Reconciling the local void with the CMB

Journal Article · Tue Mar 15 04:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.063506· OSTI ID:21537499

Nadathur, Seshadri; Sarkar, Subir ^[1]

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1. Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3NP (United Kingdom)

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 center of a void modeled by a Lemaitre-Tolman-Bondi metric. It has been claimed that such models cannot fit the cosmic microwave background (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.

• OSTI ID: 21537499
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 83; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
BARYONS
BINARY STARS
COSMOLOGICAL MODELS
DENSITY
DISTURBANCES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ERUPTIVE VARIABLE STARS
EXPANSION
FERMIONS
HADRONS
HUBBLE EFFECT
MATHEMATICAL MODELS
MATTER
MICROWAVE RADIATION
NONLUMINOUS MATTER
NUCLEOSYNTHESIS
OSCILLATIONS
PERTURBATION THEORY
PHYSICAL PROPERTIES
RADIATIONS
RELICT RADIATION
SPECTRA
STARS
SUPERNOVAE
SYNTHESIS
VARIABLE STARS
VOIDS