We investigate the properties of the quark-antiquark mesons at zero and finite temperature in the framework of a solvable chiral quark model with linear confining potential. We demonstrate that while the confining interaction induces spontaneous breaking of chiral symmetry at T=0, chiral symmetry gets restored at some finite critical temperature. A crucial property of the confined meson-like quark-antiquark states above this critical temperature is their size that exceeds drastically that in the chirally broken phase below the critical temperature. This property is a result of Pauli blocking of the quark and antiquark levels with small momenta. We consider these results as the first step in microscopic investigations of the properties of the hot QCD matter.

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Dr. Nefediev is holding a PIFI visiting scientist fellowship. He works mainly on theoretical studies in hadronic physics, analysis and interpretation of the experimental and lattice data, prediction of new hadronic states and their properties, and so on. He obtained his PhD degree in 1999 at the Institute of Theoretical and Experimental Physics (Moscow, Russia). From 2000 to 2002, he was a postdoctoral researcher at the Instituto Superior Tecnico (Lisbon, Portugal). From 2002, he took a permanent position as a Senior Scientist at the Institute for Theoretical and Experimental Physics (Moscow). In 2017, he obtained his second scientific degree adopted in Russia, Doctor of Sciences (habilitation). In 2018, he occupied a permanent position as a Leading Scientist at P.N.Lebedev Institute of the Russian Academy of Sciences (Moscow). From 2022 to 2024, he held the position of a Scientific Advisor at the Institute Josef Stefan, Ljubljana, Slovania. Since Sept. 2024, he works at the University of Bonn.

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郭奉坤 研究员