Brane Big-Bang Brought by Bulk Bubble
Uchida Gen, Akihiro Ishibashi, and Takahiro Tanaka

TL;DR
This paper introduces a novel inflationary universe model within Randall-Sundrum braneworld cosmology, where a bulk false vacuum decay triggers a brane big-bang, linking extra-dimensional dynamics to early universe evolution.
Contribution
It presents a new inflationary scenario driven by bulk vacuum decay and analyzes the conditions for successful reheating and compatibility with known physics.
Findings
The model can produce a hot big-bang universe consistent with nucleosynthesis.
Constraints on parameters require fine-tuning for certain cosmological conditions.
The scenario can recover Newton's law up to 1mm scale.
Abstract
We propose an alternative inflationary universe scenario in the context of Randall-Sundrum braneworld cosmology. In this new scenario the existence of extra-dimension(s) plays an essential role. First, the brane universe is initially in the inflationary phase driven by the effective cosmological constant induced by small mismatch between the vacuum energy in the 5-dimensional bulk and the brane tension. This mismatch arises since the bulk is initially in a false vacuum. Then, the false vacuum decay occurs, nucleating a true vacuum bubble with negative energy inside the bulk. The nucleated bubble expands in the bulk and consequently hits the brane, bringing a hot big-bang brane universe of the Randall-Sundrum type. Here, the termination of the inflationary phase is due to the change of the bulk vacuum energy. The bubble kinetic energy heats up the universe. As a simple realization, we…
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