Lepton asymmetry in the primordial gravitational wave spectrum

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dc.creatorIchiki, Kiyotomo
dc.creatorYamaguchi, Masahide
dc.creatorYokoyama, Jun'Ichi
dc.date2006-11-09
dc.date.accessioned2026-07-07T10:42:13Z
dc.date.available2026-07-07T10:42:13Z
dc.descriptionEffects of neutrino free streaming is evaluated on the primordial spectrum of gravitational radiation taking both neutrino chemical potential and masses into account. The former or the lepton asymmetry induces two competitive effects, namely, to increase anisotropic pressure, which damps the gravitational wave more, and to delay the matter-radiation equality time, which reduces the damping. The latter effect is more prominent and a large lepton asymmetry would reduce the damping. We may thereby be able to measure the magnitude of lepton asymmetry from the primordial gravitational wave spectrum.
dc.description14 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0611121
dc.identifierhttp://arxiv.org/abs/hep-ph/0611121
dc.identifierPhys.Rev.D75:084017,2007
dc.identifierdoi:10.1103/PhysRevD.75.084017
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181868
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.titleLepton asymmetry in the primordial gravitational wave spectrum
dc.typetext

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