Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-22
Phys.Rev. D73 (2006) 063503
Astronomy and Astrophysics
Astrophysics
LaTeX file, 9 pages, 4 figures, typos corrected, two figures changed and comments added, matches published version
Scientific paper
10.1103/PhysRevD.73.063503
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 $\nu\approx10^{-18}-10^{-17}$Hz if the energy scale of inflation is $V^{1/4}\approx 1-2\times 10^{15}$ GeV, and that these gravitational waves could give rise to several cosmological effects, including secondary CMB anisotropy and polarization.
Baccigalupi Carlo
Carbone Carmelita
Matarrese Sabino
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