the quantum-gravity problem is preserved in the 3D case. As gradually over the last decade 3D quantum gravity was better understood, considerable interest was gained by the fact that it is characterized by deformed relativistic symmetries and momentum-space curvature. The most significant result of the PhD work of Iarley Lobo has been to provide for the first time a systematic investigation of pairings of metric and affine connection for 4D momentum space, establishing that 3 such pairings preserve the logical structure of the 3D results. The relativistic properties of these 3 candidates models have been studied in detail, also providing some avenues for phenomenology based on the analysis of gamma-ray-burst signal structure.”
List of publications of Iarley Pereira Lobo:
1. E. Bittencourt, I. P. Lobo and G. G. Carvalho, On the disformal invariance of the Dirac equation, Class. Quant. Grav. 32 185016 (2015).
2. I. P. Lobo, A. B. Barreto and C. Romero, Space-time singularities in Weyl manifolds, Eur. Phys. J. C75 448 (2015).
3. G. G. Carvalho, I. P. Lobo and E. Bittencourt, Extended disformal approach in the scenario of Rainbow Gravity, Phys. Rev. D93 044005 (2016).
4. I. P. Lobo and G. Palmisano, Geometric interpretation of Planck-scale-deformed co-products, Int. J. Mod. Phys. Conf. Ser. 41 1660126 (2016).
5. I. P. Lobo, G. Palmisano and G. Amelino-Camelia, Geometric picture of DSR-relativisitc theories with de Sitter and anti-de Sitter momentum spaces,submitted to IJMP Conf. Ser. (2015).
6. I. P. Lobo, N. Loret and F. Nettel, Rainbows without unicorns: Metric structures in theories with Modified Dispersion Relations, arXiv: 1610.04277, submitted to EPJ C.
7. I. P. Lobo, Frame transformations in Brans-Dicke theory from the viewpoint of Weyl geometry, arXiv:1610.05004, submitted to IJMP D.
8. I. P. Lobo, N. Loret and F. Nettel, Investigation of Finsler geometry as a generalization to curved spacetime of Planck-scale-deformed relativity in the de Sitter case, Phys. Rev. D95 046015 (2017).
Originally Iarley Pereira Lobo is from Universidade Federal da Paraíba, João Pessoa, PB, Brazil. ICRANet has a collaboration agreement with this University. The fellowship for this PhD study was provided by CAPES within the CAPES-ICRANet program. For more information please see the thesis and the video of thesis discussion.
The thesis work of Gabriel Guimarães Carvalho and Iarley Pereira Lobo was successfully marked by the collaboration with Eduardo Henrique Silva Bittencourt, who co-authored two publications with them (no. 3 and no. 7 in the list below).
Eduardo Henrique Silva Bittencourt has visited ICRANet twice, from 20 of October to 23 of November 2011, and from 2 to 19 of October 2012, and then has been admitted to the CAPES-ICRANet Postdoctoral program. He worked at “Sapienza” University of Rome, from December 2013 to November 2015. He currently holds a Professor position at Universidade Federal de Itajubá (UNIFEI), Itajubá, MG, Brazil. ICRANet has a collaboration agreement with this University.
List of publications of Eduardo Henrique Silva Bittencourt:
1. Bini, Donato, Bittencourt, Eduardo, Geralico, Andrea, Jantzen, Robert T, Slicing black hole spacetimes. International Journal of Geometric Methods in Modern Physics, Volume 12, Issue 7, id. 1550070, (2015).
2. Bini, Donato; Bittencourt, Eduardo; Geralico, Andrea, Massless Dirac particles in the vacuum C-metric, Classical and Quantum Gravity, Volume 32, Issue 21, article id. 215010 (2015). 3. G.G . Carvalho , I. P. Lobo and E. Bittencourt - “Extended disformal approach in the scenario of rainbow gravity”, Physical Review D 93, 044005 (2016).
4. Bittencourt, E.; Moschella, U.; Novello, M.; Toniato, J. D., More about scalar gravity, Physical Review D, Volume 93, Issue 12, id.124023 (2016).
5. Bittencourt, Eduardo; Pereira, Jonas P.; Smolyaninov, Igor I.; Smolyaninova, Vera N., The flexibility of optical metrics, Classical and Quantum Gravity, Volume 33, Issue 16, article id. 165008 (2016).
6. Santos, G. B.; Bittencourt, E.; Salim, J. M., Scalar perturbations in a Friedmann-like metric with non-null Weyl tensor, Journal of Cosmology and Astroparticle Physics, Issue 06, article id. 013, (2015).
7. E. Bittencourt, I. P. Lobo, G.G. Carvalho - “On the disformal invariance of the Dirac equation”, Class. Quantum. Grav. 32, 185016 (2015).
2. ICRANet Steering Committee meeting on the 1st of February 2017
On the 1st of February 2017 the 16th Steering Committee of ICRANet took place. The following members were present: Prof. Ashot Kocharian (Representative of Armenia), Fabrizio Nicoletti, Cons. Enrico Padula, Prof.ssa Immacolata Pannone (DGSP Representatives of the Italian Ministry of Foreign Affairs and International Cooperation - Italy), Dr. Antonio Bartolini (General Government Accountancy IGAE Uff. IX - Representative of Ministry of Economy), Dr. Giulietta Iorio on behalf of Dr. Vincenzo Di Felice (Representative of Ministry of Education, Universities and Research), Prof. Carlo Luciano Bianco with the proxy of Prof. Remo Ruffini (Representative of ICRA), Prof. She Sheng Xue with the proxy of Prof. Xiaohui Fan (Representative of the University of Arizona in Tucson), Prof. Jorge Armando Rueda Hernandez with the proxy of Prof. C. W. Francis Everitt, Chairman (Representative of Stanford University), Ing. Carlo Pace (Representative of the Municipality of Pescara for the Mayor, Avv. Marco Alessandrini) and Prof. Remo Ruffini (Director of ICRANet). In addition ICRANet Auditors were present: Cons. dr. Giacinto Dammicco (Advisor, Italian Court of Auditors) and Dott.ssa Claudia Martinelli. Participated as observer also Dr. Piero Redolfi (Accounting consultant).
3. Professor Ruffini in Singapore for the conference on “Cosmology, Gravitational Waves and Particles” from 6 to 10 of February 2017
On February prof. Ruffini went in Singapore, at Nanyang Executive Centre, Nanyang Technological University, for the conference on “Cosmology, Gravitational Waves and Particles”. In this occasion, the Director of ICRANet has delivered a talk titled "Gamma Ray Bursts, from Supernovae to Hypernovae to Binary Drive Hypernovae" (Details can be found here)
4. New agreement signed on the 17th of February 2017 with the Universidade Tecnológica Federal do Paraná – Brazil
On the 17th of February was signed the agreement between ICRANet and the UTFPR, Federal University of Technology. This new agreement was signed by Prof. Dr. Luiz Alberto Pilatti, Rector of the University, and Prof. Ruffini, Director of ICRANet. This agreement will be valid for 5 years and the joint activities will consist of: to give in a mutual way scientific and cultural support; to develop joint investigation projects; to develop cooperation forms and actions in other areas of mutual interest; realization of staff and students exchange programs.
For the agreement click here.
For the agreement click here.
5. Three lectures with the students of Science High School Galileo Galilei in Pescara
On February and March the ICRANet Center of Pescara has hosted the students of Science High School Galileo Galilei for three lectures related to the project “school-work”. In these three occasions the lectures were given by Dr. Alessandra Di Cecco on “Dangers, natural and artificial, that come from the space”, by Dr. Gregory Vereshchagin on “Big Bang: primordial cosmology and the formation of the large scale structure” and by Professor Costantino Sigismondi about spectroscopy, photometry, mathematical fits, physical models, scientific theory, and the Occam's razor.
Details (in Italian) can be found
here
On March 28, 2017, Carlo Pace, member of ICRANet Steering Committee for the Municipality of Pescara, passed away. As Mayor of Pescara, he was characterized with a constant and passionate ample vision of the future development of Pescara and of Abruzzo. Since 1994 he expressed his will to host the ICRANet headquarters in the town of Pescara. He personally followed the restructuring of the ancient train station in to an international research center. In 2005 ICRANet was unanimously approved by the Italian Parliament. Carlo followed constantly, day by day, with great understanding and passion, ICRANet research and teaching activities.
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6. In memory of Carlo Pace, member of the ICRANet Steering Committee
On March 28, 2017, Carlo Pace, member of ICRANet Steering Committee for the Municipality of Pescara, passed away. As Mayor of Pescara, he was characterized with a constant and passionate ample vision of the future development of Pescara and of Abruzzo. Since 1994 he expressed his will to host the ICRANet headquarters in the town of Pescara. He personally followed the restructuring of the ancient train station in to an international research center. In 2005 ICRANet was unanimously approved by the Italian Parliament. Carlo followed constantly, day by day, with great understanding and passion, ICRANet research and teaching activities.
7. Seminars in ICRANet centers in Rome and Pescara on the 21st of February with Marco Merafina, on the 1st of March with Alessandro Nagar and on the 6th of March with Luc Blanchet
1) On February 21, 2017, Dr. Marco Merafina, of the Department of Physics, University of Rome La Sapienza, has given a seminar at the ICRANet center of Pescara, with the title: "Gravity and thermodynamics: a new point of view in the analysis of equilibrium and dynamical evolution of globular clusters".
Dr. Merafina presented a new approach to theoretical study of the dynamics of globular clusters, by applying thermodynamic principles to a Boltzmann distribution function with an Hamiltonian function which contains an effective potential depending on the kinetic energy of the stars, due to the effect of tidal interactions induced by the hosting galaxy. In this theory new relations for the thermodynamical equilibrium in presence of a gravitational potential, a different form of the virial theorem are obtained, and the concepts of thermodynamic and kinetic temperature, pressure and chemical potential (the intensive quantities) are introduced. It is shown that a globular cluster can be described as a model containing regions with positive and negative specific heat producing thermodynamic instabilities which drive the systems towards the gravothermal catastrophe, without the necessity of an external thermal bath. The influence of the effective potential on the virial theorem is described, together with the related consequences on the gravothermal stability limit for star clusters through the analysis of the caloric curve and its critical points. This new limit is different from one obtained by Katz in 1978 and it is in complete accordance with the value related to the maximum of cluster distribution constructed by data from Harris Catalogue for globular clusters.
Direct observation of gravitational radiation from astrophysical objects promises a revolution in astronomy and astrophysics, as it opens new observational window to the Universe. Recent claims on possible discovery of gravitational wave signals https://en.wikipedia.org/wiki/First_observation_of_gravitational_waves has attracted much attention in scientific community and general public. ICRANet invited two leading experts in this field to discuss theoretical progress in gravitation wave emission.
2) On March 1st Dr. Alessandro Nagar has given a seminar in Rome, at Aula Rasetti, Physics Department, University of Rome La Sapienza. Dr. Nagar is one of the leading theorists and a collaborator of Thibault Damour. He is an author of the The IHES effective-one-body (EOB) code, treating the general relativistic two body problem. The subject of this seminar was “binary black hole merger : the theory interfacing numerical and analytical relativity”. Dr. Nagar presented a very comprehensive talk with details about the semi-analytical approach to calculations of gravitational wave templates as well as the use of simulations from Numerical Relativity as input for unknown parameters in the EOB model. The lecture can be found here: http://www.icranet.org/documents/nagar_icranet.pdf
3) On March 6, 2017, Professor Luc Blanchet, Director of Research in CNRS - Institut d'Astrophysique de Paris, France, has given a seminar on “Gravitational waves and the two-body problem in GR” at the Physics Department, University of Rome La Sapienza.
2) On March 1st Dr. Alessandro Nagar has given a seminar in Rome, at Aula Rasetti, Physics Department, University of Rome La Sapienza. Dr. Nagar is one of the leading theorists and a collaborator of Thibault Damour. He is an author of the The IHES effective-one-body (EOB) code, treating the general relativistic two body problem. The subject of this seminar was “binary black hole merger : the theory interfacing numerical and analytical relativity”. Dr. Nagar presented a very comprehensive talk with details about the semi-analytical approach to calculations of gravitational wave templates as well as the use of simulations from Numerical Relativity as input for unknown parameters in the EOB model. The lecture can be found here: http://www.icranet.org/documents/nagar_icranet.pdf
3) On March 6, 2017, Professor Luc Blanchet, Director of Research in CNRS - Institut d'Astrophysique de Paris, France, has given a seminar on “Gravitational waves and the two-body problem in GR” at the Physics Department, University of Rome La Sapienza.
Prof. Blanchet is one of the leading theoreticians working on Post-Newtonian (PN) approximations to gravitational radiation in the general relativistic two body problem. In the seminar he presented most recent advances in this field. He underlined, that: "The theoretical and numerical works on the two-body problem in general relativity play a very important role when deciphering and interpreting the gravitational wave signals. In particular, state-of-the-art approximation methods in GR permit to build very precise and reliable gravitational wave templates to be used in the data analysis of detectors. The flagship of these methods is the post-Newtonian (PN) approximation which describes both the dynamics of two compact bodies (including black holes) and the gravitational radiation emitted."
8. Upcoming international meetings
ICRANet-Minsk workshop on high energy astrophysics
National Academy of Sciences of Belarus, Minsk, Belarus, April 26-28, 2017
Meeting Rationale
ICRANet-Minsk workshop on high energy astrophysics will be the first scientific event organized in the new ICRANet center in Minsk, Belarus. It will be a parallel meeting to a larger symposium on nuclear physics at the National Academy of Sciences of Belarus. This workshop is an opportunity for young scientists working in relativistic astrophysics from European and Asian countries to exchange experience and to present results in their fields to the Belarusian scientists. This event will be organized within the 2017 Year of Science, declared by the Presidential decree. Official webpage of the meeting: http://www.icranet.org/imw
Fifth Bego Rencontres IRAP Ph.D. school
Villa Ratti, Nice - May 15th-19th, 2017
The school will take place in Nice from the 15 to the 19th of May. It is traditionally devoted to frontier topics in relativistic astrophysics and to the students of the IRAP PhD Program. This meeting is dedicated to gravitational waves in the strong field limit and is open to all interested scientists and graduate students. We recall that the IRAP-PhD is coordinated by ICRANet, involving various universities and research centres, and the diploma are jointly delivered by all the universities participating in the program: University of Bremen (Germany), University of Ferrara (Italy), University of Nice Sophia Antipolis (France), University of Oldenburg (Germany), University of Rome “La Sapienza” (Italy), University of Savoie (France), University of Grenoble (France).
Invited lecturers include: Donato Bini, Luc Blanchet, Christian Cherubini, Nathalie Deruelle, Simonetta Filippi, Mile Karlica, Jutta Kunz-Drolshagen, Claus Lämmerzahl, Felix Mirabel, Marco Muccino, Tsvi Piran, Jose Rodriguez, Jorge Rueda, Remo Ruffini, Narek Sahakyan, Gregory Vereshchagin, Yu Wang, She-Sheng Xue.
Directors: Prof. Remo Ruffini - Prof. Pascal Chardonnet
Faculty: Giovanni Amelino-Camelia, Stefano Ansoldi, Ulisses Barres de Almeida, Vladimir Belinski, Carlo Luciano Bianco, Donato Bini, Sandip Kumar Chakrabarti, Pascal Chardonnet, Christian Cherubini, Andreas Eckart, Thibault Damour, Jann Einasto, Sergio Frasca, Filippo Frontera, Jean-Marc Gambaudo, Paolo Giommi, Luis Herrera Cometta, Yipeng Jing, Hagen Kleinert, Michael Kramer, Jutta Kunz-Drolshagen, Luca Lamagna, Claus Lämmerzahl, Olivier Legrand, Francois Mignard, Hermann Nicolai, Kjell Rosquist, Jorge Rueda, Remo Ruffini, Felix Ryde, Farrokh Vakili, Gregory Vereshchagin, She Sheng Xue, Shuangnan Zhang. Official webpage of the meeting: http://www.icranet.org/5bego
The 2017 Annual meeting of the Division of Gravitation and Relativistic Astrophysics of the Chinese Physical Society /The Fifth Galileo-Xu Guangqai Meeting
School of Physical Science and Technology - Southwest Jiaotong University, Chengdu – China - June 25 -30, 2017
Scientific Objectives
This year jointed with the annual meeting of the Division of Gravitation and Relativistic Astrophysics of the Chinese Physical Society, the fifth Galileo-Xu Quangqi meeting will be held in the School of Physical Science and Technology, Southwest Jiaotong University, at Chengdu – China on June 25 -30.
The meeting is particularly dedicated to recall the roots of the modern scientific research in the East and the West and review the recent progress in one of the most advanced fields of scientific research: the one of relativistic astrophysics. We will review current progress in Relativistic Astrophysics made possible by astronomical observations of the Sun, of the Stars and of the Universe, and the current developments of theoretical studies of gravitation and cosmology as well as other fundamental physics. These results have been achieved thanks to the theories of Albert Einstein and to the unprecedented numbers of observational techniques: in X-ray, Gamma-ray, optical wave-lengths from space based observatories, in radio telescopes wavelengths from telescopes on the ground as well as in particle physics from underground observatories. The International Conference on Gravitational and Cosmology the fifth Galileo-Xu Guangqi meeting follows the 1st, 2rd, the 3rd and 4th meeting of this series held on October 2009 in Shanghai - China (http://www.icranet.org/galileo-xuguangqi), on July 2010 in Ventimiglia - Italy and Nice - France (http://www.icranet.org/3gx) and on May 2015 always in Beijing (http://www.icranet.org/4gx) – China. The goal is to create a forum for strategic exchanges between eastern and western science at the highest level dealing with relativistic astrophysics and related fundamental theoretical, experimental and observational fields. The aim is to enlarge the audience from the one strictly Chinese and Italian to one embracing European and western scientific interests and the eastern ones. Therefore a broader participation from Korea and Taiwan is encouraged, as well as a participation of scientists from Europe and the Americas.
Official webpage of the meeting: http://www.icranet.org/5gx
XIII International Conference on Gravitation, Astrophysics and Cosmology- 15th Italian-Korean Symposium on Relativistic Astrophysics - A joint meeting
Ewha Womans University - Seoul, Korea, July 3 to 7, 2017
This symposium started in 1987, then continued for every two years alternatively in Korea and Italy with the support from Korea Science and Engineering Foundation (KOSEF), Consiglio Nazionale delle Ricerche (CNR), International Center for Relativistic Astrophysics Network (ICRANet) and hosting institutes. Main purpose of this symposium is to accelerate the exchange between scientists of Italy and Korea, especially young researchers. Traditionally, the subjects of this series of symposium have been mainly theoretical astrophysics, especially in the fields of relativistic astrophysics. In the symposium, results of relevant astrophysical observations and experiments, as well as their theoretical understanding will be presented, including gravitational wave detection experiments in which Korean astrophysicists are actively participating.
This year the symposium is held in conjunction with the XIII International Conference on Gravitation, Astrophysics and Cosmology (ICGAC-13), a series of biennial conferences on Gravitation, Astrophysics and Cosmology which takes place in the Asia-Pacific region with the goal to promote cooperation among the member countries and within an international context, to promote high level studies on hot topics and to encourage young physicists on these fields.
Official webpages of the meeting: http://www.icranet.org/ik15 and https://www.apctp.org/plan.php/ICGAC-IK
National Academy of Sciences of Belarus, Minsk, Belarus, April 26-28, 2017
ICRANet-Minsk workshop on high energy astrophysics will be the first scientific event organized in the new ICRANet center in Minsk, Belarus. It will be a parallel meeting to a larger symposium on nuclear physics at the National Academy of Sciences of Belarus. This workshop is an opportunity for young scientists working in relativistic astrophysics from European and Asian countries to exchange experience and to present results in their fields to the Belarusian scientists. This event will be organized within the 2017 Year of Science, declared by the Presidential decree. Official webpage of the meeting: http://www.icranet.org/imw
Fifth Bego Rencontres IRAP Ph.D. school
Villa Ratti, Nice - May 15th-19th, 2017
The school will take place in Nice from the 15 to the 19th of May. It is traditionally devoted to frontier topics in relativistic astrophysics and to the students of the IRAP PhD Program. This meeting is dedicated to gravitational waves in the strong field limit and is open to all interested scientists and graduate students. We recall that the IRAP-PhD is coordinated by ICRANet, involving various universities and research centres, and the diploma are jointly delivered by all the universities participating in the program: University of Bremen (Germany), University of Ferrara (Italy), University of Nice Sophia Antipolis (France), University of Oldenburg (Germany), University of Rome “La Sapienza” (Italy), University of Savoie (France), University of Grenoble (France).
Directors: Prof. Remo Ruffini - Prof. Pascal Chardonnet
Faculty: Giovanni Amelino-Camelia, Stefano Ansoldi, Ulisses Barres de Almeida, Vladimir Belinski, Carlo Luciano Bianco, Donato Bini, Sandip Kumar Chakrabarti, Pascal Chardonnet, Christian Cherubini, Andreas Eckart, Thibault Damour, Jann Einasto, Sergio Frasca, Filippo Frontera, Jean-Marc Gambaudo, Paolo Giommi, Luis Herrera Cometta, Yipeng Jing, Hagen Kleinert, Michael Kramer, Jutta Kunz-Drolshagen, Luca Lamagna, Claus Lämmerzahl, Olivier Legrand, Francois Mignard, Hermann Nicolai, Kjell Rosquist, Jorge Rueda, Remo Ruffini, Felix Ryde, Farrokh Vakili, Gregory Vereshchagin, She Sheng Xue, Shuangnan Zhang. Official webpage of the meeting: http://www.icranet.org/5bego
The 2017 Annual meeting of the Division of Gravitation and Relativistic Astrophysics of the Chinese Physical Society /The Fifth Galileo-Xu Guangqai Meeting
School of Physical Science and Technology - Southwest Jiaotong University, Chengdu – China - June 25 -30, 2017
Scientific Objectives
Official webpage of the meeting: http://www.icranet.org/5gx
XIII International Conference on Gravitation, Astrophysics and Cosmology- 15th Italian-Korean Symposium on Relativistic Astrophysics - A joint meeting
Ewha Womans University - Seoul, Korea, July 3 to 7, 2017
This symposium started in 1987, then continued for every two years alternatively in Korea and Italy with the support from Korea Science and Engineering Foundation (KOSEF), Consiglio Nazionale delle Ricerche (CNR), International Center for Relativistic Astrophysics Network (ICRANet) and hosting institutes. Main purpose of this symposium is to accelerate the exchange between scientists of Italy and Korea, especially young researchers. Traditionally, the subjects of this series of symposium have been mainly theoretical astrophysics, especially in the fields of relativistic astrophysics. In the symposium, results of relevant astrophysical observations and experiments, as well as their theoretical understanding will be presented, including gravitational wave detection experiments in which Korean astrophysicists are actively participating.
Official webpages of the meeting: http://www.icranet.org/ik15 and https://www.apctp.org/plan.php/ICGAC-IK
9. New students of the IRAP Ph.D programe
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Baghmanyan, Vardan (Armenia) Yerevan State University “Currently, I am PhD student in Yerevan State University but for my PhD thesis I work in ICRANet Armenia. In the PhD thesis, I study X-ray and gamma-ray emissions processes in the radio galaxies and blazars (BL Lacs and FSRQs).” |
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Bedić, Suzana (Croatia) University of Rome "La Sapienza" "After graduating on University of Zagreb in Croatia, I have enrolled in IRAP PhD program. While in a process of defining my thesis topic, I am currently working on gamma-ray bursts and my research interests also include general relativity, quantum gravity, black holes, dark matter and cosmology." |
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Campion, Stefano (Italy) University of Rome "La Sapienza" “I’m graduated in Astronomy and Astrophysics at the University of Rome "La Sapienza". My research topic is the study of the production and characteristics of the neutrino in the GRB (according to the supercritical accretion model) and their detection on Earth. Other research interests are: the study, the dynamic point of view of self-gravitating systems (galaxies, globular clusters, galactic halos).” |
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Chen, Yen-Chen (Taiwan) National Central University, Graduate Institute of Astronomy “I graduated from the Graduate Institute of Astronomy of National Central University in Taiwan. I have not decided my Ph.D topic and my research interesting is AGNs, dwarf galaxy, and dark matter.” |
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Gasparyan, Sargis (Armenia) National Academy of Sciences of Armenia “I'm coming from Yerevan State University. I am first year PhD student in ICRANet-Armenia. I study high energy gamma ray emission processes in the Blazars.” |
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Marongiu, Marco (Italy) Università degli Studi di Ferrara Master's Degree in Physics at Cagliari University with a thesis about simulations of observations of pulsars with the Sardinia Radio Telescope (SRT). Graduate student enrolled in the Ph.D. programme in Physics at the Ferrara University (supervisor Cristiano Guidorzi). Main research topics: multiwavelength study of Gamma-Ray Bursts (GRBs), Fast Radio Bursts (FRBs), involvement in future astrophysical missions (HXMT, THESEUS). |
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Martone, Renato (Italy) Università degli Studi di Napoli Federico II Bachelor's Degree in Physics at Napoli Federico II University with a thesis about gamma-ray bursts (GRBs). Graduate student enrolled at the Ph.D. programme in Physics at the Ferrara University (supervisor Cristiano Guidorzi). Main research topics: multiwavelength study and data analysis of GRBs and of the transient sky. |
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Vieira Lobato, Ronaldo (Brazil) Instituto Tecnológico de Aeronáutica “I have Licentiate degree in Natural Sciences, habilitation in Physics (2009-2013), Master of Science, with major in Nuclear Physics (2013-2015). I am a PhD student at Technological Institute of Aeronautics (ITA); on February I was granted a scholarship (CAPES Sandwich Fellowship) from March 2017 to February 2018 for internship at the University “Sapienza” of Rome. My research focuses on structure and evolution of compact stars and emission mechanisms. Member of Brazilian Society of Physics (SBF) and American Physical Society (APS)” |
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Zargaryan, Davit (Armenia) National Academy of Sciences of Armenia “I am coming from Yerevan State University and I am PhD student in ICRANet Armenia. My PhD thesis is devoted to study particle acceleration and emission processes in the large scale jets of AGNs.” |