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ACCELERATING EXPANSION OF THE UNIVERSE MAY BE CAUSED BY INHOMOGENEITIES

GYULA BENE

Institute for Theoretical Physics, Eötvös University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary

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VIKTOR CZINNER

KFKI Research Institute for Particle and Nuclear Physics, Budapest 114, P. O. Box 49, H-1525, Hungary

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, and

MÁTYÁS VASÚTH

KFKI Research Institute for Particle and Nuclear Physics, Budapest 114, P. O. Box 49, H-1525, Hungary

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https://doi.org/10.1142/S0217732306020652Cited by:6 (Source: Crossref)

Abstract

We point out that, due to the nonlinearity of the Einstein equations, a homogeneous approximation in cosmology leads to the appearance of an additional term in the Friedmann equation. This new term is associated with the spatial inhomogeneities of the metric and can be expressed in terms of density fluctuations. Although it is not constant, it decays much slower (as t^-2/3) than the other terms (like density) which decrease as t^-2. The presence of the new term leads to a correction in the scale factor that is proportional to t² and may give account of the recently observed accelerating expansion of the universe without introducing a cosmological constant.

Keywords:

Relativistic cosmology

PACS: 98.80.Jk, 98.80.Bp

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