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 languageEnglish
Pages (from-to)3761-3765
Number of pages5
JournalPhysics Letters A
Volume380
Issue number45
Early online date28 Sep 2016
DOIs
Publication statusPublished - 25 Nov 2016

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dark energy
cosmology
tensors
scalars
grand unified theory
gravitation
requirements
expansion

Keywords

  • Modified theories of gravity
  • cosmic inflation
  • dark energy

Cite this

Wang, C. H-T., Reid, J. A., St J. Murphy, A., De Paula Farias Rodrigues, D., Al-Alawi, M., Bingham, R., ... Davies, T. B. (2016). A consistent scalar-tensor cosmology for inflation, dark energy and the Hubble parameter. Physics Letters A, 380(45), 3761-3765. https://doi.org/10.1016/j.physleta.2016.09.038

A consistent scalar-tensor cosmology for inflation, dark energy and the Hubble parameter. / Wang, C. H.-T.; Reid, J. A.; St J. Murphy, A.; De Paula Farias Rodrigues, Daniel; Al-Alawi, M.; Bingham, R.; Mendonca, J. T.; Davies, T. B.

In: Physics Letters A, Vol. 380, No. 45, 25.11.2016, p. 3761-3765.

Research output: Contribution to journalArticle

Wang, CH-T, Reid, JA, St J. Murphy, A, De Paula Farias Rodrigues, D, Al-Alawi, M, Bingham, R, Mendonca, JT & Davies, TB 2016, 'A consistent scalar-tensor cosmology for inflation, dark energy and the Hubble parameter', Physics Letters A, vol. 380, no. 45, pp. 3761-3765. https://doi.org/10.1016/j.physleta.2016.09.038
Wang CH-T, Reid JA, St J. Murphy A, De Paula Farias Rodrigues D, Al-Alawi M, Bingham R et al. A consistent scalar-tensor cosmology for inflation, dark energy and the Hubble parameter. Physics Letters A. 2016 Nov 25;380(45):3761-3765. https://doi.org/10.1016/j.physleta.2016.09.038
Wang, C. H.-T. ; Reid, J. A. ; St J. Murphy, A. ; De Paula Farias Rodrigues, Daniel ; Al-Alawi, M. ; Bingham, R. ; Mendonca, J. T. ; Davies, T. B. / A consistent scalar-tensor cosmology for inflation, dark energy and the Hubble parameter. In: Physics Letters A. 2016 ; Vol. 380, No. 45. pp. 3761-3765.
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