SciPost Phys. Core 2, 002 (2020) ·
published 20 February 2020

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Since the incident nuclei in heavyion collisions do not carry strangeness,
the global net strangeness of the detected hadrons has to vanish. We
investigate the impact of strangeness neutrality on the phase structure and
thermodynamics of QCD at finite baryon and strangeness chemical potential. To
this end, we study the lowenergy sector of QCD within a Polyakov loop enhanced
quarkmeson effective theory with 2+1 dynamical quark flavors. Nonperturbative
quantum, thermal, and density fluctuations are taken into account with the
functional renormalization group. We show that the impact of strangeness
neutrality on thermodynamic quantities such as the equation of state is
sizable.
SciPost Phys. Core 2, 001 (2020) ·
published 4 February 2020

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We investigate the groundstate energy of a RichardsonGaudin integrable BCS model, generalizing the closed and open p+ip models. The Hamiltonian supports a family of mutually commuting conserved operators satisfying quadratic relations. From the eigenvalues of the conserved operators we derive, in the continuum limit, an integral equation for which a solution corresponding to the
ground state is established. The energy expression from this solution agrees with the BCS meanfield result.