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ICRANet Newsletter
February 2017 – March 2017
SUMMARY
1. A further success of the ICRANetCAPES program: two new PhD thesis discussions by Gabriel Guimarães Carvalho and Iarley Pereira Lobo also joining collaboration with ICRANetCAPES postdoc 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 ICRANetCAPES program: two new PhD thesis discussions by Gabriel Guimarães Carvalho and Iarley Pereira Lobo also joining collaboration with ICRANetCAPES postdoc 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 ICRANetCAPES program. Their work, in collaboration with ICRANetCAPES postdoc 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)
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, CoAdvisor 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 scalartensor 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 selfforce effects on a scalar charge orbiting a ReissnerNordström black hole are investigated. The scalar wave equation is solved analytically in a postNewtonian framework, and the solution is used to compute the selffield as well as the components of the selfforce at the location of the particle up to 7.5 postNewtonian 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 strongfield and weakfield 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 coadivsor 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 selfforce effects from the Schwarzschild background to the ReissnerNordstrom one. The application has been performed here at the simplest level of scalar selfforce 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 ReissnerNordstrom 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 selfforce effects on a particle orbiting a ReissnerNordström 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 CAPESICRANet program. For more information please see the thesis and the video of thesis discussion. Iarley Pereira Lobo presented a thesis “Geometrical approach to Planckscale 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 AmelinoCamelia. In this thesis some semiclassical properties of Quantum Gravity are described by the use of nontrivial 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 antide 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 antide 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 welldefined 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 AmelinoCamelia 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 quantumgravity 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 momentumspace 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 gammarayburst 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, Spacetime 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 Planckscaledeformed coproducts, Int. J. Mod. Phys. Conf. Ser. 41 1660126 (2016). 5. I. P. Lobo, G. Palmisano and G. AmelinoCamelia, Geometric picture of DSRrelativisitc theories with de Sitter and antide 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 BransDicke 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 Planckscaledeformed 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 CAPESICRANet 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 coauthored 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 CAPESICRANet 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 Cmetric, 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 Friedmannlike metric with nonnull 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.
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 “schoolwork”. 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.
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 effectiveonebody (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 semianalytical 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 twobody problem in GR” at the Physics Department, University of Rome La Sapienza.
Prof. Blanchet is one of the leading theoreticians working on PostNewtonian (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 twobody problem in general relativity play a very important role when deciphering and interpreting the gravitational wave signals. In particular, stateoftheart 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 postNewtonian (PN) approximation which describes both the dynamics of two compact bodies (including black holes) and the gravitational radiation emitted."
8. Upcoming international meetings
ICRANetMinsk workshop on high energy astrophysics
National Academy of Sciences of Belarus, Minsk, Belarus, April 2628, 2017 ICRANetMinsk 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 15th19th, 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 IRAPPhD 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 AmelinoCamelia, 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, JeanMarc Gambaudo, Paolo Giommi, Luis Herrera Cometta, Yipeng Jing, Hagen Kleinert, Michael Kramer, Jutta KunzDrolshagen, 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 GalileoXu 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 ItalianKorean 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/ICGACIK
9. New students of the IRAP Ph.D programe
