Big-Bang Nucleosynthesis on a bubble universe nucleated in Kerr-AdS$_5$ Black Hole

TL;DR

This paper models Big-Bang Nucleosynthesis within a bubble universe around a rotating black hole in Kerr-AdS$_5$ spacetime, linking black hole parameters to primordial element abundances and addressing the helium anomaly.

Contribution

It introduces a novel scenario of a bubble universe in Kerr-AdS$_5$ spacetime to explain light-element observations, highlighting the role of black hole mass and spin.

Findings

Black hole mass and spin influence primordial helium abundance.

The model offers a potential explanation for the helium anomaly.

Connections are suggested between light-element observations and bubble universe scenarios.

Abstract

We present the Big-Bang Nucleosynthesis (BBN) simulation with a bubble universe scenario around a rotating black hole (BH) in Kerr-AdS$_5$ spacetime to explain recently updated observations of light elements such as the primordial helium abundance. In this scenario, the geometry of the 4D-early Universe is described as a vacuum bubble that undergoes quasi-de Sitter expansion in Kerr-AdS$_5$ spacetime. We find that the BH mass and spin parameter, which show an anti-correlation against the total radiation, are important to resolve the ${}^4{\rm He}$ anomaly. The present results provide clues to finding a connection between the observed results of light-element nucleosynthesis and the scenario of the 4D-bubble universe in AdS$_5$ spacetimes.