Possible evidence for "dark radiation" from Big Bang Nucleosynthesis Data

TL;DR

This paper explores the possibility that a negative dark radiation component, inferred from Big Bang Nucleosynthesis discrepancies, could influence cosmological models within brane cosmology, suggesting new physics beyond standard models.

Contribution

It proposes that negative dark radiation may resolve BBN discrepancies within brane cosmology, offering a novel explanation for the observed data.

Findings

Dark radiation could be a small negative component affecting early universe evolution

The model can be consistent if brane-to-bulk leakage is addressed

Potential implications for cosmological parameters and evolution

Abstract

We address the emerging discrepancy between the Big Bang Nucleosynthesis data and standard cosmology, which asks for a bit longer evolution time. If this effect is real, one possible implication (in a framework of brane cosmology model) is that there is a ``dark radiation'' component which is negative and makes few percents of ordinary matter density. If so, all scales of this model can be fixed, provided brane-to-bulk leakage problem is solved.