Generation of Cosmic Magnetic Fields and Gravitational Waves at Neutrino Decoupling

Details Generation of Cosmic Magnetic Fields and Gravitational Waves at Neutrino Decoupling Generation of Cosmic Magnetic Fields and Gravitational Waves at Neutrino Decoupling

2001-06-08

arxiv.org/abs/astro-ph/0106154v2

Phys.Rev.Lett. 88 (2002) 011301

Astronomy and Astrophysics

Astrophysics

5 Pages, RevTeX - 2 encapsulated postscript figures; final version accepted for pubblication in PRL

Scientific paper

10.1103/PhysRevLett.88.011301

We show that an inhomogeneous cosmological lepton number may have produced turbulence in the primordial plasma when neutrinos entered (almost) free-streaming regime. This effect may be responsible for the origin of cosmic magnetic fields and give rise to a detectable background of gravitational waves. An existence of inhomogeneous lepton asymmetry could be naturally generated by active-sterile neutrino oscillations or by some versions of Affleck and Dine baryogenesis scenario.

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