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Title: Cosmic expansion and growth histories in Galileon scalar-tensor models of dark energy

Abstract

We study models of late-time cosmic acceleration in terms of scalar-tensor theories generalized to include a certain class of nonlinear derivative interaction of the scalar field. The nonlinear effect suppresses the scalar-mediated force at short distances to pass solar-system tests of gravity. It is found that the expansion history until today is almost indistinguishable from that of the {Lambda}CDM model or some (phantom) dark energy models, but the fate of the universe depends clearly on the model parameter. The growth index of matter density perturbations is computed to show that its past asymptotic value is given by 9/16, while the value today is as small as 0.4.

Authors:
 [1]
  1. Department of Physics, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo 169-8555 (Japan)
Publication Date:
OSTI Identifier:
21409720
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 81; Journal Issue: 10; Other Information: DOI: 10.1103/PhysRevD.81.103533; (c) 2010 The American Physical Society; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMPTOTIC SOLUTIONS; DENSITY; DISTURBANCES; EXPANSION; GRAVITATION; INTERACTIONS; NONLINEAR PROBLEMS; NONLUMINOUS MATTER; PERTURBATION THEORY; SCALAR FIELDS; SOLAR SYSTEM; UNIVERSE; MATHEMATICAL SOLUTIONS; MATTER; PHYSICAL PROPERTIES

Citation Formats

Kobayashi, Tsutomu. Cosmic expansion and growth histories in Galileon scalar-tensor models of dark energy. United States: N. p., 2010. Web. doi:10.1103/PHYSREVD.81.103533.
Kobayashi, Tsutomu. Cosmic expansion and growth histories in Galileon scalar-tensor models of dark energy. United States. https://doi.org/10.1103/PHYSREVD.81.103533
Kobayashi, Tsutomu. Sat . "Cosmic expansion and growth histories in Galileon scalar-tensor models of dark energy". United States. https://doi.org/10.1103/PHYSREVD.81.103533.
@article{osti_21409720,
title = {Cosmic expansion and growth histories in Galileon scalar-tensor models of dark energy},
author = {Kobayashi, Tsutomu},
abstractNote = {We study models of late-time cosmic acceleration in terms of scalar-tensor theories generalized to include a certain class of nonlinear derivative interaction of the scalar field. The nonlinear effect suppresses the scalar-mediated force at short distances to pass solar-system tests of gravity. It is found that the expansion history until today is almost indistinguishable from that of the {Lambda}CDM model or some (phantom) dark energy models, but the fate of the universe depends clearly on the model parameter. The growth index of matter density perturbations is computed to show that its past asymptotic value is given by 9/16, while the value today is as small as 0.4.},
doi = {10.1103/PHYSREVD.81.103533},
url = {https://www.osti.gov/biblio/21409720}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 10,
volume = 81,
place = {United States},
year = {2010},
month = {5}
}