Massive scalar field evolution in de Sitter
Massive scalar field evolution in de Sitter
复制标题
德西特的大规模标量场演化
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
A. Rajantie
中科院分区：
文献类型：
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作者：
T. Markkanen;A. Rajantie
本文通过求解任意初态下的场演化，研究了有质量、非相互作用、非最小耦合量子化标量场在扩展de Sitter背景中的行为。在这种方法中，不需要为了提供粒子态的定义而选择真空，也不需要引入显式的紫外正则化。我们的结论是扩展的de Sitter空间是一个稳定的平衡配置下的初始条件的小扰动。根据初始状态，能量密度可以从上面或下面接近其渐近值，后者意味着违反弱能量条件。因此，量子修正的反作用也可以在非相互作用的大质量情况下导致超加速阶段。
A bstractThe behaviour of a massive, non-interacting and non-minimally coupled quantised scalar field in an expanding de Sitter background is investigated by solving the field evolution for an arbitrary initial state. In this approach there is no need to choose a vacuum in order to provide a definition for particle states, nor to introduce an explicit ultraviolet regularization. We conclude that the expanding de Sitter space is a stable equilibrium configuration under small perturbations of the initial conditions. Depending on the initial state, the energy density can approach its asymptotic value from above or below, the latter of which implies a violation of the weak energy condition. The backreaction of the quantum corrections can therefore lead to a phase of super-acceleration also in the non-interacting massive case.