Thick branes and fermion localization in five-dimensional $f(T,T_G)$ gravity

TL;DR

This paper explores thick-brane models in five-dimensional $f(T,T_G)$ gravity, revealing how torsional corrections influence brane structure and fermion localization, including the emergence of resonant states.

Contribution

It introduces explicit solutions in $f(T,T_G)$ gravity showing how torsional Gauss-Bonnet terms affect brane geometry and fermion localization, a novel aspect in braneworld models.

Findings

T_G term significantly modifies brane structure and energy density.

A normalizable chiral zero mode for fermions exists, opposite chirality is delocalized.

Resonant quasi-localized fermion states are influenced by torsional corrections.

Abstract

We investigate thick-brane configurations in five-dimensional $f(T,T_G)$ modified teleparallel gravity. In five dimensions, the torsional Gauss-Bonnet invariant $T_G$ contributes dynamically, leading to genuinely new effects even at linear order. Within a warped geometry supported by a scalar field, we construct explicit solutions and show that the $T_G$ sector significantly modifies the brane structure. In particular, the coupling parameter controls the deformation of the warp factor and energy density, allowing for the emergence of brane splitting and nontrivial internal structure. We further analyze the localization of spin-$1/2$ fermions via a Yukawa coupling. The system admits a normalizable chiral zero mode, while the opposite chirality remains delocalized. The massive Kaluza-Klein spectrum is strongly affected by the torsional Gauss-Bonnet term, which modifies the effective potentials and leads to the appearance of resonant quasi-localized states.Our results show that $f(T,T_G)$ gravity provides a richer framework for braneworld models, where torsional higher-order corrections play a key role in shaping both geometry and field localization.