English

Consistency relations for large scale structures with primordial non-Gaussianities

Cosmology and Nongalactic Astrophysics 2018-01-22 v2

Abstract

We investigate how the consistency relations of large-scale structures are modified when the initial density field is not Gaussian. We consider both scenarios where the primordial density field can be written as a nonlinear functional of a Gaussian field and more general scenarios where the probability distribution of the primordial density field can be expanded around the Gaussian distribution, up to all orders over δL0\delta_{L0}. Working at linear order over the non-Gaussianity parameters fNL(n)f_{\rm NL}^{(n)} or SnS_n, we find that the consistency relations for the matter density fields are modified as they include additional contributions that involve all-order mixed linear-nonlinear correlations δLδ\langle \prod \delta_L \prod \delta \rangle. We derive the conditions needed to recover the simple Gaussian form of the consistency relations. This corresponds to scenarios that become Gaussian in the squeezed limit. Our results also apply to biased tracers, and velocity or momentum cross-correlations.

Keywords

Cite

@article{arxiv.1610.00993,
  title  = {Consistency relations for large scale structures with primordial non-Gaussianities},
  author = {Patrick Valageas and Atsushi Taruya and Takahiro Nishimichi},
  journal= {arXiv preprint arXiv:1610.00993},
  year   = {2018}
}

Comments

13 pages

R2 v1 2026-06-22T16:10:08.033Z