# Nuclear Physics Seminar

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Title: Hydrodynamic transport coefficients for the non-conformal quark-gluon plasma from holography

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Jorge Noronha (University of Sao Paulo)

#### Thursday, March 19th, 2015, 10:30 am

Abstract: In this talk I will explain how one can obtain holographic formulas
for the transport coefficients \kappa and \tau_\pi present in the second-order
derivative expansion of relativistic hydrodynamics in curved spacetime associated with
a non-conformal strongly coupled plasma described holographically by an Einstein+Scalar action in the bulk.
We compute these coefficients as functions of the temperature in a bottom-up non-conformal model that
is tuned to reproduce lattice QCD thermodynamics at zero baryon chemical potential. We directly compute,
besides the speed of sound, 6 other transport coefficients that appear at second-order in the derivative expansion.
We also give an estimate for the temperature dependence of 11 other transport coefficients taking into account the
simplest contribution from non-conformal effects that appear near the QCD crossover phase transition. Using these results,
we construct an Israel-Stewart-like theory in flat spacetime containing 13 of these 17 transport coefficients that should be
suitable for phenomenological applications in the context of numerical hydrodynamic simulations of the strongly-coupled,
non-conformal quark-gluon plasma. Using several different approximations, we give parametrizations for the temperature
dependence of all the second-order transport coefficients that appear in this theory in a format that can be easily implemented
in existing numerical hydrodynamic codes.

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Last modified: 10:29 am, October 30, 2015.

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