2011/09/21 by B. Bochner, Bochner, Brett
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Gamma-ray bursts and supernovae #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #Relativity and Gravitational Theory
paper · pdf · doi:10.48550/arxiv.1109.4686
openalex publication_date 2011/09/21 · openalex created_date 2022/10/01 · openalex updated_date 2026/07/28
A phenomenological formalism is presented in which the apparent acceleration\nof the universe is generated by large-scale structure formation, thus\neliminating the coincidence and magnitude fine-tuning problems of the\nCosmological Constant in the Concordance Model, as well as potential\ninstability issues with dynamical Dark Energy. The observed acceleration\nresults from the combined effect of innumerable local perturbations, due to\nindividually virialized systems, overlapping together in a\nsmoothly-inhomogeneous adjustment of the FRW metric, in a process governed by\nthe causal flow of inhomogeneity information outward from each clumped system.\nWe discuss several arguments from the literature claiming to place sharp limits\nupon the strength of backreaction-related effects, and show why such arguments\nare not applicable in a physically realistic cosmological analysis. A selection\nof simply-parameterized models are presented, including several which are\ncapable of fitting the luminosity distance data from Type Ia supernovae\nessentially as well as the best-fit flat \ΛCDM model, without resort to\nDark Energy, any modification to gravity, or a local void. Simultaneously,\nthese models can reproduce measured cosmological parameters such as the age of\nthe universe, the matter density required for spatial flatness, the present-day\ndeceleration parameter, and the angular scale of the Cosmic Microwave\nBackground to within a reasonable proximity of their Concordance values. We\nconclude by considering potential observational signatures for distinguishing\nthis cosmological formalism from \ΛCDM or Dark Energy, as well as the\npossible long-term fate of such a universe with ever-spreading spheres of\ninfluence for its increasingly superposed perturbations.\n