Cosmic Growth and Expansion Conjoined
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Date
2016-10-17
Authors
Linder, Eric V.
Journal Title
Journal ISSN
Volume Title
Publisher
International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
Abstract
Cosmological measurements of both the expansion history and growth history have matured, and the two together provide an important test of general relativity. We consider their joint evolutionary track, showing that this has advantages in distinguishing cosmologies relative to considering them individually or at isolated redshifts. In particular, the joint comparison relaxes the shape degeneracy that makes f 8(z) curves difficult to separate from the overall growth amplitude. The conjoined method further helps visualization of which combinations of redshift ranges provide the clearest discrimination. We examine standard dark energy cosmologies, modified gravity, and “stuttering” growth, each showing distinct signatures.
Description
Keywords
cosmology, dark energy, cosmic growth, gravity, Research Subject Categories::NATURAL SCIENCES::Physics::Astronomy and astrophysics::Cosmology
Citation
Linder, Eric V. (2016) Cosmic Growth and Expansion Conjoined. International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory