论文标题
黑暗辐射作为早期宇宙中相变的探针
Dark radiation as a probe for phase transition in the early universe
论文作者
论文摘要
在早期宇宙中，宇宙常数不一定很小。如果标量场在相变（PT）之后获得真空期望值，则可能会在PT之前出现大型宇宙常数。今天的宇宙学常数（ECC）和PT过程可以从今天的黑暗辐射（DR）中检测到，例如在宇宙轴心背景中。我们表明，对于一系列广泛的DR模型，DR密度和频谱通过ECC的存在显着改变。从当今DR的密度和频谱中，我们可以推断出PT的温度和强度。
The cosmological constant is not necessarily small in the early universe. If a scalar field obtains a vacuum expectation value after a phase transition (PT), a possibly large cosmological constant could present before PT. The early cosmological constant (ECC) and the PT process may be detectable from dark radiation (DR) today, such as in the cosmic axion background. We show that for a broad class of DR models, the DR density and spectrum are significantly modified by the presence of an ECC. From the density and the spectrum of the DR today, we can deduce the temperature and the strength of the PT.
