Possible evidence for a change in cosmic equation of state at decoupling
J. A. Gonzalo, M. I. Marques
Abstract
Indirect but significative evidence (from fusion research data, and from the known 4He abundance) relevant to primordial nucleosynthesis is examined. It is shown that this evidence supports a change in cosmic equation of state at decoupling, compatible with Einstein's cosmological equations, from ROm T4 aprox. cte (ROm=ROr) prior to decoupling (t<taf), to ROmT3 aprox. cte after (t>taf), being taf the atom formation time. Implications at the baryon threshold time (temperature) and beyond are discussed.
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