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arXiv 1003.0663hep-thastro-ph.COgr-qc
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各向异性气泡成核的可观测效应

Observable effects of anisotropic bubble nucleation

Jose J. Blanco-Pillado, Michael P. Salem

摘要:

我们的宇宙可能是在永恒膨胀的背景下通过气泡成核形成的。此外,背景可能有一个紧凑的尺寸-在气泡成核过程中,其模量从亚稳最小值中隧穿出来-随后增长成为我们的三个大空间尺寸之一。那么背景的约化对称性就等价于我们的气泡宇宙中的各向异性初始条件。我们计算的暴胀光谱在这样的情况下,作为理解各向异性的影响的第一步,将其投影到球谐函数。由此产生的频谱表现出异常的多极相关性,其相对振幅由本曲率参数,延伸到任意大的多极矩。如果缓慢的通货膨胀在我们的泡沫中不会持续太久,这就增加了未来检测的可能性。对观测信号的充分理解必须考虑背景各向异性对光子自由流的影响,并留给未来的工作。

英文摘要:

Our universe may have formed via bubble nucleation in an eternally-inflating background. Furthermore, the background may have a compact dimension--the modulus of which tunnels out of a metastable minimum during bubble nucleation--which subsequently grows to become one of our three large spatial dimensions. Then the reduced symmetry of the background is equivalent to anisotropic initial conditions in our bubble universe. We compute the inflationary spectrum in such a scenario and, as a first step toward understanding the effects of anisotropy, project it onto spherical harmonics. The resulting spectrum exhibits anomalous multipole correlations, their relative amplitude set by the present curvature parameter, which extend to arbitrarily large multipole moments. This raises the possibility of future detection, if slow-roll inflation does not last too long within our bubble. A full understanding of the observational signal must account for the effects of background anisotropy on photon free streaming, and is left to future work.

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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