Quark mass variation constraints from Big Bang nucleosynthesis

Details Quark mass variation constraints from Big Bang nucleosynthesis Quark mass variation constraints from Big Bang nucleosynthesis

2010-12-17

arxiv.org/abs/1012.3840v2

Phys.Rev.C83:045803,2011

Physics

Nuclear Physics

Nuclear Theory

8 pages, 3 figures, figures and references updated

Scientific paper

10.1103/PhysRevC.83.045803

We study the impact on the primordial abundances of light elements created by a variation of the quark masses at the time of Big Bang nucleosynthesis (BBN). In order to navigate through the particle and nuclear physics required to connect quark masses to binding energies and reaction rates in a model-independent way, we use lattice QCD data and a hierarchy of effective field theories. We find that the measured Helium-4 abundances put a bound of -1 % <~ d m_q/m_q <~ 0.7 % on a possible variation of quark masses. The effect of quark mass variations on the deuterium abundances can be largely compensated by changes of the baryon-to-photon ratio eta. Including bounds on the variation of eta coming from WMAP results and adding some additional assumptions further narrows the range of allowed values of d m_q/m_q.

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