Nonperturbative overproduction of axionlike particles via derivative interactions
Nonperturbative overproduction of axionlike particles via derivative interactions
复制标题
通过导数相互作用非微扰地产生类轴子粒子
DOI：
10.1103/physrevd.93.043502
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发表时间：
2015
影响因子：
5
通讯作者：
S. Qutub
中科院分区：
文献类型：
--
作者：
A. Mazumdar;S. Qutub
类轴子粒子（Axionlike particles，ALP）在标准模型之外的许多物理场景中是相当普遍的。它们是赝标量南武-戈德斯通玻色子，一旦任何全局U（1）对称性自发破缺就会出现。ALP可以从各种非微扰量子效应中获得质量，例如异常或瞬子。ALP可以通过导数相互作用耦合到包括暴胀子或模场等标量凝聚体的物质扇区，这些相互作用被轴子衰变常数fχ抑制。虽然弱相互作用，ALP可以产生大量的均匀凝聚体的相干振荡。在本文中，我们将研究这样一种情况，即ALPs可以大量产生，并且在某些情况下甚至可以通过奇维和偶维算子过接近宇宙，只要fχ/ΦI <$1，其中ΦI表示标量凝聚体的相干振荡的初始振幅，我们将简要地提到这种危险的生产过剩将如何影响宇宙中的暗物质和暗辐射丰度。
Axionlike particles (ALPs) are quite generic in many scenarios for physics beyond the Standard Model. They are pseudoscalar Nambu-Goldstone bosons that appear once any global U(1) symmetry is broken spontaneously. The ALPs can gain mass from various nonperturbative quantum effects, such as anomalies or instantons. ALPs can couple to the matter sector including a scalar condensate such as inflaton or moduli field via derivative interactions, which are suppressed by the axion decay constant, fχ. Although weakly interacting, the ALPs can be produced abundantly from the coherent oscillations of a homogeneous condensate. In this paper we will study such a scenario where the ALPs can be produced abundantly, and in some cases can even overclose the Universe via odd- and even-dimensional operators, as long as fχ/ΦI≪1, where ΦI denotes the initial amplitude of the coherent oscillations of the scalar condensate, ϕ. We will briefly mention how such dangerous overproduction would affect dark matter and dark radiation abundances in the Universe.