arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1904.03318astro-ph.COgr-qc
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具有双曲余弦势的标量场暗物质

Scalar field dark matter with a cosh potential, revisited

L. Arturo Ureña-López

摘要:

组成粒子是超轻玻色子的暗物质模型已经成为宇宙学和天体物理学的主流讨论的一部分。在经典水平上,模型由(实的或复的)标量场的动力学表示,标量场被赋予包含其自相互作用的势,因此通常被称为标量场暗物质模型。在这里,我们重新审视这样一个模型与cosh潜力的属性,并将其与文献中的其他已知的例子进行比较。在宇宙学的背景下,自相互作用的潜力诱导辐射的行为,在早期的标量场密度,这是由一个适当的物质的行为,在周围的最小值的快速场振荡的开始。的解决方案是通过数值方法,并从中我们获得的宇宙学观测的线性密度微扰的水平。我们还研究了自引力物体在非相对论极限下的一般性质,并确定了由cosh势得到的自相互作用在其中的作用。总的结论是,对于不同约束条件所允许的参数范围,双曲余弦势的行为与简单的二次势几乎没有区别,这也意味着这两个模型受到宇宙学和天体物理观测的严格约束。

英文摘要:

Dark matter models in which the constituent particle is an ultra-light boson have become part of the mainstream discussion in cosmology and astrophysics. At the classical level, the models are represented by the dynamics of a (real or complex) scalar field endowed with a potential that contains its self-interactions, and for this reason are generically known as scalar field dark matter models. Here, we revisit the properties of such a model with a cosh potential and compare it with other known examples in the literature. Within the cosmological context, the self-interaction in the potential induces a radiation-like behavior at early times of the scalar field density, which is followed by a proper matter-like behavior at the onset of rapid field oscillations around the minimum of the potential. The solutions are found by numerical means, and from them we obtain information about the cosmological observables up to the level of linear density perturbations. We also study the general properties of self-gravitating objects in the non-relativistic limit and determine the role in them of the self-interaction obtained from the cosh potential. An overall conclusion is that, for the range of values in its parameters allowed by different constraints, a cosh potential behaves almost indistinguishable from the simpler quadratic one, which also means that the two models suffer the same tight constraints from cosmological and astrophysical observations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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