Scalar spectral functions from the spectral fRG
High Energy Physics - Theory
2023-03-30 v1 High Energy Physics - Phenomenology
Abstract
We compute non-perturbative spectral functions in a scalar -theory in three spacetime dimensions via the spectral functional renormalisation group. This approach allows for the direct, manifestly Lorentz covariant computation of correlation functions in Minkowski spacetime, including a physical on-shell renormalisation. We present numerical results for the spectral functions of the two- and four-point correlation functions for different values of the coupling parameter. These results agree very well with those obtained from another functional real-time approach, the spectral Dyson-Schwinger equation.
Keywords
Cite
@article{arxiv.2303.16719,
title = {Scalar spectral functions from the spectral fRG},
author = {Jan Horak and Friederike Ihssen and Jan M. Pawlowski and Jonas Wessely and Nicolas Wink},
journal= {arXiv preprint arXiv:2303.16719},
year = {2023}
}
Comments
22 pages, 13 figures