Errors in Estimating Omega_Lambda due to the Fluid Approximation
arXiv:0908.4488 · doi:10.1088/1475-7516/2009/10/026
Abstract
The matter content of the Universe is strongly inhomogeneous on small scales. Motivated by this fact, we consider a model of the Universe that has regularly spaced discrete masses, rather than a continuous fluid. The optical properties of such space-times can differ considerably from the continuous fluid case, even if the 'average' dynamics are the same. We show that these differences have consequences for cosmological parameter estimation, and that fitting to recent supernovae observations gives a correction to the inferred value of Omega_Lambda of ~10%.
5 pages, 2 figures
References in corpus (4)
Cited by in corpus (39)
- (Mis-)Interpreting supernovae observations in a lumpy universe
- Light propagation in statistically homogeneous and isotropic universes with general matter content
- Departures from the FLRW Cosmological Model in an Inhomogeneous Universe: A Numerical Examination
- Interpretation of the Hubble diagram in a nonhomogeneous universe
- Average expansion rate and light propagation in a cosmological Tardis spacetime
- An exact quantification of backreaction in relativistic cosmology
- Non-Gaussianity of quantum fields during inflation
- On the absence of the usual weak-field limit, and the impossibility of embedding some known solutions for isolated masses in cosmologies with f(R) dark energy
- Can all cosmological observations be accurately interpreted with a unique geometry?
- How does the cosmic large-scale structure bias the Hubble diagram?
- Ricci focusing, shearing, and the expansion rate in an almost homogeneous Universe
- Redshift and distances in a ΛCDM cosmology with non-linear inhomogeneities
- Dynamics of a lattice Universe
- An Improved Treatment of Optics in the Lindquist-Wheeler Models
- A two-mass expanding exact space-time solution
- Large-scale inhomogeneities may improve the cosmic concordance of supernovae
- Exact Evolution of Discrete Relativistic Cosmological Models
- Light propagation and the average expansion rate in near-FRW universes
- Cosmology Without Averaging
- Post-Newtonian Cosmological Modelling
- Light propagation through black-hole lattices
- SNe observations in a meatball universe with a local void
- Ray tracing and Hubble diagrams in post-Newtonian cosmology
- The theory of stochastic cosmological lensing
- The Lindquist-Wheeler formulation of lattice universes
- Theoretical and numerical perspectives on cosmic distance averages
- On the relationship between mean observations, spatial averages and the Dyer-Roeder approximation in Einstein-Straus models
- Averaging in cosmological models using scalars
- CMB seen through random Swiss Cheese
- Thermodynamics of Shearing Massless Scalar Field Spacetimes is Inconsistent With the Weyl Curvature Hypothesis
- Assessing the foundation and applicability of some dark energy fluid models in the Dirac-Born-Infeld framework
- The effect of dark matter discreteness on light propagation
- Cosmological Solutions with Charged Black Holes
- Hubble Diagrams in Statistically Homogeneous, Anisotropic Universes
- Evaluating backreaction with the ellipsoidal collapse model
- Observational backreaction in discrete black holes lattice cosmological models
- Construction of the cosmological model with periodically distributed inhomogeneities with growing amplitude
- Post-Newtonian Gravity in Cosmology
- Holographic Principle and the Second Law in Stephani Cosmology Revisited