Reconciling the local void with the CMB
arXiv:1012.3460 · doi:10.1103/PhysRevD.83.063506
Abstract
In the standard cosmological model, the dimming of distant Type Ia supernovae is explained by invoking the existence of repulsive `dark energy' which is causing the Hubble expansion to accelerate. However this may be an artifact of interpreting the data in an (oversimplified) homogeneous model universe. In the simplest inhomogeneous model which fits the SNe Ia Hubble diagram without dark energy, we are located close to the centre of a void modelled by a Lemaítre-Tolman-Bondi metric. It has been claimed that such models cannot fit the CMB and other cosmological data. This is however based on the assumption of a scale-free spectrum for the primordial density perturbation. An alternative physically motivated form for the spectrum enables a good fit to both SNe Ia (Constitution/Union2) and CMB (WMAP 7-yr) data, and to the locally measured Hubble parameter. Constraints from baryon acoustic oscillations and primordial nucleosynthesis are also satisfied.
13 pages, 4 figures. Typos corrected and missing references added. Matches the published version in PRD
References in corpus (35)
- Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
- Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
- Observational Constraints on the Nature of the Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey
- Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
- A general test of the Copernican Principle
- Confronting Lemaitre-Tolman-Bondi models with Observational Cosmology
- Exact solution to the averaging problem in cosmology
- Time drift of cosmological redshifts as a test of the Copernican principle
- On cosmological observables in a swiss-cheese universe
- Inflation and WMAP three year data: Features have a Future!
- A Test of the Copernican Principle
- Living in a Void: Testing the Copernican Principle with Distant Supernovae
- Mimicking Dark Energy with Lemaitre-Tolman-Bondi Models: Weak Central Singularities and Critical Points
- New Constraints on Oscillations in the Primordial Spectrum of Inflationary Perturbations
- Looking the void in the eyes - the kSZ effect in LTB models
- Testing the Void against Cosmological data: fitting CMB, BAO, SN and H0
- Light-cone averages in a swiss-cheese universe
- Can we avoid dark energy?
- Scalar Perturbations on Lemaitre-Tolman-Bondi Spacetimes
- The supernova Hubble diagram for off-center observers in a spherically symmetric inhomogeneous universe
- Mapping Luminosity-Redshift Relationship to LTB Cosmology
- Local Void vs Dark Energy: Confrontation with WMAP and Type Ia Supernovae
- Comparison of Distances from RR Lyrae Stars, the Tip of the Red-Giant Branch and Classical Cepheids
- Evaluating backreaction with the peak model of structure formation
- Features in the Primordial Spectrum from WMAP: A Wavelet Analysis
- Reconstruction of the Primordial Power Spectrum using Temperature and Polarisation Data from Multiple Experiments
- Inhomogeneous spacetimes as a dark energy model
- First Cosmological Constraints on Dark Energy from the Radial Baryon Acoustic Scale
- Gravitational energy as dark energy: Concordance of cosmological tests
- Cosmological Backreaction from Perturbations
- Swiss Cheese and a Cheesy CMB
- Cosmic Inhomogeneities and the Average Cosmological Dynamics
- Systematic corrections to the measured cosmological constant as a result of local inhomogeneity
- Is dark energy an effect of averaging?
- Analytical Estimate of the Effect of Spherical Inhomogeneities on Luminosity Distance and Redshift