Brane world generation by matter and gravity

TL;DR

This paper models a 5D universe with matter and gravity, showing how strong interactions lead to brane formation, low-energy physics emergence, and potential dark matter roles, with implications for cosmology.

Contribution

It introduces a novel 5D brane formation mechanism via strong four-fermion interactions and explores its implications for low-energy physics and dark matter.

Findings

Formation of domain walls in 5D due to strong interactions

Decoupling of brane fluctuations from Standard Model matter

Vanishing cosmological constant on the brane

Abstract

We present a non-compact (4 + 1) dimensional model with a local strong four-fermion interaction supplementing it with gravity. In the strong coupling regime it reveals the spontaneous translational symmetry breaking which eventually leads to the formation of domain walls, or thick 3-branes, embedded in the AdS-5 manifold. To describe this phenomenon we construct the appropriate low-energy effective Action and find kink-like vacuum solutions in the quasi-flat Riemannian metric. We discuss the generation of ultra-low-energy (3 + 1) dimensional physics and we establish the relation among the bulk five dimensional gravitational constant, the brane Newton's constants and the curvature of AdS-5 space-time. The plausible relation between the compositeness scale of the scalar matter and the symmetry breaking scale is shown to support the essential decoupling of branons, the scalar fluctuations of the brane, from the Standard Model matter, supporting their possible role in the dark matter saturation. The induced cosmological constant on the brane does vanish due to exact cancellation of matter and gravity contributions.