Speaker
Pasi Huovinen
(Johann Wolfgang Goethe-Universität)
Description
The effects of non-zero baryon density are expected to become
important in hydrodynamic modeling of heavy collisions below the
highest energy at RHIC. Recent calculations in effective models and in
QCD using Dyson Schwinger equation suggest that the transition in QCD
remains a crossover up to baryon chemical potentials of about 800MeV [1].
If so, the equation of state relevant for hydrodynamic models can be
calculated on the lattice using Taylor expansion. However, except for
the coefficients of the lowest order, there are large cutoff effects
in present lattice calculations for non-zero chemical potentials.
To extend our previous parametrization of the equation of state [2] to
finite baryon density, we employ the continuum extrapolated lattice
QCD data on Taylor expansion coefficients in order two [3], and
complement them with coefficients in order four and six evaluated
using p4 action [4]. To avoid large cutoff efects these coefficients
are smoothly matched to those of hadron resonance gas at low
temperature. Some preliminary results were reported in [5]. We also
show how the hydrodynamical evolution is affected by this equation of
state in the energy range relevant for SPS and the RHIC energy scan.
[1] T.K. Herbst et al, Phys. Lett. B696 (2011);
C.S. Fischer et al, Phys. Lett. B702 (2011)
[2] P.Huovinen and P.Petreczky, Nucl.Phys. A837 (2010) 26
[3] S. Borsanyi et al, JHEP 1208 (2012) 053;
A. Bazavov et al, Phys. Rev. D86 (2012) 034509
[4] M. Cheng et al, Phys. Rev. D79 (2009) 074505;
C Miao and C. Schmidt, PoS LATTICE2008 (2008) 172
[5] P. Huovinen, P. Petreczky and C. Schmidt,
Central Eur. J. Phys. 10, (2012) 1385
| On behalf of collaboration: | None |
|---|
Author
Pasi Huovinen
(Johann Wolfgang Goethe-Universität)
Co-authors
Christian Schmidt
(University of Bielefeld)
Peter Petreczky
(BNL)
