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Light propagation through large-scale inhomogeneities in the Universe and its impact on cosmological observations

Published online by Cambridge University Press:  30 September 2008

A. Oscoz ,
E. Mediavilla ,
M. Serra-Ricart  and
K. Bolejko
K. Bolejko*
Affiliation:
Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warsaw, Poland
*
bolejko@camk.edu.pl
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Abstract

This paper analyses cosmological observations within inhomogeneous and exact solutions of the Einstein equations. In some way the analyses presented here can be freed from assumptions such as small amplitude of the density contrast.The supernova observations are analysed using the Lemaître–Tolman model and the CMB observations are analysed using the quasispherical Szekeres model.The results show that it is possible to fit the supernova datawithout the cosmological constant. However ifinhomogeneities of sizes and amplitudes as observed in the local Universeare considered, their impact on cosmological observations is small.

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References

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Plebański, J., & Krasiński, A., 2006, An introduction to general relativity and cosmology (Cambridge, Cambridge University Press)
Tolman, R.C., 1934, Proc. Nat. Acad. Sci. USA, 20, 169; 1997, reprinted in Gen. Relativ. Gravit., 29, 935 CrossRef
Szekeres, P., 1975, Commun. Math. Phys., 41, 55 CrossRef