235 research outputs found
Solitonic d-5 brane and Vortex on the World-Sheet
We examine the behavior of the vortex defects, which are represented by the
sine-Gordon potential, on the world-sheet when a solitonic d-5 brane is
existing in the d-dimensional target space. The d-5 brane solution is obtained
as an extension of 5-brane in 10d supergravity. It is shown that the vortices
of any charge should be dissociated to the free gas when they approach to the
brane. The meanings of this fact are addressed through the analysis of the
renormalization group equations on the world sheet.Comment: 12 pages, Latex, no figur
2D Quantum Gravity Coupled to Renormalizable Matter Fields
We consider two-dimensional quantum gravity coupled to matter fields which
are renormalizable, but not conformal invariant. Questions concerning the \b
function and the effective action are addressed, and the effective action and
the dressed renormalization group equations are determined for various matter
potentials.Comment: 23 pages, Latex, NBI-HE-93-6
Flavor meson localization in 5d braneworld
We propose a brane-world, which contains flavor quarks and mesons, by
embedding dimensionally reduced D7-brane in both the supersymmetric and
non-supersymmetric 5d background which are obtained as the solutions of type
IIB supergravity compactified on Ad. In the supersymmetric case,
the RS brane can be put at any point of the fifth coordinate, but it is pushed
to the Ad boundary in the non-supersymmetric case. We study the
localization of the flavor mesons, the fluctuation-modes of D7-brane, on the
Randall-Sundrum brane in these backgrounds.Comment: 15 pages, 2 figure
Holographic Model at Finite Temperature with -chrage density
We consider a holographic model of QCD at finite temperature with nonzero
chemical potentials conjugate to -charge densities. A critical surface of
the confinement-deconfinement phase transition is shown for five-dimensional
charged black hole solution given by Behrnd, Cveti\v{c} and Sabra. On a special
section of the parameter space, we find an critical curve being similar to the
one expected in QCD. We calculate meson spectra and decay constants in the
confinement phase of this section to see their temperature and chemical
potential dependences. We could assure generalized GellMann-Oakes-Renner
relation and the reduction of pion velocity near the critical point.Comment: 12 pages, 4 figures, Comments are adde
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