4.6 Article

On the IR-resummation in the EFTofLSS

Journal

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2018/05/019

Keywords

baryon acoustic oscillations; power spectrum

Funding

  1. James Arthur Postdoctoral Fellowship
  2. NSF [1720397]
  3. Direct For Mathematical & Physical Scien
  4. Division Of Physics [1720397] Funding Source: National Science Foundation

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We propose a simplification for the IR-resummation scheme of [1] and also include its next-to-leading order corrections coming from the tree-level three-point function of the long displacement field. First we show that the new simplified formula shares the same properties of the resummation of [1]. In Fourier space, the IR-resummed power spectrum has no residual wiggles and the two-loop calculation matches the non-linear power spectrum of the Dark Sky simulation at z = 0 up to k similar or equal to 0.34 h Mpc(-1) within cosmic variance. Then, we find that the additional subleading terms (although parametrically infrared-enhanced) modify the leading-order IR-resummed correlation function only in a marginal way, implying that the IR-resummation scheme can robustly predict the shape of the BAO peak.

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