47 research outputs found
Glueballs and the Pomeron
We present our latest results on the glueball spectrum of SU(N) gauge
theories in 2+1 dimensions for spins ranging from 0 to 6 inclusive, as well as
preliminary results for SU(3) in 3+1 dimensions. Simple glueball models and the
relation of the even-spin spectrum to the 'Pomeron' are discussed.Comment: LAT03 proceedings (spectrum), 3 pages, 3 figures, talk by H.Meye
Semiclassical strings on confining backgrounds
This paper discusses some results on semiclassical string configurations
lying in the IR sector of supergravity backgrounds dual to confining gauge
theories. On the gauge theory side, the string states we analyse correspond to
Wilson loops, glueballs and KK-hadrons. The 1-loop correction to the classical
energy is never subleading, but can be viewed as a coupling dependent rescaling
of the dimensionful parameters of the theory.Comment: 11 pages, contribution for the proceedings of the RTN Workshop,
Kolymbari, Crete, Greece, 5-10 Sep 200
Holographic Description of Glueball and Baryon in Noncommutative Dipole Gauge Theory
We study the glueball spectrum in the supersymmetric and non-supersymmetric
4D non-commutative dipole gauge theory from the holographic description. We
adopt the semiclassical WKB approximation to solve the dilaton and
antisymmetric tensor field equations on the dual supergravity backgrounds to
find the analytic formula of the spectrum of and glueballs,
respectively. In the supersymmetric theory we see that the dipole length plays
the intrinsic scale which reflects the discrete spectrum therein. In the
non-supersymmetric theory, the temperature (or the radius of compactification)
in there will now play the intrinsic scale and we see that the dipole has an
effect to produce attractive force between the gluons within the glueball. We
also study the confining force between the quarks within the baryon via strings
that hang into the dipole deformed AdS geometry and see that the dipole could
also produce an attractive force between the quarks. In particular, we find
that the baryon has two phases in which a big baryon is dual to the static
string while a small baryon is described by a moving dual string .Comment: Latex 18 page
Glueballs and the Pomeron
Glueballs are considered to be bound states of constituent gluons.
Relativistic wave equation for two massive gluons interacting by the
funnel-type potential is analyzed. Using two exact asymptotic solutions of the
equation, we derive an interpolating mass formula and calculate glueball masses
in agreement with the lattice data. We obtain the complex non-linear Pomeron
trajectory, , in the whole region of . The real part of the
trajectory corresponds to the soft Pomeron, parameters of which are found from
the fit of recent HERA data.Comment: 6 pages, 1 figure; The X international school-seminar on the actual
problems of microword physics Gomel (Belarus), July 15-16, 200
The Holographic Models of the scalar sector of QCD
We investigate the AdS/QCD duality for the two-point correlation functions of
the lowest dimension scalar meson and scalar glueball operators, in the case of
the Soft Wall holographic model of QCD. Masses and decay constants as well as
gluon condensates are compared to their QCD estimates. In particular, the role
of the boundary conditions for the bulk-to-boundary propagators is emphasized.Comment: Invited talk at the 5th International Conference on Quarks and
Nuclear Physics QNP'09, Beijing, China, 21-26 September 2009. To be published
in Chinese Physics