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Soft Interactions in Cold Quark Matter.

Tyler Gorda^1,2, Aleksi Kurkela³, Risto Paatelainen⁴

¹Technische Universität Darmstadt, Department of Physics, D-64289 Darmstadt, Germany.

Physical Review Letters

|November 1, 2021

Summary

This summary is machine-generated.

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This study advances understanding of dense quark matter, crucial for neutron stars. New calculations reduce uncertainties in the quark matter equation of state at high densities.

Area of Science:

Nuclear Physics
Quantum Chromodynamics (QCD)
Astrophysics

Background:

Accurate thermodynamic properties of zero-temperature, high-density quark matter are essential for understanding neutron-star cores.
The behavior of dense QCD matter inside neutron stars depends on its equation of state.

Purpose of the Study:

To compute the next-to-next-to-next-to-leading-order contribution to the dense QCD equation of state.
To investigate the role of non-Abelian interactions in quark matter at high densities.

Main Methods:

Utilizing the weak-coupling expansion of the dense QCD equation of state.
Employing all-loop resummation via hard-thermal-loop (HTL) approximations.
Performing a two-loop computation within the HTL effective theory for soft modes.

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Main Results:

The soft sector of cold quark matter is well-behaved, unlike at high temperatures.
The new contribution reduces the renormalization-scale dependence of the equation of state at high density.

Conclusions:

The study provides a more constrained equation of state for dense quark matter.
Findings contribute to a better understanding of matter within neutron-star cores.