633 citations · 2.1k across the 47 of their papers we have counts for
7 papers · 1 filter
Time Dependent Effective Actions at Finite Temperature
T. S. Evans
I study derivative expansions of effective actions at finite temperature, illustrating how the standard methods are badly defined at finite temperature. I then show that by setting…
An Optimised Perturbation Expansion For a Global O(2) Theory
T. S. Evans, M. Ivin, M. Mobius
We use an optimised perturbation expansion called the linear delta-expansion to study the phase transition in a Higgs sector with a continuous symmetry and large couplings. Our res…
An Analytical Approach to Lattice Gauge-Higgs Models
T. S. Evans, H. F. Jones, A. Ritz
We describe an application of the linear $\de$-expansion to the calculation of correlation functions in SU(2)-Higgs lattice gauge theory. A significant advantage of the technique i…
The Condensed Matter Limit of Relativistic QFT
T. S. Evans
I study how to apply relativistic quantum field theory to condensed matter systems. The motivation for this is examined and then two separate elements are considered. First we iden…
Vortex Production in Non-Relativistic and Relativistic Media
T. S. Evans, A. J. Gill, R. J. Rivers
We examine string (vortex) formation at a quench for a weakly-coupled global U(1) theory when the excitation spectrum is non-relativistic. It is so similar to vortex production in…
A New Time Contour for Thermal Field Theories
T. S. Evans
A new time contour is used to derive real-time thermal field theory. Unlike previous path integral approaches, no contributions to the generating functional are dropped.