60,548 research outputs found
Scaling, domains, and states in the four-dimensional random field Ising magnet
The four dimensional Gaussian random field Ising magnet is investigated
numerically at zero temperature, using samples up to size , to test
scaling theories and to investigate the nature of domain walls and the
thermodynamic limit. As the magnetization exponent is more easily
distinguishable from zero in four dimensions than in three dimensions, these
results provide a useful test of conventional scaling theories. Results are
presented for the critical behavior of the heat capacity, magnetization, and
stiffness. The fractal dimensions of the domain walls at criticality are
estimated. A notable difference from three dimensions is the structure of the
spin domains: frozen spins of both signs percolate at a disorder magnitude less
than the value at the ferromagnetic to paramagnetic transition. Hence, in the
vicinity of the transition, there are two percolating clusters of opposite
spins that are fixed under any boundary conditions. This structure changes the
interpretation of the domain walls for the four dimensional case. The scaling
of the effect of boundary conditions on the interior spin configuration is
found to be consistent with the domain wall dimension. There is no evidence of
a glassy phase: there appears to be a single transition from two ferromagnetic
states to a single paramagnetic state, as in three dimensions. The slowing down
of the ground state algorithm is also used to study this model and the links
between combinatorial optimization and critical behavior.Comment: 13 pages, 16 figure
Effects of the CP Odd Dipole Operators on Gluino Production at Hadron Colliders
We present the cross sections for the hadroproduction of gluinos by taking
into account the CP odd dipole operators in supersymmetric QCD. The dependence
of the cross sections on these operators is analyzed for the hadron colliders
the Tevatron (=1.8 TeV) and the Cern LHC (=14 TeV). The
enhancement of the hadronic cross section is obviously mass dependent and for a
500 GeV gluino, is up to 16 % (over 73 pb) at the LHC while it is 8 % (over
0.63 fb) at the Tevatron.Comment: 13 pages, 6 figures and 4 table
Single and pair production of heavy leptons in model
We investigate the single and pair production of new heavy leptons via string
inspired model at future linear colliders. Signal and corresponding
backgrounds for these leptons are studied. We have found that single production
of heavy leptons is more relevant than that of pair production, as expected.
For a maximal mixing value of 0.1, the upper mass limits of 2750 GeV in the
single case and 1250 GeV in the pair production case are obtained at
TeV collider option.Comment: 14 pages, 10 figure
Repository case history: University of Strathclyde Strathprints
Case history from the managers of an established repository, to be collected by the conference for sharing among the community of repository managers
GERT EXCLUSIVE-OR combining paths and loops of electrical networks
Program takes a network with multi-parameter branches and reduces it to a network having a single branch connecting source nodes to sink nodes. The program calculates probability, expected time, and variance in the time to go from each source node to each sink node of the GERT network
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