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Title: Spherically symmetric cosmological spacetimes with dust and radiation — numerical implementation

We present new numerical cosmological solutions of the Einstein Field Equations. The spacetime is spherically symmetric with a source of dust and radiation approximated as a perfect fluid. The dust and radiation are necessarily non-comoving due to the inhomogeneity of the spacetime. Such a model can be used to investigate non-linear general relativistic effects present during decoupling or big-bang nucleosynthesis, as well as for investigating void models of dark energy with isocurvature degrees of freedom. We describe the full evolution of the spacetime as well as the redshift and luminosity distance for a central observer. After demonstrating accuracy of the code, we consider a few example models, and demonstrate the sensitivity of the late time model to the degree of inhomogeneity of the initial radiation contrast.
Authors:
 [1] ;  [2] ;  [3]
  1. Department of Mathematics, University of Waikato, Private Bag 3105, Hamilton 3240 (New Zealand)
  2. Dipartimento di Fisica, Università di Torino and INFN, Torino (Italy)
  3. Astrophysics, Cosmology and Gravity Centre, and Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch 7701, Cape Town (South Africa)
Publication Date:
OSTI Identifier:
22282663
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; COSMOLOGY; DECOUPLING; DEGREES OF FREEDOM; EINSTEIN FIELD EQUATIONS; LUMINOSITY; MATHEMATICAL SOLUTIONS; NONLINEAR PROBLEMS; NONLUMINOUS MATTER; NUCLEOSYNTHESIS; RED SHIFT; RELATIVISTIC RANGE; SPACE-TIME; SPHERICAL CONFIGURATION; SYMMETRY