Topological Gravity, the Hierarchy Problem and Axion Physics

TL;DR

This paper explores higher-dimensional topological models related to Randall-Sundrum scenarios, addressing the hierarchy problem and axion physics through topological terms and field theoretic constructs involving domain walls and torsion.

Contribution

It introduces new higher-dimensional topological models with domain walls that mimic branes, connecting topological gravity, hierarchy problem, and axion physics in a unified framework.

Findings

Generalized topological terms for D>4 involving axion-photon coupling.

Dimensional reduction yields novel B∧F and B∧∂φ terms in lower dimensions.

Models provide insights into neutrino and axion physics within higher-dimensional theories.

Abstract

In the last years higher dimensional physics has won importance. Despite the Superstrings, higher dimensional effects, in measurable scales of energy (some TeV), became only possible with Randall-Sundrum's models (RS). In particular, recent studies in neutrino and axion physics have proposed new and interesting questions about neutrino mixings and new scales intermediating the Weak and Planck scales. In this work we discuss field theoretic models that in some aspects are similar to the RS models. Indeed, our models contain domain walls, solitonic-like objects that mimics the branes of the RS models. Applications are discussed ranging from topological field theories in higher dimensions until models containing D=5 space-time torsion in the RS scenario. In particular, we talk about subjects related to topological gravity, the hierarchy problem and axion physics. The topological terms studied are generalizations for $D>4$ of the axion-foton coupling in D=4. Such procedure involves naturally the Kalb-Ramond field. By dimensional reductions we obtain topological terms of the $B\wedge F$ type in D=4 Chern-Simons-like and $B\wedge\partial\phi$ type both in D=3.