Tripling Fluctuations and Peaked Sound Speed in Fermionic Matter
Abstract
A crossover involving three-fermion clusters is relevant to the hadron-quark crossover, which, if occurring in a neutron star, could naturally reproduce the dense-matter equation of state recently deduced from simultaneous observations of neutron-star masses and radii. To understand the crossover mechanism, we examine the role of tripling fluctuations induced by the formation of three-fermion clusters. The phase-shift representation of fluctuations manifests an interplay of bound and scattering states, leading to non-monotonic momentum distributions of baryon-like clusters and peaked sound speed at finite densities. We demonstrate them by applying our approach to a nonrelativistic system of one-dimensional three-color fermions analogous to the hadron-quark matter.
Cite
@article{arxiv.2412.04971,
title = {Tripling Fluctuations and Peaked Sound Speed in Fermionic Matter},
author = {Hiroyuki Tajima and Kei Iida and Toru Kojo and Haozhao Liang},
journal= {arXiv preprint arXiv:2412.04971},
year = {2025}
}
Comments
7 pages, 5 figures