Equation of state at neutron-star densities and beyond from perturbative QCD
Abstract
We explore the consequences of imposing robust thermodynamic constraints arising from perturbative Quantum Chromodynamics (QCD) when inferring the dense-matter equation-of-state (EOS). We find that the termination density, up to which the EOS modeling is performed in an inference setup, strongly affects the constraining power of the QCD input. This sensitivity in the constraining power arises from EOSs that have a specific form, with drastic softening immediately above the termination density followed by a strong stiffening. We also perform explicit modeling of the EOS down from perturbative-QCD densities to construct a new QCD likelihood function that incorporates additional perturbative-QCD calculations of the sound speed and is insensitive to the termination density, which we make publicly available.
Keywords
Cite
@article{arxiv.2312.14127,
title = {Equation of state at neutron-star densities and beyond from perturbative QCD},
author = {Oleg Komoltsev and Rahul Somasundaram and Tyler Gorda and Aleksi Kurkela and Jérôme Margueron and Ingo Tews},
journal= {arXiv preprint arXiv:2312.14127},
year = {2024}
}
Comments
16 pages, 11 figures. Version 2: added Appendix A, corrected minor error in the marginalization code that introduced small noise in results; updated figures accordingly. The link to the publicly available Marginalized QCD likelihood function https://doi.org/10.5281/zenodo.10592568