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20–24 Jan 2020
Bormio, Italy
Europe/Berlin timezone

The BEC-BCS crossover and the Dirac spectrum in QCD at nonzero isospin asymmetry

23 Jan 2020, 18:00
20m
Bormio, Italy

Bormio, Italy

Short Contribution Thursday Afternoon

Speaker

Dr Francesca Cuteri (Goethe Universität)

Description

We investigate the complex spectrum of the massive Dirac operator in 2+1-flavor QCD, at nonzero temperature and isospin chemical potential, using the extension of the Banks-Casher relation to the case of Complex Dirac eigenvalues (derived for the zero-temperature, high-density limits of QCD at nonzero isospin chemical potential), as a prescription to obtain information on the BCS gap from the 2d density of the complex Dirac eigenvalues.
Such study is motivated by the prediction, from perturbation theory, of a superfluid state of u and d¯ Cooper pairs (BCS phase) at asymptotically high isospin densities, plausibly connected via an analytical crossover to the a phase with Bose-Einstein condensation of charged pions at μI>=mπ/2.
Further motivation comes from recent lattice observations (renormalized Polyakov loop measurements) that indicate a decrease of the deconfinement transition temperature as a function of \mu_I, suggesting that the deconfinement crossover smoothly penetrates into the pion condensation phase and thus favoring a scenario where the deconfinement transition connects continuously to the BEC-BCS crossover in the (T,μI) phase diagram.

Topic Heavy Ion Physics

Authors

Dr Bastian Brandt (Goethe Universität) Dr Francesca Cuteri (Goethe Universität) Dr Gergely Endrödi (Goethe Universität) Sebastian Schmalzbauer (Goethe Universität)

Presentation materials