2016/01/31 by Austin Joyce, Lucas Lombriser, Fabian Schmidt · 409 citations
Physics and Astronomy · #astro-ph.CO #gr-qc #hep-ph
paper · pdf · doi:10.1146/annurev-nucl-102115-044553
published in Annual Review of Nuclear and Particle Science 66(1), 95-122 (Annual Reviews) · 29 pages, 4 figures; invited review submitted to Annual Reviews of Nuclear and Particle Science; v2: some pertinent references added; v3: table with constraints added, reflects published version; v4 [trivial]: fixed missing references in arxiv version
arxiv created 2016/06/14 · crossref created 2016/06/30 · crossref issued 2016/10/19 · crossref published 2016/10/19 · crossref published-print 2016/10/19 · arxiv updated 2016/12/01 · crossref deposited 2022/07/02 · crossref indexed 2026/08/06
Understanding the reason for the observed accelerated expansion of the Universe represents one of the fundamental open questions in physics. In cosmology, a classification has emerged among physical models for this acceleration, distinguishing between dark energy and modified gravity. In this review, we provide a brief overview of models in both categories as well as their phenomenology and characteristic observable signatures in cosmology. We also introduce a rigorous distinction between dark energy and modified gravity based on the strong and weak equivalence principles.