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Cosmic transients, Einstein’s Equivalence Principle and dark matter halos.

Authors :
Bertolami, Orfeu
Landim, Ricardo G.
Source :
Physics of the Dark Universe; Sep2018, Vol. 21, p16-20, 5p
Publication Year :
2018

Abstract

Cosmic transients, such as gamma-ray bursts and fast radio bursts, have been used to constrain the Einstein’s Equivalence Principle (EEP) through the parametrized-post-Newtonian (PPN) formalism. In this approach, the time delay of photons with different energies from these cosmic transients are used to obtain upper bounds on the difference of the PPN γ parameter. In this work we assume that an important contribution to the time delay is due to the dark matter halo of the Milky Way and consider the dark matter mass distribution given by the Navarro–Frenk–White profile. We obtain the upper limit on the difference of the PPN parameter γ for the polarized gamma-ray emission of GRB 110721A, Δ γ < 1 . 06 × 1 0 − 28 , the most stringent limit to date on the EEP. In addition, we show that a very similar upper bound is obtained if, instead of having a dark matter component, a visible matter density profile and a non-minimal gravitational coupling between curvature and matter are present. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
22126864
Volume :
21
Database :
Supplemental Index
Journal :
Physics of the Dark Universe
Publication Type :
Academic Journal
Accession number :
131294658
Full Text :
https://doi.org/10.1016/j.dark.2018.05.002