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arXiv 2107.04045astro-ph.COhep-ph
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对称暴胀势的非对称再加热

Asymmetric reheating from a symmetric inflationary potential

James M. Cline, Jean-Samuel Roux

摘要:

我们探讨了一个模型的两个领域的通货膨胀与非最小的动力学条款,其中两个相同的物质部门相互解耦可能会重新加热到不同的温度,同时保持对称性的拉格朗日。这种情况是由镜像暗物质模型的动机,在该模型中,镜像扇区的温度被大爆炸核合成和宇宙微波背景约束为$T'\lesssim0.5 T$。对于一个给定的类的非最小的运动学项,我们发现,对称场轨迹$X=Y$是一个排斥的解决方案,这样,任何随机发生的不对称性在初始条件下放大了许多数量级的通货膨胀期间,远远超出了规范的幂律模型可以实现。在这个模型中,等曲率波动被强烈抑制,但在不久的将来可以观察到一个$\mathcal O(0.03$ -$0.07$)张量标量比。与{ \it普朗克}约束兼容的潜在参数的范围被证明是远远大于相应的单场模型。这是通过一种降低光谱指数的机制发生的,我们称之为CTHC:地平线交叉处的弯曲轨迹。

英文摘要:

We explore a model of two-field inflation with nonminimal kinetic terms in which two identical matter sectors decoupled from each other may reheat to different temperatures while preserving the symmetry of the Lagrangian. This scenario is motivated by mirror dark matter models in which the temperature of the mirror sector is constrained to be $T'\lesssim0.5 T$ by big bang nucleosynthesis and the cosmic microwave background. For a given class of nonminimal kinematic terms, we find that the symmetric field trajectory $X=Y$ is a repeller solution, such that any randomly-occurring asymmetry in the initial conditions is amplified by many orders of magnitude during inflation, far beyond what canonical power-law models can achieve. Isocurvature fluctuations are strongly suppressed in this model, but a $\mathcal O(0.03$--$0.07$) tensor-to-scalar ratio could be observed in the near future. The range of potential parameters compatible with {\it Planck} constraints is shown to be much larger than in corresponding single-field models. This occurs through a mechanism for lowering the spectral index that we dub CTHC: curved trajectory at horizon crossing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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