QCD thermodynamics through the crossover as a gas of confining strings with repulsive interactions
Abstract
We investigate QCD thermodynamics in the intermediate-temperature regime using a gas of confining strings supplemented by excluded volume (EV) corrections. In this description, the discrete hadron resonance spectrum is replaced by an exponentially growing open-string spectrum characterized by a Hagedorn temperature TH, related to the confining string tension. With a common EV parameter shared by mesons and baryons, the model gives a good description of bulk lattice-QCD thermodynamics above the pseudocritical temperature. Among the values considered, TH ≃ 300 MeV provides the best agreement, lower than the value TH ≃ 320 − 340 MeV inferred from ideal-string-gas fits to the vacuum hadron spectrum. A simultaneous calibration of the mesonic and baryonic EV parameters gives bM ≃ 0.19 fm3 and bB ≃ 0.73 fm3. Within the present spectral ansatz, the larger baryonic EV parameter indicates that stronger effective suppression is required in the baryon sector, although noticeable tensions remain in several conserved-charge observables.
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BibTeX
@misc{fujimoto2026thermodynamics,
title = {{QCD thermodynamics through the crossover as a gas of confining strings with repulsive interactions}},
author = {Yuki Fujimoto and Volodymyr Vovchenko},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.23292},
eprint = {2609.23292},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.23292},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - QCD thermodynamics through the crossover as a gas of confining strings with repulsive interactions
AU - Yuki Fujimoto
AU - Volodymyr Vovchenko
PY - 2026
DA - 2026/09/20
PB - arXiv
DO - 10.48550/arxiv.2609.23292
UR - https://arxiv.org/abs/2609.23292
AB - We investigate QCD thermodynamics in the intermediate-temperature regime using a gas of confining strings supplemented by excluded volume (EV) corrections. In this description, the discrete hadron resonance spectrum is replaced by an exponentially growing open-string spectrum characterized by a Hagedorn temperature T_H, related to the confining string tension. With a common EV parameter shared by mesons and baryons, the model gives a good description of bulk lattice-QCD thermodynamics above the pseudocritical temperature. Among the values considered, T_H ≃ 300 MeV provides the best agreement, lower than the value T_H ≃ 320 − 340 MeV inferred from ideal-string-gas fits to the vacuum hadron spectrum. A simultaneous calibration of the mesonic and baryonic EV parameters gives b_M ≃ 0.19 fm^3 and b_B ≃ 0.73 fm^3. Within the present spectral ansatz, the larger baryonic EV parameter indicates that stronger effective suppression is required in the baryon sector, although noticeable tensions remain in several conserved-charge observables.
ER -