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Stochastic field evolution of disoriented chiral condensates
I present a summary of recent work \cite{BRS} where we describe the
time-evolution of a region of disoriented chiral condensate via Langevin field
equations for the linear model. We analyze the model in equilibrium,
paying attention to subtracting ultraviolet divergent classical terms and
replacing them by their finite quantum counterparts. We use results from
lattice gauge theory and chiral perturbation theory to fix nonuniversal
constants. The result is a ultraviolet cutoff independent theory that
reproduces quantitatively the expected equilibrium behavior of pion and
quantum fields. We also estimate the viscosity , which
controls the dynamical timescale in the Langevin equation, so that the near
equilibrium dynamical response agrees with theoretical expectations.Comment: 3 pages, 3 figures, contribution to the proceedings of Lattice0
Brane World Cosmic String Interaction
It is shown that brane world gravity produces an attractive force between
cosmic strings, in contrast to conventional Einstein gravity. This force is
sufficient for stable bound states of Type II strings (which normally repel
each other) to form. There is a small separation between the strings, giving
them a rope-like structure. At astronomical scales these `cosmic ropes'
resemble higher winding number strings, and so all brane world cosmic strings
are effectively Type I.Comment: 5 page
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