| Weekly Seminars for July 2013 |
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Thuersday July 4,
2013 - 4,00 pm
Aula C (Dept. of Mathematics & Physics, Univertsity of ROMA 3 - Via della Vasca Navale n° 64)
Seminar of Astrophysics
Speaker:Dr. Henric Krawczynski
Institution: Washington University in St. Louis, USA Title: Tests of Lorentz Invariance Violations with Gamma-ray Observations of Cosmic Sources.
Abstract:
It is well known that the description of nature with the standard model of particle physics and general relativity is incomplete. Quite possibly, the models are only the low-energy limit of a unified theory of quantum gravity that holds at center of momentum energies close to the Planck energy.
In this talk, I discuss quantitative constraints on Lorentz Invariance violating extensions of the standard model derived from X-ray and gamma-ray observations of Active Galactic Nuclei (AGNs) and Gamma-Ray Bursts (GRBs). The analysis is based on the theoretical framework developed by Colladay & Kosteleck? (1997) and Kosteleck? and Mewes (2009). After presenting limits derived from time of flight measurements with the Fermi LAT, H.E.S.S., and VERITAS gamma-ray telescopes, I discuss the sensitivity of similar studies performed with hard X-ray and gamma-ray polarimeters.
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La Segreteria ICRA
c/o Dipartimento di Fisica
Sapienza Università di Roma
P.le A. Moro, 5 I - 00185 ROMA, Italy tel.: +39 06 4991 4 254 fax: +39 06 4454992 email: segreteria@icra.it |