Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-07-29
Phys.Rev. D71 (2005) 043508
Astronomy and Astrophysics
Astrophysics
LaTeX file, 13 pages, typos corrected, improved calculations, new section added, matches published version
Scientific paper
10.1103/PhysRevD.71.043508
We study the evolution of cosmological perturbations, using a hybrid approximation scheme which upgrades the weak-field limit of Einstein's field equations to account for post-Newtonian scalar and vector metric perturbations and for leading-order source terms of gravitational waves, while including also the first and second-order perturbative approximations. Our equations, which are derived in the Poisson gauge, provide a unified description of matter inhomogeneities in a Universe filled with a pressureless and irrotational fluid and a cosmological constant, ranging from the linear to the highly non-linear regime. The derived expressions for scalar, vector and tensor modes can have a wide range of cosmological applications, ranging from secondary CMB anisotropy and polarization effects, cosmographic relations in a inhomogeneous Universe, gravitational lensing effects and the stochastic gravitational-wave backgrounds generated by non-linear cosmic structures.
Carbone Carmelita
Matarrese Sabino
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