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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:2108.12123 (astro-ph)
[Submitted on 27 Aug 2021 (v1), last revised 13 Oct 2021 (this version, v2)]

Title:Generalized local ansatz for scale-dependent primordial non-Gaussianities and future galaxy surveys

Authors:Daisuke Yamauchi, Shuichiro Yokoyama, Tomo Takahashi
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Abstract:We revisit a possible scale-dependence of local-type primordial non-Gaussianities induced by super-horizon evolution of scalar field perturbations. We develop the formulation based on $\delta N$ formalism and derive the generalized form of the local-type bispectrum and also trispectrum which allows us to implement the scale-dependence and suitably compare model prediction with observational data. We propose simple but phenomenologically meaningful expressions, which encompass the information of a wide range of physically motivated models. We also formulate large-scale power spectrum and bispectrum of biased objects in the presence of the scale-dependent primordial non-Gaussianities. We perform the Fisher analysis for future galaxy surveys and give the projected constraints on the parameters of the generalized local-form of primordial non-Gaussianities.
Comments: 29 pages, 1 figure, accepted for publication in PASJ
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc)
Cite as: arXiv:2108.12123 [astro-ph.CO]
  (or arXiv:2108.12123v2 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.2108.12123
Related DOI: https://doi.org/10.1093/pasj/psab108

Submission history

From: Daisuke Yamauchi [view email]
[v1] Fri, 27 Aug 2021 05:30:07 UTC (204 KB)
[v2] Wed, 13 Oct 2021 08:24:50 UTC (243 KB)
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