The impact of cosmic neutrinos on the gravitational-wave background

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dc.creatorMangilli, A.
dc.creatorBartolo, N.
dc.creatorMatarrese, S.
dc.creatorRiotto, A.
dc.date2008-05-21
dc.date2008-10-23
dc.date.accessioned2026-07-07T12:44:36Z
dc.date.available2026-07-07T12:44:36Z
dc.descriptionWe obtain the equation governing the evolution of the cosmological gravitational-wave background, accounting for the presence of cosmic neutrinos, up to second order in perturbation theory. In particular, we focus on the epoch during radiation dominance, after neutrino decoupling, when neutrinos yield a relevant contribution to the total energy density and behave as collisionless ultra-relativistic particles. Besides recovering the standard damping effect due to neutrinos, a new source term for gravitational waves is shown to arise from the neutrino anisotropic stress tensor. The importance of such a source term, so far completely disregarded in the literature, is related to the high velocity dispersion of neutrinos in the considered epoch; its computation requires solving the full second-order Boltzmann equation for collisionless neutrinos.
dc.description12 pages, LaTeX file; Phys.Rev.D accepted version
dc.identifierhttps://arxiv.org/abs/0805.3234
dc.identifierhttp://arxiv.org/abs/0805.3234
dc.identifierPhys.Rev.D78:083517,2008
dc.identifierdoi:10.1103/PhysRevD.78.083517
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220824
dc.subjectAstrophysics
dc.titleThe impact of cosmic neutrinos on the gravitational-wave background
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