arXiv 1202.66792012-02hep-phastro-ph.COhep-ex

自发B-L破裂是热早期宇宙的起源

Spontaneous B-L Breaking as the Origin of the Hot Early Universe

Wilfried Buchmüller, Valerie Domcke, Kai Schmitz

备注：: 64 pages, 8 figures, 1 table. v2: minor numerical corrections, slightly different parameter point chosen in section 4, final results unchanged
发表信息：: Nucl.Phys.B862 (2012) 587-632
DOI：: 10.1016/j.nuclphysb.2012.05.001

摘要：

B-L对称性未破缺的假真空的衰变是一种有趣且可检验的机制，可以产生早期热宇宙的初始条件。如果B-L在大统一尺度下被破坏，假真空阶段产生混合暴胀，以快子预热结束。B-L破缺希格斯场的动力学和热过程产生大量的重中微子，它们的衰变产生熵、重子不对称性和引力子暗物质。研究了超对称阿贝尔Higgs模型的相变。对于随后的再加热过程中，我们给出了详细的时间分辨的所有粒子丰度的描述。宇宙膨胀和熵产生的竞争导致了一个中间时期的恒定“再加热”温度，在此期间产生了重子不对称性和暗物质。混合暴胀、稀薄成因和引力子暗物质的一致性暗示了中微子参数和超粒子质量之间的关系。特别是，对于1 TeV的胶子质量，我们发现引力子质量的下限为10 GeV。

英文摘要：

The decay of a false vacuum of unbroken B-L symmetry is an intriguing and testable mechanism to generate the initial conditions of the hot early universe. If B-L is broken at the grand unification scale, the false vacuum phase yields hybrid inflation, ending in tachyonic preheating. The dynamics of the B-L breaking Higgs field and thermal processes produce an abundance of heavy neutrinos whose decays generate entropy, baryon asymmetry and gravitino dark matter. We study the phase transition for the full supersymmetric Abelian Higgs model. For the subsequent reheating process we give a detailed time-resolved description of all particle abundances. The competition of cosmic expansion and entropy production leads to an intermediate period of constant 'reheating' temperature, during which baryon asymmetry and dark matter are produced. Consistency of hybrid inflation, leptogenesis and gravitino dark matter implies relations between neutrino parameters and superparticle masses. In particular, for a gluino mass of 1 TeV, we find a lower bound on the gravitino mass of 10 GeV.

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