Insights on the peak in the speed of sound of ultradense matter. (arXiv:2105.04535v2 [nucl-th] UPDATED)
<a href="http://arxiv.org/find/nucl-th/1/au:+Hippert_M/0/1/0/all/0/1">Maur&#xed;cio Hippert</a>, <a href="http://arxiv.org/find/nucl-th/1/au:+Fraga_E/0/1/0/all/0/1">Eduardo S. Fraga</a>, <a href="http://arxiv.org/find/nucl-th/1/au:+Noronha_J/0/1/0/all/0/1">Jorge Noronha</a>

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.

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.

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