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Quark mass variation constraints from Big Bang nucleosynthesis

P. Bedaque ; T. Luu ; Lucas Platter (Institutionen för fundamental fysik, Subatomär fysik)
Physical Review C (0556-2813). Vol. 83 (2011), 4,
[Artikel, refereegranskad vetenskaplig]

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 4He abundances put a bound of -1%≲δmq/mq≲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 η. Including bounds on the variation of η coming from WMAP results and adding some additional assumptions further narrows the range of allowed values of δmq/mq.



Denna post skapades 2011-05-06. Senast ändrad 2012-09-19.
CPL Pubid: 140406

 

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Institutioner (Chalmers)

Institutionen för fundamental fysik, Subatomär fysik (2005-2013)

Ämnesområden

Fysik

Chalmers infrastruktur