10 research outputs found
The Quark Gluon Pion Plasma
While it is commonly believed that there is a {\it direct} transition from
the hadronic to a quark gluon phase at high temperature, it would be
prejudicial to rule out a sequence of dynamically generated intermediate
scales. Using as guide, an effective lagrangian with unconfined gluons and
constituent quarks, interacting with a chiral multiplet, we examine a scenario
in which the system undergoes first-order transitions at , the
compositeness scale of the pions, at , the scale for spontaneous
chiral symmetry breaking, and at , the confinement temperature.
We find that at current energies, it is likely that the formation temperature
of the plasma, , and that this is therefore a quark gluon
pion plasma (QGPP) rather than the usual quark gluon plasma (QGP). We propose
some dilepton-related signatures of this scenario.Comment: Rewritten, new figure
Evolving Lorentzian Wormholes
Evolving Lorentzian wormholes with the required matter satisfying the Energy
conditions are discussed. Several different scale factors are used and the
corresponding consequences derived. The effect of extra, decaying (in time)
compact dimensions present in the wormhole metric is also explored and certain
interesting conclusions are derived for the cases of exponential and
Kaluza--Klein inflation.Comment: 10 pages( RevTex, Twocolumn format), Two figures available on request
from the first author. transmission errors corrected
Fast Algorithms For Josephson Junction Arrays : Bus--bars and Defects
We critically review the fast algorithms for the numerical study of
two--dimensional Josephson junction arrays and develop the analogy of such
systems with electrostatics. We extend these procedures to arrays with
bus--bars and defects in the form of missing bonds. The role of boundaries and
of the guage choice in determing the Green's function of the system is
clarified. The extension of the Green's function approach to other situations
is also discussed.Comment: Uuencoded 1 Revtex file (11 Pages), 3 Figures : Postscript Uuencode
Resonances in the transmission of massless scalar waves in a class of wormholes
The propagation of massless, minimally coupled scalar waves in the curved backgrounds of a one-parameter family of wormhole geometries is investigated using numerical methods. The transmission coefficient as a function of the energy of the scalar wave exhibits distinct resonances dependent on the value of the parameter which specifies the geometry