Time-dependent quark masses and big bang nucleosynthesis revisited
- Authors
- Cheoun, Myung-Ki; Kajino, Toshitaka; Kusakabe, Motohiko; Mathews, Grant J.
- Issue Date
- 8-Aug-2011
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW D, v.84, no.4
- Journal Title
- PHYSICAL REVIEW D
- Volume
- 84
- Number
- 4
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/13603
- DOI
- 10.1103/PhysRevD.84.043001
- ISSN
- 1550-7998
- Abstract
- We reinvestigate the constraints from primordial nucleosynthesis on a possible time-dependent quark mass. The limits on such quark-mass variations are particularly sensitive to the adopted observational abundance constraints. Hence, in the present study we have considered updated light-element abundances and uncertainties deduced from observations. We also consider new nuclear reaction rates and an independent analysis of the influence of such quark-mass variations on the resonance properties of the important He-3(d; p)He-4 reaction. We find that the updated abundance and resonance constraints imply a narrower range on the possible quark-mass variations in the early universe. We also find that, contrary to previous investigations, the optimum concordance region reduces to a (95% C. L.) value of -0.005 less than or similar to delta m(q)/m(q) less than or similar to 0.007 consistent with no variation in the averaged quark mass.
- Files in This Item
-
Go to Link
- Appears in
Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.