The void abundance with non-gaussian primordial perturbations
- California Institute of Technology, Mail Code 130-33, Pasadena, CA 91125 (United States)
- ICREA and Institute of Space Sciences (CSIC-IEEC), Campus UAB, Bellaterra (Spain)
We use a Press-Schechter-like calculation to study how the abundance of voids changes in models with non-Gaussian initial conditions. While a positive skewness increases the cluster abundance, a negative skewness does the same for the void abundance. We determine the dependence of the void abundance on the non-Gaussianity parameter f{sub nl} for the local-model bispectrum-which approximates the bispectrum in some multi-field inflation models-and for the equilateral bispectrum, which approximates the bispectrum in single-field slow-roll inflation and in string-inspired DBI models of inflation. We show that the void abundance in large-scale-structure surveys currently being considered should probe values as small as f{sub nl} {approx}< 10 and f{sub nl}{sup eq} {approx}< 30, over distance scales {approx} 10 Mpc.
- OSTI ID:
- 22156849
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 01 Vol. 2009; ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mixed non-Gaussianity in multiple-DBI inflation
Trispectrum estimator in equilateral type non-Gaussian models