Accelerating expansion of the universe may be caused by inhomogeneities

Gyula Bene, Viktor Czinner, Mátyás Vasúth

Research output: Contribution to journalArticle

6 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1117-1125
Number of pages9
JournalModern Physics Letters A
Issue number14
Publication statusPublished - May 10 2006


  • Relativistic cosmology

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics
  • Physics and Astronomy(all)

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