Dynamical radion superfield in 5D action

TL;DR

This paper systematically derives a 5D superspace action incorporating a dynamical radion superfield, enabling analysis of radion couplings and mass in stabilized extra-dimensional models.

Contribution

It provides a systematic derivation of the 5D N=1 superspace action with a dynamical radion superfield using superconformal supergravity, including couplings and mass calculation.

Findings

Radion treated as a dynamical field in 5D supergravity

Explicit couplings of radion superfield to matter fields derived

Radion mass obtained from the superspace action

Abstract

We derive 5D N=1 superspace action including the radion superfield. The radion is treated as a dynamical field and identified as a solution of the equation of motion even in the presence of the radius stabilization mechanism. Our derivation is systematic and based on the superconformal formulation of 5D supergravity. We can read off the couplings of the dynamical radion superfield to the matter superfields from our result. The correct radion mass can be obtained by calculating the radion potential from our superspace action.