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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Maximal freedom at minimum cost: Linear large-scale structure in general modifications of gravity
Journal of Cosmology and Astroparticle Physics, Volume 2014, No. 7, Article 050, Year 2014
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Description
We present a turnkey solution, ready for implementation in numerical codes, for the study of linear structure formation in general scalar-tensor models involving a single universally coupled scalar field. We show that the totality of cosmological information on the gravitational sector can be compressed - without any redundancy - into five independent and arbitrary functions of time only and one constant. These describe physical properties of the universe: the observable background expansion history, fractional matter density today, and four functions of time describing the properties of the dark energy. We show that two of those dark-energy property functions control the existence of anisotropic stress, the other two - dark-energy clustering, both of which are can be scale-dependent. All these properties can in principle be measured, but no information on the underlying theory of acceleration beyond this can be obtained. We present a translation between popular models of late-time acceleration (e.g. perfect fluids, f(R), kinetic gravity braiding, galileons), as well as the effective field theory framework, and our formulation. In this way, implementing this formulation numerically would give a single tool which could consistently test the majority of models of late-time acceleration heretofore proposed. © 2014 IOP Publishing Ltd and Sissa Medialab srl .
Authors & Co-Authors
Bellini, Emilio
Germany, Heidelberg
Institut Für Theoretische Physik Heidelberg
Sawicki, Ignacy
South Africa, Muizenberg
African Institute for Mathematical Sciences
Statistics
Citations: 303
Authors: 2
Affiliations: 2
Identifiers
Doi:
10.1088/1475-7516/2014/07/050
e-ISSN:
14757516