Curvature Perturbation and Domain Wall Formation with Pseudo Scaling Scalar Dynamics
Curvature Perturbation and Domain Wall Formation with Pseudo Scaling Scalar Dynamics
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具有伪标度标量动力学的曲率扰动和畴壁形成
DOI：
10.1088/1475-7516/2016/02/067
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
M.Takimoto
中科院分区：
文献类型：
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作者：
Y.Ema;K.Nakayama;M.Takimoto
本文重新讨论了具有单项式势的标量场在一般背景状态方程下的宇宙动力学。当n小于某一临界值时，标量场呈现相干振荡;当n大于某一临界值时，标量场服从无振荡的标度解。我们详细研究了当n等于临界值时的情形，发现了一个既不是振荡解也不是标度解的标量动力学，我们称之为伪标度解。我们还讨论了赝标度标量动力学的宇宙学意义，如曲率微扰和畴壁问题。
Cosmological dynamics of scalar field with a monomial potential ϕ n with a general background equation of state is revisited. It is known that if n is smaller than a critical value, the scalar field exhibits a coherent oscillation and if n is larger it obeys a scaling solution without oscillation. We study in detail the case where n is equal to the critical value, and find a peculiar scalar dynamics which is neither oscillating nor scaling solution, and we call it a pseudo scaling solution. We also discuss cosmological implications of a pseudo scaling scalar dynamics, such as the curvature perturbation and the domain wall problem.