182 research outputs found
SL(2,Z) tensionless string backgrounds in IIB string theory
We examine a tensionless limit of a SL(2,Z) set of background solutions to
IIB supergravity theory, obtained by performing an infinite boost. This yields
a solution that corresponds to taking the original string tension to zero. The
limit reproduces ordinary Minkowski space except for a delta-like singularity
along the string. We study the field content and the energy momentum tensor.Comment: 1+8 pages, LaTeX, JHEP styl
Transition density of diffusion on Sierpinski gasket and extension of Flory's formula
Some problems related to the transition density u(t,x) of the diffusion on
the Sierpinski gasket are considerd, based on recent rigorous results and
detailed numerical calculations. The main contents are an extension of Flory's
formula for the end-to-end distance exponent of self-avoiding walks on the
fractal spaces, and an evidence of the oscillatory behavior of u(t,x) on the
Sierpinski gasket.Comment: 11 pages, REVTEX, 2 postscript figure
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