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Department of Physics, University of Ioannina, Ioannina 45110, Greece





Abstract A wide range of large scale observations hint towards possible modifications on the standard cosmological model which is based on a homogeneous and isotropic universe with a small cosmological constant and matter. These observations, also known as -cosmic anomalies- include unexpected Cosmic Microwave Background perturbations on large angular scales, large dipolar peculiar velocity flows of galaxies -bulk flows-, the measurement of inhomogenous values of the fine structure constant on cosmological scales -alpha dipole- and other effects. The presence of the observational anomalies could either be a large statistical fluctuation in the context of ΛCDM or it could indicate a non-trivial departure from the cosmological principle on Hubble scales. Such a departure is very much constrained by cosmological observations for matter. For dark energy however there are no significant observational constraints for Hubble scale inhomogeneities. In this brief review I discuss some of the theoretical models that can naturally lead to inhomogeneous dark energy, their observational constraints and their potential to explain the large scale cosmic anomalies. View Full-Text

Keywords: dark energy; cosmological principle; inhomogeneous anisotropic universe dark energy; cosmological principle; inhomogeneous anisotropic universe





Autor: Leandros Perivolaropoulos

Fuente: http://mdpi.com/



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