The current knowledge of cosmological structure formation suggests that Cold Dark Matter (CDM) halos possess a nonspherical density profile, implying that cosmic structures can be potential sources of gravitational waves via power transfer from scalar perturbations to tensor metric modes in the nonlinear regime. By means of a previously developed mathematical formalism and a triaxial collapse model, we numerically estimate the stochastic gravitational-wave background generated by CDM halos during the fully nonlinear stage of their evolution. Our results suggest that the energy density associated with this background is comparable to that produced by primordial tensor modes at frequencies ν≈10−18−10−17Hz if the energy scale of inflation is V1/4≈1−2×1015 GeV, and that these gravitational waves could give rise to several cosmological effects, including secondary CMB anisotropy and polarization.
|Titolo:||The Stochastic Gravitational-Wave Background from Cold Dark Matter Halos|
|Autori:||Carbone, C.; Baccigalupi, C.; Matarrese, S.|
|Titolo del libro:||Relativistic Astrophysics Legacy and Cosmology - Proceedings of the MPE/USM/MPA/ESO Joint Astronomy Conference|
|Data di pubblicazione:||2008|
|Digital Object Identifier (DOI):||10.1007/978-3-540-74713-0_16|
|Appare nelle tipologie:||4.1 Contribution in Conference proceedings|