期刊
GALAXIES
卷 2, 期 1, 页码 22-61出版社
MDPI
DOI: 10.3390/galaxies2010022
关键词
dark energy; cosmological principle; inhomogeneous anisotropic universe
资金
- European Union (European Social Fund-ESF)
- Greek national funds through Operational Program Education and Lifelong Learning of National Strategic Reference Framework (NSRF)-Research Funding Program: ARISTEIA
- society of knowledge through the European Social Fund
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 Lambda CDM 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
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