### Abstract

We consider gravitational clustering from primordial non-Gaussian fluctuations provided by a χ^{2} model, as motivated by some models of inflation. The emphasis is on signatures that can be used to constrain this type of model from large-scale structure galaxy surveys. Non-Gaussian initial conditions provide additional nonlinear couplings otherwise forbidden by symmetry that cause nonlinear gravitational corrections to become important at larger scales than in the Gaussian case. In fact, the lack of hierarchical scaling in the initial conditions is partially restored by gravitational evolution at scales k > 0.1 h Mpc^{-1}. However, the bispectrum shows much larger amplitude and residual scale dependence not present in evolution from Gaussian initial conditions, which can be used to test this model against observations. We include the effects of biasing and redshift distortions essential to compare this model with galaxy redshift surveys. We also discuss the effects of primordial non-Gaussianity on the redshift-space power spectrum and show that it changes the shape of the quadrupole to monopole ratio through nonlinear corrections to infall velocities.

Original language | English (US) |
---|---|

Pages (from-to) | 1-8 |

Number of pages | 8 |

Journal | Astrophysical Journal |

Volume | 542 |

Issue number | 1 PART 1 |

State | Published - Oct 10 2000 |

### Fingerprint

### Keywords

- Cosmology: theory
- Large-scale structure of universe

### ASJC Scopus subject areas

- Space and Planetary Science

### Cite this

*Astrophysical Journal*,

*542*(1 PART 1), 1-8.

**Gravitational clustering from χ2 initial conditions.** / Scoccimarro, Román.

Research output: Contribution to journal › Article

*Astrophysical Journal*, vol. 542, no. 1 PART 1, pp. 1-8.

}

TY - JOUR

T1 - Gravitational clustering from χ2 initial conditions

AU - Scoccimarro, Román

PY - 2000/10/10

Y1 - 2000/10/10

N2 - We consider gravitational clustering from primordial non-Gaussian fluctuations provided by a χ2 model, as motivated by some models of inflation. The emphasis is on signatures that can be used to constrain this type of model from large-scale structure galaxy surveys. Non-Gaussian initial conditions provide additional nonlinear couplings otherwise forbidden by symmetry that cause nonlinear gravitational corrections to become important at larger scales than in the Gaussian case. In fact, the lack of hierarchical scaling in the initial conditions is partially restored by gravitational evolution at scales k > 0.1 h Mpc-1. However, the bispectrum shows much larger amplitude and residual scale dependence not present in evolution from Gaussian initial conditions, which can be used to test this model against observations. We include the effects of biasing and redshift distortions essential to compare this model with galaxy redshift surveys. We also discuss the effects of primordial non-Gaussianity on the redshift-space power spectrum and show that it changes the shape of the quadrupole to monopole ratio through nonlinear corrections to infall velocities.

AB - We consider gravitational clustering from primordial non-Gaussian fluctuations provided by a χ2 model, as motivated by some models of inflation. The emphasis is on signatures that can be used to constrain this type of model from large-scale structure galaxy surveys. Non-Gaussian initial conditions provide additional nonlinear couplings otherwise forbidden by symmetry that cause nonlinear gravitational corrections to become important at larger scales than in the Gaussian case. In fact, the lack of hierarchical scaling in the initial conditions is partially restored by gravitational evolution at scales k > 0.1 h Mpc-1. However, the bispectrum shows much larger amplitude and residual scale dependence not present in evolution from Gaussian initial conditions, which can be used to test this model against observations. We include the effects of biasing and redshift distortions essential to compare this model with galaxy redshift surveys. We also discuss the effects of primordial non-Gaussianity on the redshift-space power spectrum and show that it changes the shape of the quadrupole to monopole ratio through nonlinear corrections to infall velocities.

KW - Cosmology: theory

KW - Large-scale structure of universe

UR - http://www.scopus.com/inward/record.url?scp=0034633468&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034633468&partnerID=8YFLogxK

M3 - Article

VL - 542

SP - 1

EP - 8

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 PART 1

ER -