Radiative Corrections with 5D Mixed Position-/Momentum-space Propagators

TL;DR

This paper explores a mixed position-/momentum-space propagator method for calculating radiative corrections in 5D theories with compactified dimensions, offering advantages in separating divergences and finite corrections.

Contribution

It demonstrates the application of mixed propagators to compute one-loop self-energy corrections in 5D models on different compactified manifolds, highlighting its utility.

Findings

Effective separation of UV divergences from finite winding corrections

Simplified calculations using mixed propagators in 5D theories

Application to models on S_1 and S_1/Z_2 orbifolds

Abstract

In higher dimensional field theories with compactified dimensions there are three standard ways to do perturbative calculations: i) by the summation over Kaluza-Klein towers; ii) by the summation over winding numbers making use of the Poisson-resummation formula and iii) by using mixed propagators, where the coordinates of the four infinite dimensions are Fourier-transformed to momentum space while those of the compactified dimensions are kept in configuration space. The third method is broadly used in finite temperature field theory calculations. One of its advantage is that one can easily separate the ultraviolet divergent terms of the uncompactified theory from the non-local finite corrections arising from windings around the compact dimensions. In this note we demonstrate the use of this formalism by calculating one-loop self-energy corrections in a 5D theory formulated on the manifold M_4 \otimes S_1 and on the orbifold M_4 \otimes S_1/Z_2.