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arXiv 1504.04366astro-ph.COgr-qchep-th
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等效原理与重子声峰

Equivalence Principle and the Baryon Acoustic Peak

Tobias Baldauf, Mehrdad Mirbabayi, Marko Simonović, Matias Zaldarriaga

摘要:

研究了长波长密度扰动$δ(λ_L)$对短程物理的主导作用。在非相对论极限下,结果是一个均匀加速度,由等效原理固定,并且由于平移不变性,通常对统计平均值没有影响。同样的推理已经被形式化,以获得宇宙学关联函数的“一致性条件”。在存在诸如在$l_{\rm BAO}$处的声学峰值的特征的情况下,这种天真的期望对于$λ_L<l_{\rm BAO}$被打破。我们计算了一个通用的三点关联函数在这一制度。同样的效果示出的基础上的声峰的传播,并且是可计算的所有订单中的长模式。这可以用来改善微扰计算的结果-一种被称为“红外再成像”的技术-并被明确地应用于功率谱的单回路计算。最后,BAO重建方案的成功被认为是另一个经验证据的有效性的结果。

英文摘要:

We study the dominant effect of a long wavelength density perturbation $δ(λ_L)$ on short distance physics. In the non-relativistic limit, the result is a uniform acceleration, fixed by the equivalence principle, and typically has no effect on statistical averages due to translational invariance. This same reasoning has been formalized to obtain a "consistency condition" on the cosmological correlation functions. In the presence of a feature, such as the acoustic peak at $l_{\rm BAO}$, this naive expectation breaks down for $λ_L<l_{\rm BAO}$. We calculate a universal piece of the three-point correlation function in this regime. The same effect is shown to underlie the spread of the acoustic peak, and is calculable to all orders in the long modes. This can be used to improve the result of perturbative calculations - a technique known as "infra-red resummation" - and is explicitly applied to the one-loop calculation of power spectrum. Finally, the success of BAO reconstruction schemes is argued to be another empirical evidence for the validity of the results.

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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