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arXiv 2108.04246hep-phastro-ph.COgr-qc
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奇异暴胀子势的小宇宙学常数

Small cosmological constant from a peculiar inflaton potential

Wen Yin

摘要:

我们提出了一个新的方案来解释小宇宙学常数(CC)的微调暴胀子潜力。调谐形状在辐射修正下是稳定的,我们的设置在技术上是自然的。特殊势近似满足以下条件:当CC为正时,暴胀是永恒的;当CC为负时,暴胀不是永恒的。通过引入一个从正值到负值的缓慢变化的CC,宇宙在暴胀后的主导体积被证明具有一个消失的小CC。这种情况不需要永恒的通货膨胀,但e折叠数是指数级的,通货膨胀规模应该足够低。该方案可以有一个一致的热历史,但目前的宇宙状态方程被预测不同于ΛCDM模型的预测。研究了一个具有轻标量场的具体模型。

英文摘要:

We propose a novel scenario to explain the small cosmological constant (CC) by a finely tuned inflaton potential. The tuned shape is stable under radiative corrections, and our setup is technically natural. The peculiar po- tential approximately satisfies the following conditions: the inflation is eternal if CC is positive, and not eternal if CC is negative. By introducing a slowly varying CC from a positive value to a negative value, the dominant volume of the Universe after the inflation turns out to have a vanishingly small CC. The scenario does not require eternal inflation but the e-folding number is exponentially large and the inflation scale should be low enough. The scenario can have a consistent thermal history, but the present equation of state of the Universe is predicted to differ from the prediction of the ΛCDM model. A concrete model with a light scalar field is studied.

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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