2,135 research outputs found
Hybrid Monte Carlo Simulation of Graphene on the Hexagonal Lattice
We present a method for direct hybrid Monte Carlo simulation of graphene on
the hexagonal lattice. We compare the results of the simulation with exact
results for a unit hexagonal cell system, where the Hamiltonian can be solved
analytically.Comment: 5 pages, 4 figure
Simplicial Chiral Models
Principal chiral models on a d-1 dimensional simplex are introduced and
studied analytically in the large limit. The and
models are explicitly solved. Relationship with standard lattice models and
with few-matrix systems in the double scaling limit are discussed.Comment: 6 pages, PHYZZ
Magnetic Monopole Content of Hot Instantons
We study the Abelian projection of an instanton in as a
function of temperature (T) and non-trivial holonomic twist () of the
Polyakov loop at infinity. These parameters interpolate between the circular
monopole loop solution at T=0 and the static 't Hooft-Polyakov
monopole/anti-monopole pair at high temperature.Comment: 3 pages, LATTICE98(confine), LaTeX, PostScript figures include
From Black Holes to Glueballs: The QCD_3 Tensor Glueball at Strong Coupling
A strong coupling calculation of glueball masses based on the duality between
supergravity and Yang-Mills theory is presented. Earlier work is extended to
non-zero spin. Fluctuations in the gravitational metric lead to the 2^{++}
state on the leading Pomeron trajectory with a mass relation: m(0^{++}) <
m(2^{++}) < m(1^{-+}). Contrary to expectation, the mass of our new 0^{++}
state (m^2=5.4573) associated with the graviton is smaller than the mass of the
state (m^2=11.588) from the dilaton, which in fact is exactly
degenerate with the tensor 2^{++}.Comment: 3 pages, 1 figure, Talk at Lattice 99 by R. Browe
Brane World Gravity in an AdS Black Hole
We consider a model of brane world gravity in the context of non-conformal
non-SUSY matter. In particular we modify the earlier strong coupling solution
to the glueball spectrum in an Black Hole by introducing a
Randall-Sundrum Planck brane as a UV cut-off. The consequence is a new
normalizable zero mass tensor state, which gives rise to an effective
Einstein-Hilbert theory of gravity, with exponentially small corrections set by
the mass gap to the discrete glueball spectrum. However the simplest
microscopic theory for the Planck brane is found to have a tachyonic
instability in the radion mode.Comment: 25 pages, late
Diffractive Higgs Production by AdS Pomeron Fusion
The double diffractive Higgs production at central rapidity is formulated in
terms of the fusion of two AdS gravitons/Pomerons first introduced by Brower,
Polchinski, Strassler and Tan in elastic scattering. Here we propose a simple
self-consistent holographic framework capable of providing phenomenologically
compelling estimates of diffractive cross sections at the LHC. As in the
traditional weak coupling approach, we anticipate that several phenomenological
parameters must be tested and calibrated through factorization for a
self-consistent description of other diffractive process such as total cross
sections, deep inelastic scattering and heavy quark production in the central
region.Comment: 53 pages, 8 figure
More on generalized simplicial chiral models
By generalizing the auxiliary field term in the Lagrangian of simplicial
chiral models on a (d-1)-dimensional simplex, the generalized simplicial chiral
models has been introduced in \c{Ali}. These models can be solved analytically
only in d=0 and d=2 cases at large-N limit. In d=0 case, we calculate the
eigenvalue density function in strong regime and show that the partition
function computed from this density function is consistent with one calculated
by path integration directly. In d=2 case, it is shown that all V= {\rm
Tr}(AA^{\d})^n models have a third order phase transition, same as the
2-dimensional Yang-Mills theory.Comment: 11 pages, 1 figur
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