arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1409.7073hep-thastro-ph.COgr-qchep-ph
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“结局”

'The End'

Nemanja Kaloper, Antonio Padilla

摘要:

最近,我们提出了一种机制来隔离标准模型真空能量,该能量预测宇宙将崩溃。在这里,我们提出了一个简单的机制,使这种崩溃,采用标量场的潜力是线性的,并成为负的,提供负的能量密度所需的结束膨胀。势能的斜率被选择为允许膨胀持续到当前的哈勃时间,大约$10^{10}$年,以适应我们的宇宙。至关重要的是,由于移位对称性,这种选择在技术上是自然的。此外,真空能量隔离为坍缩选择{ \it辐射稳定}的初始条件,这保证了在转向之前宇宙由线性势主导,该线性势驱动了至少一个Efold的加速膨胀时期。因此,一个单一的、技术上自然的斜坡选择确保了坍缩即将发生,并在当前宇宙加速阶段之前发生,为“为什么是现在?”提供了一个新的答案。“问题。

英文摘要:

Recently we proposed a mechanism for sequestering the Standard Model vacuum energy that predicts that the universe will collapse. Here we present a simple mechanism for bringing about this collapse, employing a scalar field whose potential is linear and becomes negative, providing the negative energy density required to end the expansion. The slope of the potential is chosen to allow for the expansion to last until the current Hubble time, about $10^{10}$ years, to accommodate our universe. Crucially, this choice is technically natural due to a shift symmetry. Moreover, vacuum energy sequestering selects {\it radiatively stable} initial conditions for the collapse, which guarantee that immediately before the turnaround the universe is dominated by the linear potential which drives an epoch of accelerated expansion for at least an efold. Thus a single, technically natural choice for the slope ensures that the collapse is imminent and is preceded by the current stage of cosmic acceleration, giving a new answer to the 'Why Now?' problem.

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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