Inhomogeneous Universe Models: the Szekeres Model

Details Inhomogeneous Universe Models: the Szekeres Model Inhomogeneous Universe Models: the Szekeres Model

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914306b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #143.06

Mathematics

Logic

Scientific paper

Observations of the luminosity distance and redshift of type Ia supernovae lead to the conclusion that the expansion of the universe is accelerating, but only when the observations are interpreted under the assumptions of homogeneity and isotropy on large scales. It has been shown that relaxing these assumptions allows for alternative universe models which match the observed distance-redshift relation without any mysterious ``dark energy''.
The simplest such models, the spherically symmetric Lemaître-Tolman-Bondi (LTB) class of models, have been much studied, and have been found by many to be problematic. The Szekeres class of models is a generalization of LTB which possesses no symmetries in general. It is able to better represent the lumpiness of the universe's matter distribution, and so it should serve as a more complete and accurate framework in which to interpret our observations.
We present an overview of the Szekeres model as it applies to cosmology. We show how its shape gives it advantages over LTB, such as a potential for faster structure formation, better compliance with the Copernican principle, and possibly even explaining the anomalous alignment of several cosmological observations. We briefly mention our progress on studying the CMB dipole seen by observers within a Szekeres universe.
This research was supported by the Texas Space Grant Consortium.

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