Intrinsically symmetric cosmological model in the presence of dissipative fluids
arXiv:1907.06546 · doi:10.1142/S0218271821500334
Abstract
Based upon the intrinsic symmetries approach to inhomogeneous cosmologies, we propose an exact solution to Einstein's field equations where the spatial sections are flat and the source is a non-perfect fluid such that the dissipative terms can be written in terms of spatial gradients of the energy density under a suitable choice of the coordinate system. It is shown through the calculation of the luminosity distance as a function of the redshift that the presence of such inhomogeneities may lead to an effective deceleration parameter compatible with either the standard CDM model or LTB models depending on the choice of boundary conditions with no exotic matter. This fact is another evidence that different inhomogeneous models should be carefully investigated in order to verify which model may be compatible with observations and still be as close as possible to the standard model regarding the underlying assumptions, without resorting necessarily to exotic matter components.
arXiv comment12 pages, last version, published in IJMPD
References in corpus (22)
- Jerk, snap, and the cosmological equation of state
- On average properties of inhomogeneous fluids in general relativity I: dust cosmologies
- An inhomogeneous alternative to dark energy?
- Confronting Lemaitre-Tolman-Bondi models with Observational Cosmology
- Inhomogeneous cosmological models: exact solutions and their applications
- Is there proof that backreaction of inhomogeneities is irrelevant in cosmology?
- Inhomogeneity and the foundations of concordance cosmology
- Mimicking Dark Energy with Lemaitre-Tolman-Bondi Models: Weak Central Singularities and Critical Points
- How well is our universe described by an FLRW model?
- What is dust? - Physical foundations of the averaging problem in cosmology
- Cosmic acceleration: Inhomogeneity versus vacuum energy
- Ricci focusing, shearing, and the expansion rate in an almost homogeneous Universe
- Shear-free, Irrotational, Geodesic, Anisotropic Fluid Cosmologies
- Black-Hole Lattices as Cosmological Models
- On the Newtonian Limit of the Weyl Tensor
- A general reconstruction of the recent expansion history of the universe
- Dependence on supernovae light-curve processing in void models
- Magnetic fields and the Weyl tensor in the early universe
- Taylor expansion of luminosity distance in Szekeres cosmological models: Effects of local structures evolution on cosmographic parameters
- Cosmological models with flat spatial geometry
- On the local form of static plane symmetric space-times in the presence of matter
- Scalar perturbations in a Friedmann-like metric with non-null Weyl tensor