Inhomogeneous cosmology and backreaction: Current status and future prospects
Astronomical observations reveal hierarchical structures in the universe, from galaxies, groups of galaxies, clusters and superclusters, to filaments and voids. On the largest scales, it seems that some kind of statistical homogeneity can be observed. As a result, modern cosmological models are based on spatially homogeneous and isotropic solutions of the Einstein equations, and the evolution of the universe is approximated by the Friedmann equations. In parallel to standard homogeneous cosmology, the field of inhomogeneous cosmology and backreaction is being developed. This field investigates whether small scale inhomogeneities via nonlinear effects can backreact and alter the properties of the universe on its largest scales, leading to a non-Friedmannian evolution. This paper presents the current status of inhomogeneous cosmology and backreaction. It also discusses future prospects of the field of inhomogeneous cosmology, which is based on a survey of 50 academics working in the field of inhomogeneous cosmology.
Australian Research Council
Publication titleInternational Journal of Modern Physics D
Department/SchoolSchool of Natural Sciences
PublisherWorld Scientific Publ Co Pte Ltd
Place of publicationJournal Dept Po Box 128 Farrer Road, Singapore, Singapore, 912805
Rights statementPreprint of an article published in International journal of modern physics D, 26(1), 2017, 1730011, DOI: 10.1142/S0218271817300117 © copyright World Scientific Publishing Company https://www.worldscientific.com/worldscinet/ijmpd