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Novel probe of graviton dispersion relations at nanohertz frequencies

Bill Atkins Orcid Logo, Ameek Malhotra Orcid Logo, Gianmassimo Tasinato Orcid Logo

Physical Review D, Volume: 110, Issue: 12, Start page: 124018

Swansea University Authors: Bill Atkins Orcid Logo, Ameek Malhotra Orcid Logo, Gianmassimo Tasinato Orcid Logo

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Abstract

We generalise Phinney’s ‘practical theorem’ to account for modified graviton dispersion relations motivated by certain cosmological scenarios. Focusing on specific examples, we show how such modifications can induce characteristic localised distortions– bumps– in the frequency profile of the stochas...

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Published in: Physical Review D
ISSN: 2470-0010 2470-0029
Published: American Physical Society (APS) 2024
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa68301
Abstract: We generalise Phinney’s ‘practical theorem’ to account for modified graviton dispersion relations motivated by certain cosmological scenarios. Focusing on specific examples, we show how such modifications can induce characteristic localised distortions– bumps– in the frequency profile of the stochastic gravitational wave background emitted from distant binary sources. We concentrate on gravitational waves at nano-Hertz frequencies probed by pulsar timing arrays, and we forecast the capabilities of future experiments to accurately probe parameters controlling modified dispersion relations. Our predictions are based on properties of gravitational waves emitted in the first inspiral phase of the binary process, and do not rely on assumptions of non-linear effects occurring during the binary merging phase.
College: Faculty of Science and Engineering
Funders: We are partially funded by STFC Grant No. ST/X000648/1.
Issue: 12
Start Page: 124018