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arXiv 2109.05285hep-phastro-ph.COgr-qchep-th
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宇宙学常数弛豫的热微扰

Thermal Perturbations from Cosmological Constant Relaxation

Lingyuan Ji, David E. Kaplan, Surjeet Rajendran, Erwin H. Tanin

摘要:

我们探讨了最近提出的一类解决方案的宇宙学常数问题的宇宙学后果。在这些模型中,宇宙经历了长时间的膨胀,然后是收缩和反弹,为热大爆炸时代奠定了基础。任何成功的早期宇宙模型的一个要求是,它必须重现在CMB尺度下观测到的标度不变密度扰动。虽然这类模型涉及长时间的暴胀,但在观测相关阶段,暴胀的哈勃尺度等于或低于当前的哈勃尺度,使得德西特波动太弱,无法产生CMB各向异性。我们表明,足够强的扰动仍然可以源热,如果作为暴胀的弛豫场与热浴,这可以产生和维持相同的相互作用相互作用。我们提出了一个简单的模型,其中弛豫场是衍生(即技术上自然)耦合到一个非阿贝尔规范部门,得到激发快子,随后热化由于其非线性自相互作用。这个模型解释了小的宇宙学常数和CMB各向异性的幅度。

英文摘要:

We probe the cosmological consequences of a recently proposed class of solutions to the cosmological constant problem. In these models, the universe undergoes a long period of inflation followed by a contraction and a bounce that sets the stage for the hot big bang era. A requirement of any successful early universe model is that it must reproduce the observed scale-invariant density perturbations at CMB scales. While these class of models involve a long period of inflation, the inflationary Hubble scale during their observationally relevant stages is at or below the current Hubble scale, rendering the de Sitter fluctuations too weak to seed the CMB anisotropies. We show that sufficiently strong perturbations can still be sourced thermally if the relaxion field serving as the inflaton interacts with a thermal bath, which can be generated and maintained by the same interaction. We present a simple model where the relaxion field is derivatively (i.e. technically naturally) coupled to a non-abelian gauge sector, which gets excited tachyonically and subsequently thermalizes due to its nonlinear self-interactions. This model explains both the smallness of the cosmological constant and the amplitude of CMB anisotropies.

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