Salvaging 1/R gravity models

It has been suggested that a 1/R addition to the gravitational Lagrangian could be the source of the observed late-time cosmological acceleration. By itself this term is ruled out by constraints on scalar-tensor gravity, but the addition of extra contributions of the form R^p makes it possible to ev...

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Detalles Bibliográficos
Autor principal: Cline, James M.
Lenguaje:eng
Publicado: 2003
Materias:
Astrophysics and Astronomy
Acceso en línea:http://cds.cern.ch/record/630211
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author Cline, James M.
author_facet Cline, James M.
author_sort Cline, James M.
collection CERN
description It has been suggested that a 1/R addition to the gravitational Lagrangian could be the source of the observed late-time cosmological acceleration. By itself this term is ruled out by constraints on scalar-tensor gravity, but the addition of extra contributions of the form R^p makes it possible to evade these constraints. We discuss the general conditions for such theories to be viable, and identify the least unnatural candidates.
id cern-630211
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2003
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spelling cern-6302112023-03-14T20:38:29Zhttp://cds.cern.ch/record/630211engCline, James M.Salvaging 1/R gravity modelsAstrophysics and AstronomyIt has been suggested that a 1/R addition to the gravitational Lagrangian could be the source of the observed late-time cosmological acceleration. By itself this term is ruled out by constraints on scalar-tensor gravity, but the addition of extra contributions of the form R^p makes it possible to evade these constraints. We discuss the general conditions for such theories to be viable, and identify the least unnatural candidates.This paper has been withdrawn by the author. It was argued that increasing F' would reduce the strength of the scalar coupling to matter. This argument failed to realize that the gravitational coupling to matter is controlled by the same power of F', hence the scalar always couples with the same strength as gravity.CERN-TH-2003-174astro-ph/0307423CERN-TH-2003-174oai:cds.cern.ch:6302112003-07-24
spellingShingle Astrophysics and Astronomy
Cline, James M.
Salvaging 1/R gravity models
title Salvaging 1/R gravity models
title_full Salvaging 1/R gravity models
title_fullStr Salvaging 1/R gravity models
title_full_unstemmed Salvaging 1/R gravity models
title_short Salvaging 1/R gravity models
title_sort salvaging 1/r gravity models
topic Astrophysics and Astronomy
url http://cds.cern.ch/record/630211
work_keys_str_mv AT clinejamesm salvaging1rgravitymodels

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