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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:2108.11526 (astro-ph)
[Submitted on 26 Aug 2021 (v1), last revised 31 Aug 2021 (this version, v2)]

Title:Gravitational Wave Distances in Horndeski Cosmology

Authors:Eric V. Linder
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Abstract:Gravitational wave propagation encounters a spacetime friction from a running Planck mass in modified gravity, causing the luminosity distance to deviate from that in general relativity (or given by the photon luminosity distance to the source), thus making it a valuable cosmological probe. We present the exact expression for the cosmological distance deviation in Horndeski gravity including theories that have a $G_5$ term yet propagate at the speed of light. An especially simple result ensues for coupled Gauss-Bonnet gravity, which we use to show it does not give a viable cosmology. We also generalize such coupling, and review the important connection of gravitational wave cosmological distance deviations to growth of cosmic structure measured by redshift space distortions.
Comments: 5 pages; v2 typos corrected
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc)
Cite as: arXiv:2108.11526 [astro-ph.CO]
  (or arXiv:2108.11526v2 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.2108.11526

Submission history

From: Eric Linder [view email]
[v1] Thu, 26 Aug 2021 00:33:51 UTC (10 KB)
[v2] Tue, 31 Aug 2021 14:52:22 UTC (10 KB)
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