Quarkyonic matter and hadron-quark crossover from an ultracold atom perspective
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866916022157574144 |
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| author | Tajima, Hiroyuki Iida, Kei Kojo, Toru Liang, Haozhao |
| author_facet | Tajima, Hiroyuki Iida, Kei Kojo, Toru Liang, Haozhao |
| contents | The dense matter equation of state is of great interest due to the recent development of astrophysical observations for neutron stars. A rapid increase in pressure indicates a continuous crossover from a hadron phase to a quark phase without any phase transitions, yet its microscopic mechanism remains elusive. Recently, a peak in the speed of sound and a baryon momentum-shell structure, which are predicted from a quarkyonic matter picture, have been regarded as key features of the hadron-quark crossover. In this work, we explore a field-theoretical framework to describe the hadron-quark crossover, drawing an analogy with the Bose-Einstein condensate to Bardeen-Cooper-Schrieffer (BEC-BCS) crossover established in ultracold atomic experiments. Strikingly, a peak in the speed of sound and the baryon momentum-shell structure can simultaneously be explained by the tripling fluctuation effect arising from a different context of quantum many-body physics. We demonstrate these properties in a simplified model and provide a microscopic derivation of the quarkyonic matter model within our field-theoretical framework. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_14113 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quarkyonic matter and hadron-quark crossover from an ultracold atom perspective Tajima, Hiroyuki Iida, Kei Kojo, Toru Liang, Haozhao Nuclear Theory High Energy Astrophysical Phenomena Quantum Gases Superconductivity High Energy Physics - Phenomenology The dense matter equation of state is of great interest due to the recent development of astrophysical observations for neutron stars. A rapid increase in pressure indicates a continuous crossover from a hadron phase to a quark phase without any phase transitions, yet its microscopic mechanism remains elusive. Recently, a peak in the speed of sound and a baryon momentum-shell structure, which are predicted from a quarkyonic matter picture, have been regarded as key features of the hadron-quark crossover. In this work, we explore a field-theoretical framework to describe the hadron-quark crossover, drawing an analogy with the Bose-Einstein condensate to Bardeen-Cooper-Schrieffer (BEC-BCS) crossover established in ultracold atomic experiments. Strikingly, a peak in the speed of sound and the baryon momentum-shell structure can simultaneously be explained by the tripling fluctuation effect arising from a different context of quantum many-body physics. We demonstrate these properties in a simplified model and provide a microscopic derivation of the quarkyonic matter model within our field-theoretical framework. |
| title | Quarkyonic matter and hadron-quark crossover from an ultracold atom perspective |
| topic | Nuclear Theory High Energy Astrophysical Phenomena Quantum Gases Superconductivity High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2602.14113 |