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arXiv 1407.7465hep-phastro-ph.CO
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具有高尺度暴胀的轴子模型

Axion Models with High Scale Inflation

Takeo Moroi, Kyohei Mukaida, Kazunori Nakayama, Masahiro Takimoto

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18 pages, 4 figures
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摘要：

我们重温轴子模型的宇宙学方面。在高尺度暴胀情景中，Peccei-Quinn（PQ）对称性很可能在暴胀期间/之后恢复。如果PQ标量势在原点处的曲率小于其真空期望值，例如在一类SUSY轴子模型中，PQ标量的径向分量（saxion）弛豫到势的全局极小值之前就会发生热膨胀，而saxion相干振荡的衰减会产生过多的轴子暗辐射.本文结合具体例子研究了如何避免轴子暗辐射的产生。我们表明，通过适当地考虑有限温度耗散效应，可以放松过剩生产的约束，因为PQ标量可以再次参加热等离子体，即使在PQ相变。我们还表明，它可以进一步放松，由于另一个沉重的CP-奇标量的后期衰变，如果它是存在的。

英文摘要：

We revisit the cosmological aspects of axion models. In the high-scale inflation scenario, the Peccei-Quinn (PQ) symmetry is likely to be restored during/after inflation. If the curvature of the PQ scalar potential at the origin is smaller than its vacuum expectation value; for instance in a class of SUSY axion models, thermal inflation happens before the radial component of the PQ scalar (saxion) relaxes into the global minimum of the potential and the decay of saxion coherent oscillation would produce too much axion dark radiation. In this paper, we study how to avoid the overproduction of axion dark radiation with some concrete examples. We show that, by taking account of the finite-temperature dissipation effect appropriately, the overproduction constraint can be relaxed since the PQ scalar can take part in the thermal plasma again even after the PQ phase transition. We also show that it can be further relaxed owing to the late time decay of another heavy CP-odd scalar, if it is present.

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