arXiv 1503.089082015-03-31hep-phastro-ph.COhep-th

膨胀后轴子弛豫过程中的轻子生成

Leptogenesis during Axion Relaxation after Inflation

Kai Schmitz

备注：: 5 pages, 4 figures. Prepared for the proceedings of the 2nd Toyama International Workshop on Higgs as a Probe of New Physics (HPNP 2015), February 11-15, 2015

摘要：

在这次演讲中，我提出了一个新的和最小的替代热leptogenesis，这是建立在假设的电弱规范玻色子耦合到一个类轴子的标量场，因为它是，例如，在某些弦紧化的情况下。这种类轴子场在暴胀结束后的运动产生了轻子和反轻子的有效化学势，在存在由重马约拉纳中微子介导的轻子数违反散射的情况下，这为通过轻生的重子生成提供了机会。在热leptogenesis相反，最终的重子不对称性原来是不敏感的质量和CP违反阶段的重中微子部门。此外，提出的方案需要至少O（10^12）GeV的再加热温度，特别是与接近大统一尺度的重中微子质量相一致。本演讲于2015年2月在富山大学HPNP 2015上发表，基于与A. Kusenko和T. T.柳田

英文摘要：

In this talk, I present a novel and minimal alternative to thermal leptogenesis, which builds upon the assumption that the electroweak gauge bosons are coupled to an axion-like scalar field, as it is, for instance, the case in certain string compactifications. The motion of this axion-like field after the end of inflation generates an effective chemical potential for leptons and antileptons, which, in the presence of lepton number-violating scatterings mediated by heavy Majorana neutrinos, provides an opportunity for baryogenesis via leptogenesis. In contrast to thermal leptogenesis, the final baryon asymmetry turns out to be insensitive to the masses and CP-violating phases in the heavy neutrino sector. Moreover, the proposed scenario requires a reheating temperature of at least O(10^12) GeV and it is, in particular, consistent with heavy neutrino masses close the scale of grand unification. This talk was given in February 2015 at HPNP 2015 at Toyama University and is based on recent work (arXiv:1412.2043 [hep-ph]) in collaboration with A. Kusenko and T. T. Yanagida.

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