Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2011-03-08
Phys.Rev.D83:103525,2011
Physics
High Energy Physics
High Energy Physics - Theory
11 pages, 5 figures, improved transverse collisions, accepted for publication in Physical Review D
Scientific paper
10.1103/PhysRevD.83.103525
We study the dynamics of strings by means of a distribution function f(A, B, x, t) defined on a 9+1D phase space, where A and B are the correlation vectors of right- and left-moving waves. We derive a transport equation (an analogous to Boltzmann transport equation for particles) that governs the evolution of long strings with Nambu-Goto dynamics as well as reconnections taken into account. We also derive a system of coupled transport equations (an analogous to BBGKY hierarchy for particles) which can simultaneously describe long strings \tilde{f}(A, B, x, t) as well as simple loops \mathring{f}(A, B, x, t) made out of four correlation vectors. The formalism can be used to study non-linear dynamics of fundamental strings, D-brane strings or field theory strings. For example, the complicated semi-scaling behavior of cosmic strings translates into a simple solution of the transport system at small energy densities.
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