Insights on the Peak in the Speed of Sound of Ultradense Matter

M. Hippert, E. S. Fraga, J. Noronha

Research output: Contribution to journalArticlepeer-review


In this work we investigate the minimal physical requirements needed for generating a speed of sound that surpasses its asymptotic conformal limit. It is shown that a peak in the speed of sound of homogeneous matter naturally emerges in the transition from a phase with broken chiral symmetry to one with a gapped Fermi surface. We argue that this could be relevant for understanding the peak in the speed of sound displayed by some of the current models for cold ultradense matter. A minimal model implementation of this mechanism is presented, based on the spontaneous breakdown of an approximate particle-antiparticle symmetry, and its thermodynamic properties are determined.

Original languageEnglish (US)
Article number034011
JournalPhysical Review D
Issue number3
StatePublished - Aug 1 2021

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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