The light Roberge-Weiss tricritical endpoint at imaginary isospin chemical potential

TL;DR

This paper investigates how imaginary isospin chemical potential affects the Roberge Weiss tricritical endpoint, with implications for simplifying chiral extrapolations in lattice QCD studies.

Contribution

It provides new insights into the shift of the tricritical mass due to imaginary isospin chemical potential and explores the dynamics of Polyakov loop clusters across the RW transition.

Findings

Imaginary isospin chemical potential shifts the tricritical mass.

Polyakov loop cluster dynamics are characterized across the RW transition.

Results suggest potential for less computationally intensive chiral extrapolations.

Abstract

We discuss results for the Roberge Weiss (RW) phase transition at nonzero imaginary baryon and isospin chemical potentials, in the plane of temperature and quark masses. Our study focuses on the light tricritical endpoint which has already been used as a starting point for extrapolations aiming at the chiral limit at vanishing chemical potentials. In particular, we are interested in determining how imaginary isospin chemical potential shifts the tricritical mass with respect to earlier studies at zero imaginary isospin chemical potential. A positive shift might allow one to perform the chiral extrapolations from larger quark mass values, therefore making them less computationally expensive. We also present results for the dynamics of Polyakov loop clusters across the RW phase transition.