Constraints on equivalence principle violation from gamma ray bursts
| Autor: | Pedro G. Ferreira, Harry Desmond, Dexter Bergsdal, Jens Jasche, Deaglan J. Bartlett |
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| Jazyk: | angličtina |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Particle physics Photon Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena Sigma FOS: Physical sciences Context (language use) General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences Shapiro delay Astrophysics - Astrophysics of Galaxies Weak equivalence Galaxy General Relativity and Quantum Cosmology Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Equivalence principle Gamma-ray burst Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Physical Review D. 104(8) |
| ISSN: | 2470-0029 2470-0010 0004-6361 0304-9523 |
| DOI: | 10.1103/physrevd.104.084025 |
| Popis: | Theories of gravity that obey the Weak Equivalence Principle have the same Parametrised Post-Newtonian parameter $\gamma$ for all particles at all energies. The large Shapiro time delays of extragalactic sources allow us to put tight constraints on differences in $\gamma$ between photons of different frequencies from spectral lag data, since a non-zero $\Delta \gamma$ would result in a frequency-dependent arrival time. The majority of previous constraints have assumed that the Shapiro time delay is dominated by a few local massive objects, although this is a poor approximation for distant sources. In this work we consider the cosmological context of these sources by developing a source-by-source, Monte Carlo-based forward model for the Shapiro time delays by combining constrained realisations of the local density field using the Bayesian origin reconstruction from galaxies algorithm with unconstrained large-scale modes. Propagating uncertainties in the density field reconstruction and marginalising over an empirical model describing other contributions to the time delay, we use spectral lag data of Gamma Ray Bursts from the BATSE satellite to constrain $\Delta \gamma < 2.1 \times 10^{-15}$ at $1 \sigma$ confidence between photon energies of $25 {\rm \, keV}$ and $325 {\rm \, keV}$. Comment: 14 pages, 7 figures, 3 tables, accepted for publication in Physical Review D |
| Databáze: | OpenAIRE |
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