Big-Bang Nucleosynthesis as a Probe of the Geometry of Superspace

Abstract

We study the effect from a general ultralocal supermetric on primordial nucleosynthesis for Friedmann-Robertson-Walker Cosmology. The parameter $\lambda$ of the supermetric changes the effective number of degrees of freedom, $g_{\ast }$, which modifies the Friedmann equation. This modification produces variations in the production of primordial ${}^{4}He$. The observations of the primordial abundances of light elements (${}^{4}He$, $D$, ${}^{3}He$ and ${}^{7}Li$) allow to estimate bounds on the values of $\lambda$ consistent with these observations. We obtain $0.87\le \lambda \le 1.04$. In addition we analyze the importance of $\lambda <1$ to explain possible incompatibilities in the standard Big-Bang nucleosynthesis.

15 pages, 2 PostScript figures

References in corpus (1)

• Refined Big Bang Nucleosynthesis Constraints on ${\Omega }_{Baryon}$ and $N_{\nu }$

Cited by in corpus (2)

• Oscillating universes as eigensolutions of cosmological Schrödinger equation
• A New Family of Gauges in Linearized General Relativity