4.4 Article

A Concept of Assessment of LIV Tests with THESEUS Using the Gamma-Ray Bursts Detected by Fermi/GBM

Journal

UNIVERSE
Volume 9, Issue 8, Pages -

Publisher

MDPI
DOI: 10.3390/universe9080359

Keywords

gamma-ray bursts; GRBs as cosmological probes and test-bench for fundamental physics; GRBs: past, present and future experiments and missions

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According to Einstein's theory of relativity, the speed of light is constant in a vacuum. However, quantum gravity effects may cause dispersion in the speed of light depending on photon energy. Studying the spectral lags between gamma-ray burst (GRB) light curves recorded at different energy ranges can provide insights into this phenomenon, if the speed of light is linearly dependent on photon energy and a function of GRB redshift. We propose a methodology using GRB light curves to investigate the dispersion law of light propagation in a vacuum, with the intention of utilizing GRB data collected by THESEUS.
According to Einstein's special relativity theory, the speed of light in a vacuum is constant for all observers. However, quantum gravity effects could introduce its dispersion depending on the energy of photons. The investigation of the spectral lags between the gamma-ray burst (GRB) light curves recorded in distinct energy ranges could shed light on this phenomenon: the lags could reflect the variation of the speed of light if it is linearlydependent on the photon energy and a function of the GRB redshift. We propose a methodology to start investigating the dispersion law of light propagation in a vacuum using GRB light curves. This technique is intended to be fully exploited using the GRB data collected with THESEUS.

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