Starting inflation from inhomogeneous initial conditions with momentum
Starting inflation from inhomogeneous initial conditions with momentum
复制标题
从具有动量的非均匀初始条件开始通货膨胀
DOI:
10.1088/1475-7516/2023/10/046
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发表时间:
2022
影响因子:
6.4
通讯作者:
W. East
中科院分区:
文献类型:
--
作者:
Maxence Corman;W. East
We investigate the circumstances under which cosmic inflation can arise from very inhomogeneous initial conditions using numerical relativity simulations. Previous studies have not considered cases with non-zero momentum density due to technical challenges with solving the coupled Einstein constraint equations. Here we address these, introducing and comparing several different ways of constructing cosmological initial conditions with inhomogeneous scalar field and time derivative profiles. We evolve such initial conditions with large inhomogeneities in both single- and two-field inflationary models. We study cases where the initial gradient and kinetic energy are much larger than the inflationary energy scale, and black holes can form, as well as cases where the initial scalar potential energy is comparable, as in scenarios where inflation occurs at nearly Planckian densities, finding large-field inflation to be generally robust. We consider examples of initial conditions where a large scalar field velocity towards non-inflationary values would prevent inflation from occurring in the homogeneous case, finding that the addition of large gradients in the scalar field can actually dilute this effect, with the increased expansion and non-vanishing restoring force leading to inflation.
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影响因子:
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通讯作者:
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