Lepton asymmetry in the primordial gravitational wave spectrum

Details Lepton asymmetry in the primordial gravitational wave spectrum Lepton asymmetry in the primordial gravitational wave spectrum

2006-11-09

arxiv.org/abs/hep-ph/0611121v1

Phys.Rev.D75:084017,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 5 figures

Scientific paper

10.1103/PhysRevD.75.084017

Effects 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.

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