Massimo Mannarelli

Nonperturbative heavy-quark diffusion in the quark-gluon plasma.

We evaluate heavy-quark (HQ) transport properties in a quark-gluon plasma (QGP) within a Brueckner many-body scheme employing interaction potentials extracted from thermal lattice QCD. The in-medium T matrices for elastic charm- and bottom-quark scattering off light quarks in the QGP are dominated by attractive meson and diquark channels which support resonance states up to temperatures of ~1.5T(c). The resulting drag coefficient increases with decreasing temperature, contrary to expectations based on perturbative QCD scattering. Employing relativistic Langevin simulations we compute HQ spectra and elliptic flow in sqrt[s(NN)]=200 GeV Au-Au collisions. A good agreement with electron decay data supports our nonperturbative computation of HQ diffusion, indicative for a strongly coupled QGP.

Bulk viscosities for cold Fermi superfluids close to the unitary limit

We compute the coefficients of bulk viscosity for a nonrelativistic superfluid corresponding to a fermionic system close to the unitarity limit. We consider the low temperature regime assuming that the transport properties of the system are dominated by phonons. To compute the coefficients of bulk viscosity we use kinetic theory in the relaxation time approximation and the low energy effective field theory of the corresponding system. We show that the three independent bulk viscosity coefficients,

Mutual friction in a cold color-flavor-locked superfluid and r-mode instabilities in compact stars.

{ensuremath{zeta}}_{1},{ensuremath{zeta}}_{2},{ensuremath{zeta}}_{3}

Bulk viscosities of a cold relativistic superfluid: Color-flavor locked quark matter

, associated with irreversible flows vanish for phonons with a linear dispersion law. Considering a phonon dispersion law with a cubic term in momentum we find that in the conformal limit

Chromohydrodynamical instabilities induced by relativistic jets

{ensuremath{zeta}}_{1}={ensuremath{zeta}}_{2}=0

Scrutinizing the pion condensed phase

, while

Electromagnetic signals from bare strange stars

{ensuremath{zeta}}_{3}

Jet-induced gauge field instabilities in the quark-gluon plasma: A kinetic theory approach

is nonzero. Including a conformal breaking term that arises for a large but finite

T-matrix approach to heavy quark diffusion in the QGP

s

Transport theory for cold relativistic superfluids from an analogue model of gravity

-wave scattering length,