Oscillons of axion-like particle: mass distribution and power spectrum
Oscillons of axion-like particle: mass distribution and power spectrum
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DOI：
10.1088/1475-7516/2021/01/061
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发表时间：
2020-10
影响因子：
6.4
通讯作者：
M. Kawasaki;Wakutaka Nakano;Hiromasa Nakatsuka;Eisuke Sonomoto
中科院分区：
文献类型：
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作者：
M. Kawasaki;Wakutaka Nakano;Hiromasa Nakatsuka;Eisuke Sonomoto
在弦理论中，许多类轴子粒子（ALPs）在一个巨大的质量范围内同时存在，并且在暴胀的背景下发展了各种各样的势。在这种电位浅于二次的情况下，突出的不稳定性可以产生局部密集的物体，振荡。由于它们的绝热不变量的近似守恒，振荡子通常存在相当长的时间，在m ~ 10−22 eV的超轻ALPs的情况下，可能会持续到宇宙的当前年龄。这样的振荡可以对近代宇宙的演化产生重大影响。本文通过经典晶格模拟研究了纯自然型势的振子，探讨了现象学应用所需的关键量：振子的数量密度、振子的质量分布、振子与ALP场的能量比以及功率谱。然后，我们根据解析衰减率对这些值进行演化。
In string theory, the simultaneous existence of many Axion-Like Particles (ALPs) are suggested over a vast mass range, and a variety of potentials have been developed in the context of inflation. In such potentials shallower than quadratic, the prominent instability can produce localized dense objects, oscillons. Because of the approximate conservation of their adiabatic invariant, oscillons generally survive quite long, maybe up to the current age of the universe in the case of ultra-light ALPs with m ∼ 10−22 eV. Such oscillons can have significant effects on the evolution of the recent universe. In this paper, we investigate the oscillons of the pure-natural type potential by classical lattice simulation to explore the key quantities necessary for phenomenological application: the number density of oscillons, the oscillon mass distribution, the energy ratio of oscillons to the ALP field, and the power spectrum. Then, we evolve these values in consideration of the analytic decay rate.