A consistent scalar-tensor cosmology for inflation, dark energy and the Hubble parameter

C. H.-T. Wang; J. A. Reid; A. St J. Murphy; Daniel De Paula Farias Rodrigues; M. Al-Alawi; R. Bingham; J. T. Mendonca; T. B. Davies

doi:10.1016/j.physleta.2016.09.038

A consistent scalar-tensor cosmology for inflation, dark energy and the Hubble parameter

C. H.-T. Wang, J. A. Reid, A. St J. Murphy, Daniel De Paula Farias Rodrigues, M. Al-Alawi, R. Bingham, J. T. Mendonca, T. B. Davies

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Abstract

A Friedman cosmology is investigated based on scalar-tensor gravitation with general metric coupling and scalar potential functions. We show that for a broad class of such functions, the scalar field can be dynamically trapped using a recently suggested mechanism. The trapped scalar can drive inflation and accelerated cosmic expansion, compatible with standard requirements. The inflationary phase admits a natural exit with a value of the Hubble parameter dictated by the duration of inflation in a parameter independent manner. For inflationary duration consistent with the GUT description, the resulting Hubble parameter is found to be consistent with its observed value.

Original language	English
Pages (from-to)	3761-3765
Number of pages	5
Journal	Physics Letters A
Volume	380
Issue number	45
Early online date	28 Sep 2016
DOIs	https://doi.org/10.1016/j.physleta.2016.09.038
Publication status	Published - 25 Nov 2016

Keywords

Modified theories of gravity
cosmic inflation
dark energy

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http://arxiv.org/abs/1309.4066Licence: Unspecified

Charles Wang
- School of Natural & Computing Sciences, Physics - Reader
Person: Academic

Cite this

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title = "A consistent scalar-tensor cosmology for inflation, dark energy and the Hubble parameter",

abstract = "A Friedman cosmology is investigated based on scalar-tensor gravitation with general metric coupling and scalar potential functions. We show that for a broad class of such functions, the scalar field can be dynamically trapped using a recently suggested mechanism. The trapped scalar can drive inflation and accelerated cosmic expansion, compatible with standard requirements. The inflationary phase admits a natural exit with a value of the Hubble parameter dictated by the duration of inflation in a parameter independent manner. For inflationary duration consistent with the GUT description, the resulting Hubble parameter is found to be consistent with its observed value.",

keywords = "Modified theories of gravity, cosmic inflation, dark energy",

author = "Wang, {C. H.-T.} and Reid, {J. A.} and {St J. Murphy}, A. and {De Paula Farias Rodrigues}, Daniel and M. Al-Alawi and R. Bingham and Mendonca, {J. T.} and Davies, {T. B.}",

note = "The authors are grateful for financial support to the Cruickshank Trust (CW), EPSRC/GG-Top (CW, JR), Omani Government (MA), Science Without Borders programme, CNPq, Brazil (DR), and STFC/CfFP (CW, AM, RB, JM). CW and AM acknowledge the hospitality of CERN, where this work was started. The University of Aberdeen and University of Edinburgh are charitable bodies registered in Scotland, with respective registration numbers SC013683 and SC005336. ",

year = "2016",

month = nov,

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doi = "10.1016/j.physleta.2016.09.038",

language = "English",

volume = "380",

pages = "3761--3765",

journal = "Physics Letters A",

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TY - JOUR

T1 - A consistent scalar-tensor cosmology for inflation, dark energy and the Hubble parameter

AU - Wang, C. H.-T.

AU - Reid, J. A.

AU - St J. Murphy, A.

AU - De Paula Farias Rodrigues, Daniel

AU - Al-Alawi, M.

AU - Bingham, R.

AU - Mendonca, J. T.

AU - Davies, T. B.

N1 - The authors are grateful for financial support to the Cruickshank Trust (CW), EPSRC/GG-Top (CW, JR), Omani Government (MA), Science Without Borders programme, CNPq, Brazil (DR), and STFC/CfFP (CW, AM, RB, JM). CW and AM acknowledge the hospitality of CERN, where this work was started. The University of Aberdeen and University of Edinburgh are charitable bodies registered in Scotland, with respective registration numbers SC013683 and SC005336.

PY - 2016/11/25

Y1 - 2016/11/25

N2 - A Friedman cosmology is investigated based on scalar-tensor gravitation with general metric coupling and scalar potential functions. We show that for a broad class of such functions, the scalar field can be dynamically trapped using a recently suggested mechanism. The trapped scalar can drive inflation and accelerated cosmic expansion, compatible with standard requirements. The inflationary phase admits a natural exit with a value of the Hubble parameter dictated by the duration of inflation in a parameter independent manner. For inflationary duration consistent with the GUT description, the resulting Hubble parameter is found to be consistent with its observed value.

AB - A Friedman cosmology is investigated based on scalar-tensor gravitation with general metric coupling and scalar potential functions. We show that for a broad class of such functions, the scalar field can be dynamically trapped using a recently suggested mechanism. The trapped scalar can drive inflation and accelerated cosmic expansion, compatible with standard requirements. The inflationary phase admits a natural exit with a value of the Hubble parameter dictated by the duration of inflation in a parameter independent manner. For inflationary duration consistent with the GUT description, the resulting Hubble parameter is found to be consistent with its observed value.

KW - Modified theories of gravity

KW - cosmic inflation

KW - dark energy

U2 - 10.1016/j.physleta.2016.09.038

DO - 10.1016/j.physleta.2016.09.038

M3 - Article

VL - 380

SP - 3761

EP - 3765

JO - Physics Letters A

JF - Physics Letters A

SN - 0375-9601

IS - 45

ER -

A consistent scalar-tensor cosmology for inflation, dark energy and the Hubble parameter

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Charles Wang

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