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<p>We unveil the impact of the <i>θ</i>-angle on the QCD phase diagram at nonzero isospin and strangeness chemical potentials for three light flavors and different quark mass ratios. We establish the phase boundaries as well as the nature of the associated phase transitions. The order parameters and the physical spectrum in the different phases are determined. We further elucidate the physics around <i>θ</i> = <i>π</i> where we discover a novel parity-preserving superfluid phase. Finally, we comment on Dashen’s phenomenon in the superfluid phases when varying the number of light flavors.</p>

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On the θ-angle physics of QCD under pressure: the strange and isospin phase diagram

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月25日

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  • Jahmall Bersini,
  • Alessandra D’Alise,
  • Clelia Gambardella,
  • Francesco Sannino

摘要

We unveil the impact of the θ-angle on the QCD phase diagram at nonzero isospin and strangeness chemical potentials for three light flavors and different quark mass ratios. We establish the phase boundaries as well as the nature of the associated phase transitions. The order parameters and the physical spectrum in the different phases are determined. We further elucidate the physics around θ = π where we discover a novel parity-preserving superfluid phase. Finally, we comment on Dashen’s phenomenon in the superfluid phases when varying the number of light flavors.