Measuring the cosmological lepton asymmetry through the CMB anisotropy

Details Measuring the cosmological lepton asymmetry through the CMB anisotropy Measuring the cosmological lepton asymmetry through the CMB anisotropy

1999-03-23

arxiv.org/abs/hep-ph/9903459v3

Phys.Rev.Lett. 83 (1999) 3366-3369

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pagex LaTex, 1 color postscript figure, uses epsf. Version submitted to PRL. (Bug in code fixed, new figure, conclusions unc

Scientific paper

10.1103/PhysRevLett.83.3366

A large lepton asymmetry in the Universe is still a viable possibility and leads to many interesting phenomena such as gauge symmetry nonrestoration at high temperature. We show that a large lepton asymmetry changes the predicted cosmic microwave background (CMB) anisotropy and that any degeneracy in the relic neutrino sea will be measured to a precision of 1% or better when the CMB anisotropy is measured at the accuracy expected to result from the planned satellite missions MAP and Planck. In fact, the current measurements already put an upper limit on the lepton asymmetry of the Universe which is stronger than the one coming from considerations of primordial nucleosynthesis and structure formation.

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