Coupled Variations of Fundamental Couplings and Primordial Nucleosynthesis

Abstract

The effect of variations of the fundamental nuclear parameters on big-bang nucleosynthesis are modeled and discussed in detail taking into account the interrelations between the fundamental parameters arising in unified theories. Considering only \he4, strong constraints on the variation of the neutron lifetime, neutron-proton mass difference are set. These constraints are then translated into constraints on the time variation of the Yukawa couplings and the fine structure constant. Furthermore, we show that a variation of the deuterium binding energy is able to reconcile the \li7 abundance deduced from the WMAP analysis with its spectroscopically determined value while maintaining concordance with D and \he4. The analysis is strongly based on the potential model of Flambaum and Shuryak that relates the binding energy of the deuteron with the nucleon and $\sigma$ and $\omega$ mesons masses, however, we show that an alternative approach that consists of a pion mass dependence necessarily leads to equivalent conclusions.

12 pages, 6 figures. Revised sensitivity of B_D with the fundamental parameters. Added section on the sensitivity of B_D with the pion mass. Conclusions unchanged

References in corpus (3)

• The acceleration of the universe and the physics behind it
• Bound-State Effects on Light-Element Abundances in Gravitino Dark Matter Scenarios
• Extraction of the pion-nucleon sigma-term from the spectrum of exotic baryons

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