Exact spherically-symmetric inhomogeneous model with n perfect fluids

Journal Article · Sun Jan 01 00:00:00 EST 2012 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2012/01/025· OSTI ID:22280176

Marra, Valerio ^[1]; Pääkkönen, Mikko ^[2]

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1. Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg (Germany)
2. Department of Physics, PL 35 (YFL), 40014 University of Jyväskylä (Finland)

We present the exact equations governing the dynamics of a spherically-symmetric inhomogeneous model with n decoupled and non-comoving perfect fluids. Thanks to the use of physically meaningful quantities we write the set of 3+2n equations in a concise and transparent way. The n perfect fluids can have general equations of state, thus making the model extremely flexible to study a large variety of cosmological and astrophysical problems. As applications we consider a model sourced by two non-comoving dust components and a cosmological constant, and a model featuring dust and a dark energy component with negligible speed of sound.

• OSTI ID: 22280176
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2012, Issue 01; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
COSMIC DUST
COSMOLOGICAL CONSTANT
COSMOLOGICAL MODELS
COSMOLOGY
EQUATIONS OF STATE
NONLUMINOUS MATTER
SOUND WAVES
SPHERICAL CONFIGURATION
SYMMETRY
VELOCITY