Unified treatment of cosmological perturbations from superhorizon to small scales

Journal Article · Tue Feb 15 04:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.043508· OSTI ID:20705994

Carbone, Carmelita; Matarrese, Sabino ^[1]

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1. SISSA/ISAS, Via Beirut 4, I-34014, Trieste (Italy)

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 nonlinear regime. The derived expressions for scalar, vector and tensor modes may have a wide range of cosmological applications, including secondary CMB anisotropy and polarization effects, cosmographic relations in a inhomogeneous Universe, gravitational lensing and the stochastic gravitational-wave backgrounds generated by nonlinear cosmic structures.

• OSTI ID: 20705994
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 4 Vol. 71; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
COSMOLOGICAL CONSTANT
COSMOLOGY
DISTURBANCES
EINSTEIN FIELD EQUATIONS
GRAVITATIONAL WAVES
NONLINEAR PROBLEMS
POLARIZATION
SCALARS
SOURCE TERMS
UNIVERSE
VECTORS