Improving the cold quark-matter pressure via soft interactions at N3LO

TL;DR

This paper discusses the calculation of higher-order corrections to the pressure of cold quark matter, emphasizing the role of soft gluon interactions at N3LO, which improve the convergence of the equation of state.

Contribution

It provides detailed computation of N3LO soft gluon interactions affecting cold quark matter pressure, enhancing theoretical precision.

Findings

Soft gluon interactions at N3LO contribute to the pressure.

Inclusion of these interactions improves the convergence of the equation of state.

The detailed calculation methodology is summarized.

Abstract

The propagation of long-wavelength gluons through a dense QCD medium at high baryon chemical potential mu_B is qualitatively modified by the effects of screening, arising from scatterings off the high-momentum quarks in the medium. This same screening phenomenon also impacts gluons occurring in loop corrections to the pressure of cold quark matter, leading to contributions from the parametric scale Sqrt(alpha_s)*mu_B, starting at next-to-next-to-leading order (N2LO) in the strong coupling constant alpha_s. At next-to-next-to-next-to-leading order (N3LO), interactions between these long-wavelength gluonic modes contribute to the pressure. These interaction corrections have recently been computed in arXiv:2103.07427 and arXiv:2103.05658, and the inclusion of these interactions slightly improves the convergence of the equation of state of cold quark matter. In these proceedings, we present these results and provide details summarizing how this lengthy calculation was performed.