Charla CAPA. Tomislav Terzić (Department of Physics, University of Rijeka, Croatia)

Measuring Lorentz invariance violation with Cherenkov
telescopes - from observations to setting constraints

Tomislav Terzić (Department of Physics, University of Rijeka, Croatia) works on
astrophysics, astroparticle, physics, cosmology and high energy physics

Abstract: Cherenkov telescopes are instruments optimized for detection of very high energy
(VHE, E > 100 GeV) gamma rays from astrophysics sources. They play a crucial role in testing
possible consequences of Quantum Gravity (QG), such as violation or deformation of Lorentz
symmetry. In both cases, the photon dispersion relation is modified, making the photon group
velocity energy dependent, and possibly modifying kinematics and dynamics of
electromagnetic interactions. These tiny effects are vastly below the sensitivity of present-day
laboratories. However, if real, they could be measured using VHE gamma rays of astrophysical
origin. Cosmological distances that they cross serve as a natural amplifier for the QG effects.
While no deviations from the special relativistic predictions have been detected, strong
constraints have been set on modified photon dispersion relations.
In this session we will explain the process of testing implications of modified photon
dispersion relations on VHE gamma rays using Cherenkov telescopes. We will cover different
stages from observations, Cherenkov telescopes’ data analysis, statistical methods employed,
and finally setting constraints on the QG energy scale.

Jueves 12 mayo, 12 horas, seminario de Física Nuclear