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Comparing the luminosity distance for gravitational waves and electromagnetic signals in a simple model of quadratic gravity

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arxiv 2010.06569 v2 pith:NVEFWA42 submitted 2020-10-13 gr-qc astro-ph.COhep-th

classification gr-qcastro-ph.COhep-th
keywords distanceluminositycontextdifferenceselectromagneticgravitationalgravitymodified
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We compute the modified friction coefficient controlling the propagation of tensor metric perturbations in the context of a generalized cosmological scenario based on a theory of gravity with quadratic curvature corrections. In such a context we discuss the differences between gravitational and electromagnetic luminosity distance, as well as the differences with the standard results based on the Einstein equations. We present numerical estimates of the modified luminosity distance on the cosmic redshift scale typical of Supernovae and standard sirens.

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  1. Viscosity in Isotropic Cosmological Backgrounds in General Relativity and Starobinsky Gravity

    gr-qc 2025-06 conditional novelty 6.0 of 10

    Shear viscosity does not affect the background expansion or the electromagnetic luminosity distance in isotropic cosmologies with a comoving fluid, also in Starobinsky gravity.

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