论文标题
在辐射主导的宇宙中重新归一化和非绝热真空选择
Renormalization and a non-adiabatic vacuum choice in a radiation-dominated universe
论文作者
论文摘要
真空和颗粒可以在扩展的宇宙的绝热状态下自然定义。但是，通常，除非时空背景具有特殊的对称性，否则没有首选的真空状态选择。在没有对称性的情况下，标准的观点是构建允许应力能量张量重降低的绝热状态。我们研究了一种特殊的非绝热真空吸尘器，用于通过施加早期的保形对称性定义的辐射主导宇宙中的大规模标量场。我们表明，尽管其紫外线行为并不是振荡术语的出现，但这种状态与重新归一致是一致的。
Vacuum and particles can be naturally defined in the adiabatic regime of an expanding universe. In general, however, there is no preferred choice of a vacuum state, unless the spacetime background possesses special symmetries. In the absence of symmetries the standard viewpoint is to construct distinguished adiabatic states permitting renormalizability of the stress-energy tensor. We study a special non-adiabatic vacuum for a massive scalar field in a radiation-dominated universe defined by imposing early-times conformal symmetry. We show that this state is consistent with renormalization, despite its ultraviolet behaviour is not the conventional one due to the emergence of oscillatory terms.
