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arXiv:astro-ph/0504418 (astro-ph)
[Submitted on 19 Apr 2005 (v1), last revised 4 Jul 2005 (this version, v3)]

Title:Constraints on the Variation of G from Primordial Nucleosynthesis

Authors:T. Clifton, J. D. Barrow, R. J. Scherrer
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Abstract: We study here the effect of a varying G on the evolution of the early Universe and, in particular, on primordial nucleosynthesis. This variation of G is modelled using the Brans-Dicke theory as well as a more general class of scalar-tensor theories. Modified nucleosynthesis codes are used to investigate this effect and the results obtained are used to constrain the parameters of the theories. We extend previous studies of primordial nucleosynthesis in scalar-tensor theories by including effects which can cause a slow variation of G during radiation domination and by including a late-time accelerating phase to the Universe's history. We include a brief discussion on the epoch of matter-radiation equality in Brans-Dicke theory, which is also of interest for determining the positions of the cosmic microwave background power-spectrum peaks.
Comments: 10 pages, 7 figures. Published version
Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Report number: DAMTP-2005-44
Cite as: arXiv:astro-ph/0504418
  (or arXiv:astro-ph/0504418v3 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0504418
Journal reference: Phys.Rev. D71 (2005) 123526
Related DOI: https://doi.org/10.1103/PhysRevD.71.123526

Submission history

From: Timothy Clifton [view email]
[v1] Tue, 19 Apr 2005 17:15:14 UTC (562 KB)
[v2] Fri, 22 Apr 2005 20:15:38 UTC (562 KB)
[v3] Mon, 4 Jul 2005 16:05:37 UTC (563 KB)
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