362 research outputs found
Thermodynamics of 5D dilaton-gravity
We calculate the free energy, spatial string tension and Polyakov loop of the
gluon plasma using the dilaton potential of Ref. arXiv:0911.0627[hep-ph] in the
dilaton-gravity theory of AdS/QCD. The free energy is computed from the Black
Hole solutions of the Einstein equations in two ways: first, from the
Bekenstein-Hawking proportionality of the entropy with the area of the horizon,
and secondly from the Page-Hawking computation of the free energy. The finite
temperature behaviour of the spatial string tension and Polyakov loop follow
from the corresponding string theory in AdS_5. Comparison with lattice data is
made.Comment: 3 pages, 3 figures. Talk given at the IX International Conference on
Quark Confinement and the Hadron Spectrum (QCHS9), Madrid, Spain, 30 Aug. - 3
Sep. 201
Correlation between conserved charges in PNJL Model with multi-quark interactions
We present a study of correlations among conserved charges like baryon
number, electric charge and strangeness in the framework of 2+1 flavor Polyakov
loop extended Nambu-Jona-Lasinio model at vanishing chemical potentials, up to
fourth order. Correlations up to second order have been measured in Lattice QCD
which compares well with our estimates given the inherent difference in the
pion masses in the two systems. Possible physical implications of these
correlations and their importance in understanding the matter obtained in
heavy-ion collisions are discussed. We also present comparison of the results
with the commonly used unbound effective potential in the quark sector of this
model
Susceptibilities with multi-quark interactions in PNJL model
We have investigated the fluctuations and the higher order susceptibilities
of quark number, isospin number, electric charge and strangeness at vanishing
chemical potential for 2+1 flavor Polyakov loop extended Nambu--Jona-Lasinio
model. The calculations are performed for the bound effective potential in the
quark sector requiring up to eight quark interaction terms. These have been
contrasted to the lattice results which currently have somewhat heavier quarks
in the light flavor sector. The results show sufficient qualitative agreement.
For comparison we also present the results obtained with the conventional
effective potential containing upto six quark interaction terms.Comment: To appear Physical Review
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