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Hamiltonian formalism for the collective fermionic waves in a quark-gluon plasma

Yu. A. Markov, M.A. Markova, N.Yu. Markov

Izvestiya vysshikh uchebnykh zavedenii FizikaDec 1, 20210 citations

Perfect Fluidity: From Strongly-Interacting Fermi Gases to Quark-Gluon Plasmas

John E. Thomas

Bulletin of the American Physical SocietyNov 16, 20120 citations

Transport Properties of Quark–Gluon Plasmas

W. Ebeling, Vladimir Evgenievich Fortov, Vladimir S. Filinov

Springer series in plasma science and technologyJan 1, 20170 citations

Collective Excitations in Fermi and Bose Systems

C. A. Bertulani, L. Felipe Canto, Mahir Saleh Hussein

Jun 17, 19992 citations

Ratio of shear viscosity to entropy density for trapped fermions in the unitarity limit

Thomas Schäfer

We extract the shear viscosity to entropy density ratio $\ensuremath{\eta}/s$ of cold fermionic atoms in the unitarity limit from experimental data on the damping of collective excitations. We find that near the critical temperature $\ensuremath{\eta}/s$ is roughly equal to 1/2 in units of $\ensuremath{\hbar}/{k}_{B}$. With the possible exception of the quark gluon plasma, this value is closer to the conjectured lower bound $1/(4\ensuremath{\pi})$ than any other known liquid.We extract the shear viscosity to entropy density ratio $\ensuremath{\eta}/s$ of cold fermionic atoms in the unitarity limit from experimental data on the damping of collective excitations. We find that near the critical temperature $\ensuremath{\eta}/s$ is roughly equal to 1/2 in units of $\ensuremath{\hbar}/{k}_{B}$. With the possible exception of the quark gluon plasma, this value is closer to the conjectured lower bound $1/(4\ensuremath{\pi})$ than any other known liquid.

arXiv:cond-mat/0701251Physical Review ADec 20, 2007106 citations

Unitary quantum gases: from cold atoms to quark-gluon plasmas

van Heugten

We investigate the many-body properties of two distinct degenerate systems with strong interactions, namely that of a quark-gluon plasma and of an atomic Bose gas. In the first part of this thesis, the temperature dependence of the thermodynamic potential of quantum chromodynamics is studied. In particular, the specific heat and the quark effective mass are calculated for imbalanced quark matter in the limit of a large number of quark flavors (large-Nf), which corresponds to the random phase approximation. Also, a generalization of the Landau effective-mass relation for the imbalanced case within relativistic Landau-Fermi liquid theory is derived. The effects of imbalance is expected to have important consequences on the properties of quark matter in the core of neutron stars. In the second part, we develop an analytical approach for the description of the crossover of an atomic Bose gas from small to infinitely large scattering length (unitarity). We obtain several properties of the Bose gas as a function of interaction strength, such as the chemical potential, the contact, the speed of sound, the condensate density, the effective interatomic interaction and the three-body recombination rate. It is shown how the approach can be systematically improved with renormalization-group methods and that it reduces to the Bogoliubov theory in the weak-coupling limit.We investigate the many-body properties of two distinct degenerate systems with strong interactions, namely that of a quark-gluon plasma and of an atomic Bose gas. In the first part of this thesis, the temperature dependence of the thermodynamic potential of quantum chromodynamics is studied. In particular, the specific heat and the quark effective mass are calculated for imbalanced quark matter in the limit of a large number of quark flavors (large-Nf), which corresponds to the random phase approximation. Also, a generalization of the Landau effective-mass relation for the imbalanced case within relativistic Landau-Fermi liquid theory is derived. The effects of imbalance is expected to have important consequences on the properties of quark matter in the core of neutron stars. In the second part, we develop an analytical approach for the description of the crossover of an atomic Bose gas from small to infinitely large scattering length (unitarity). We obtain several properties of the Bose gas as a function of interaction strength, such as the chemical potential, the contact, the speed of sound, the condensate density, the effective interatomic interaction and the three-body recombination rate. It is shown how the approach can be systematically improved with renormalization-group methods and that it reduces to the Bogoliubov theory in the weak-coupling limit.

Jun 14, 20130 citations

Many-body physics: Collective fermionic excitations in quark–gluon plasmas and cold atom systems

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Many-body physics: Collective fermionic excitations in quark–gluon plasmas and cold atom systems

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