arXiv 1805.045432018-05hep-ph

暴胀后的希格斯弛豫

Higgs relaxation after inflation

Nayara Fonseca, Enrico Morgante, Geraldine Servant

备注：: 51 pages, 16 figures. v3: Minor revisions, version published in JHEP
DOI：: 10.1007/JHEP10(2018)020

摘要：

我们证明了电弱尺度的宇宙学弛豫机制可以独立于暴胀机制而发生，从而减轻了最初的弛豫假设的负担。在宇宙学演化过程中，最终阻止（快速滚动的）弛豫场的是质量由希格斯真空期望值控制的粒子的产生。我们首先表明，希格斯粒子的生产不为此目的工作，因为希格斯场不跟踪其潜力的最小值，希格斯粒子通过耦合到弛豫得到有效的生产。然后，我们专注于规范玻色子的生产。我们提供了一个详细的扫描和停止机制的分析，并确定的参数空间的弛豫机制可以发生膨胀后，同时与宇宙学的约束，如弛豫暗物质过剩和大爆炸核合成兼容。我们发现，截止尺度可以高达200 TeV。在这种方法中，弛豫扇区负责重新加热可见扇区。周期势的阻挡势垒很大，且与希格斯粒子无关，有利于模型的建立。允许的弛豫质量范围从200 MeV到弱标度。在这种情况下，弛豫场偏移是次普朗克的，因此比最初的弛豫方案小了许多数量级。

英文摘要：

We show that the mechanism of cosmological relaxation of the electroweak scale can take place independently of the inflation mechanism, thus relieving burdens from the original relaxion proposal. What eventually stops the (fast-rolling) relaxion field during its cosmological evolution is the production of particles whose mass is controlled by the Higgs vacuum expectation value. We first show that Higgs particle production does not work for that purpose as the Higgs field does not track the minimum of its potential in the regime where Higgs particles get efficiently produced through their coupling to the relaxion. We then focus on gauge boson production. We provide a detailed analysis of the scanning and stopping mechanism and determine the parameter space for which the relaxion mechanism can take place after inflation, while being compatible with cosmological constraints, such as the relaxion dark matter overabundance and Big Bang Nucleosynthesis. We find that the cutoff scale can be as high as two hundreds of TeV. In this approach, the relaxion sector is responsible for reheating the visible sector. The stopping barriers of the periodic potential are large and Higgs-independent, facilitating model-building. The allowed relaxion mass ranges from 200 MeV up to the weak scale. In this scenario, the relaxion field excursion is subplanckian, and is thus many orders of magnitude smaller than in the original relaxion proposal.

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