| Texto completo | |
| Autor(es): |
Bartolo, Nicola
;
Beltran Almeida, Juan P.
;
Matarrese, Sabino
;
Pietroni, Massimo
;
Riotto, Antonio
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Cosmology and Astroparticle Physics; v. N/A, n. 3, p. 25-pg., 2010-03-01. |
| Resumo | |
We apply the time-renormalization group approach to study the effect of primordial non-Gaussianities in the non-linear evolution of cosmological dark matter density perturbations. This method improves the standard perturbation approach by solving renormalization group-like equations governing the dynamics of gravitational instability. The primordial bispectra constructed from the dark matter density contrast and the velocity fields represent initial conditions for the renormalization group flow. We consider local, equilateral and folded shapes for the initial non-Gaussianity and analyze as well the case in which the non-linear parameter f(NL) parametrizing the strength of the non-Gaussianity depends on the momenta in Fourier space through a power-law relation, the so-called running non-Gaussianity. For the local model of non-Gaussianity we compare our findings for the power-spectrum with those of recent N-body simulations and find that they accurately fit the N-body data up to wave-numbers k similar to 0.25 h/Mpc at z = 0. We also present predictions for the (reduced) matter bispectra for the various shapes of non-Gaussianity. (AU) | |
| Processo FAPESP: | 07/58202-7 - Modelos interagentes de energia escura, inflação e holografia |
| Beneficiário: | Juan Pablo Beltrán Almeida |
| Modalidade de apoio: | Bolsas no Exterior - Pesquisa |
| Processo FAPESP: | 06/00622-8 - Teorias de gauge para a gravitação, espaços de Sitter e horizontes cosmológicos |
| Beneficiário: | Juan Pablo Beltrán Almeida |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |