Work

Scalar spectral functions from the spectral functional renormalization group

Year: 2024

Type: article

Abstract: We compute spectral functions in a scalar ϕ 4 -theory in three spacetime dimensions via the spectral functional renormalization group. This approach allows for the direct, manifestly Lorentz covariant computation of correlation functions in Minkowski spacetime, including a physical on-shell renormalization. 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. Published by the American Physical Society 2024

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.110.056009

Authors: Jan Horak, Friederike Ihssen, Jan M. Pawlowski, Jonas Wessely, Nicolas Wink

Institutions: Heidelberg University, ExtreMe Matter Institute EMMI, Technische Universität Darmstadt

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Strong, Deutsche Forschungsgemeinschaft, Studienstiftung des Deutschen Volkes