Diagonal Kaluza-Klein expansion under brane localized potential

TL;DR

This paper investigates how boundary-localized potentials in extra-dimensional models affect the vacuum expectation value and wave-function profiles of bulk scalar fields, with implications for Kaluza-Klein expansions and electroweak precision parameters.

Contribution

It provides a detailed analysis of the Kaluza-Klein expansion of bulk fields with boundary potentials, including perturbative treatment and impact on the $ ho$ parameter in orbifold compactifications.

Findings

Boundary-localized potentials modify the scalar VEV and KK mode profiles.

The $ ho$ parameter remains unaffected by brane-localized potentials.

The KK expansion can be computed perturbatively treating boundary potentials as small.

Abstract

We clarify and study our previous observation that, under a compactification with boundaries or orbifolding, vacuum expectation value of a bulk scalar field can have different extra-dimensional wave-function profile from that of the lowest Kaluza-Klein mode of its quantum fluctuation, under presence of boundary-localized potentials which would be necessarily generated through renormalization group running. For concreteness, we analyze the Universal Extra Dimension model compactified on orbifold $S^1/Z_2$, with brane-localized Higgs potentials at the orbifold fixed points. We compute the Kaluza-Klein expansion of the Higgs and gauge bosons in an $R_\xi$-like gauge by treating the brane-localized potential as a small perturbation. We also check that the $\rho$ parameter is not altered by the brane localized potential.