903 research outputs found
Mesons and nucleons from holographic QCD
We present in this talk a recent investigation on a unified approach within
the framework of a hard-wall model of AdS/QCD. We first study a theoretical
inconsistency in existing models. In order to remove this inconsistency, we
propose a unified approach in which the mesons and the nucleons are treated on
the same footing, the same infrared (IR) cutoff being employed in both
fermionic and bosonic sectors. We also suggest a possible way of improving the
model by introducing a five-dimensional anomalous dimension.Comment: 10 pages, 2 figures. A talk give at the Workshop on "Hadron and
Nuclear Physics (HNP09)" Nov. 16-19, 2009, RCNP, Osaka Universit
Quark Number Susceptibility with Finite Quark Mass in Holographic QCD
We study the effect of a finite quark mass on the quark number susceptibility
in the framework of holographic QCD. We work in a bottom-up model with a
deformed AdS black hole and D3/D7 model to calculate the quark number
susceptibility at finite temperature with/without a finite quark chemical
potential. As expected the finite quark mass suppresses the quark number
susceptibility. We find that at high temperatures MeV the quark
number susceptibility of light quarks and heavy quarks are almost equal in the
bottom-up model. This indicates that the heavy quark like charm contribution to
thermodynamics of a QCD-like system may start to become significant at
temperatures MeV. In D3/D7 model, we focus on the competition
between the quark chemical potential, which enhances the quark number
susceptibility, and the quark mass that suppresses the susceptibility. We
observe that depending on the relative values of the quark mass and the quark
chemical potential, the quark number susceptibility shows a diverging or
converging behavior. We also calculate the chiral susceptibility in D3/D7 model
to support the observation made with the quark number susceptibility.Comment: 16 pages, 3 figure
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