A quarkyonic matter model
Abstract
Quarkyonic matter is a state of matter in dense QCD whose bulk thermodynamics is dominated by quarks, while low-energy excitations remain confined. This picture leads to a crossover description from baryonic matter to quark matter, which is triggered by the saturation of quark states in dense matter ({\it quark saturation}). The crossover driven by the quark saturation accompanies rapid growth in pressure but moderate increase in energy density, resulting in a peak in the sound speed which has been indicated by observational constraints from neutron star physics. The quark saturation can occur at a few times nuclear saturation density, which is smaller than the density at which the baryon cores of ∼ 0.5--$0.8$ fm spatially overlap. In this contribution we discuss an ideal model of quarkyonic matter, the IdylliQ model, and we explicitly describe how the baryon and quark occupation probabilities are related, and explain how stiffening of matter occurs. The model is further applied to charge neutral matter including hyperons, and it is shown that the statistical constraints at quark level induce effective repulsion among different baryon species, mitigating the hyperon softening problem in neutron star physics.
Versions
Related
- Effects of Short-Range Correlations on Quarkyonic Matter
- Quarkyonic matter suppresses neutron-star g modes and reverses their mass trend
- Finite-Temperature Axion-Admixed Neutron Stars in a Quarkyonic Crossover Framework
- Cosmological extra dimensions can mimic dark matter I. Dark matter in galaxies
- JWST lensed quasar dark matter survey. IV. Stringent warm dark matter constraints from the joint reconstruction of extended lensed arcs and quasar flux ratios
BibTeX
@misc{kojo2026quarkyonic,
title = {{A quarkyonic matter model}},
author = {Toru Kojo},
howpublished = {arXiv},
year = {2026},
month = jun,
doi = {10.48550/arxiv.2606.00943},
eprint = {2606.00943},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.00943},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - A quarkyonic matter model
AU - Toru Kojo
PY - 2026
DA - 2026/06/01
PB - arXiv
DO - 10.48550/arxiv.2606.00943
UR - https://arxiv.org/abs/2606.00943
AB - Quarkyonic matter is a state of matter in dense QCD whose bulk thermodynamics is dominated by quarks, while low-energy excitations remain confined. This picture leads to a crossover description from baryonic matter to quark matter, which is triggered by the saturation of quark states in dense matter ({\it quark saturation}). The crossover driven by the quark saturation accompanies rapid growth in pressure but moderate increase in energy density, resulting in a peak in the sound speed which has been indicated by observational constraints from neutron star physics. The quark saturation can occur at a few times nuclear saturation density, which is smaller than the density at which the baryon cores of ∼ 0.5--$0.8$ fm spatially overlap. In this contribution we discuss an ideal model of quarkyonic matter, the IdylliQ model, and we explicitly describe how the baryon and quark occupation probabilities are related, and explain how stiffening of matter occurs. The model is further applied to charge neutral matter including hyperons, and it is shown that the statistical constraints at quark level induce effective repulsion among different baryon species, mitigating the hyperon softening problem in neutron star physics.
ER -