arXiv 2103.056462021-03hep-phhep-th

Randall-Sundrum模型中的可避免解约束

Avoided Deconfinement in Randall-Sundrum Models

Prateek Agrawal, Michael Nee

备注：: 22 pages, 5 figures, journal version
DOI：: 10.1007/JHEP10(2021)105

摘要：

本文研究了在大$N$规范理论中与禁闭对偶的早期宇宙中Randall-Sundrum模型的一级相变。向受限相的转变速率受到因子$\exp(-N^2)$的抑制，并且对于$N \gg 1$可能不完全，而是导致永久膨胀相。为了避免这一命运，对$N$的最终约束使得RS有效场论仅处于边缘控制之下。我们提出了一种机制，其中的IR膜保持稳定在非常高的温度，使理论停留在封闭的阶段，在所有的时间后，膨胀和重新加热。我们称这种机制为避免解除禁闭。该机制涉及到在红外膜上增加新的标量场，它在有限温度下提供对放射子势的稳定贡献，其精神类似于温伯格的对称性非恢复机制。避免去封闭允许一个可行的宇宙学的理论与参数大$N$。早期的宇宙学现象，如弱相互作用冻结，轴子丰度，重子生成，相变，和引力波签名定性修改。

英文摘要：

We study first order phase transitions in Randall-Sundrum models in the early universe dual to confinement in large-$N$ gauge theories. The transition rate to the confined phase is suppressed by a factor $\exp(-N^2)$, and may not complete for $N \gg 1$, instead leading to an eternally inflating phase. To avoid this fate, the resulting constraint on $N$ makes the RS effective field theory only marginally under control. We present a mechanism where the IR brane remains stabilized at very high temperature, so that the theory stays in the confined phase at all times after inflation and reheating. We call this mechanism avoided deconfinement. The mechanism involves adding new scalar fields on the IR brane which provide a stablilizing contribution to the radion potential at finite temperature, in a spirit similar to Weinberg's symmetry non-restoration mechanism. Avoided deconfinement allows for a viable cosmology for theories with parametrically large $N$. Early universe cosmological phenomena such as WIMP freeze-out, axion abundance, baryogenesis, phase transitions, and gravitational wave signatures are qualitatively modified.

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