535 research outputs found
First Massive State of the Superstring in Superspace
Using the manifestly spacetime supersymmetric description of the
four-dimensional open superstring, we construct the vertex operator in
superspace for the first massive state. This construction provides an N=1 D=4
superspace representation of the massive spin-2 multiplet.Comment: 7 pages late
Integral equations of scattering in one dimension
A self-contained discussion of integral equations of scattering is presented
in the case of centrally-symmetric potentials in one dimension, which will
facilitate the understanding of more complex scattering integral equations in
two and three dimensions. The present discussion illustrates in a simple
fashion the concept of partial-wave decomposition, Green's function,
Lippmann-Schwinger integral equations of scattering for wave function and
transition operator, optical theorem and unitarity relation. We illustrate the
present approach with a Dirac delta potential.Comment: 12 pages, accepted in American Journal of Physic
Reply to "Comment on Renormalization group picture of the Lifshitz critical behaviors"
We reply to a recent comment by Diehl and Shpot (cond-mat/0305131)
criticizing a new approach to the Lifshitz critical behavior just presented (M.
M. Leite Phys. Rev. B 67, 104415(2003)). We show that this approach is free of
inconsistencies in the ultraviolet regime. We recall that the orthogonal
approximation employed to solve arbitrary loop diagrams worked out at the
criticized paper even at three-loop level is consistent with homogeneity for
arbitrary loop momenta. We show that the criticism is incorrect.Comment: RevTex, 6 page
Black Holes in the Gauge Theoretic Formulation of Dilatonic Gravity
We show that two-dimensional topological BF theories coupled to particles
carrying non-Abelian charge admit a new coupling involving the Lagrange
multiplier field. When applied to the gauge theoretic formulation of dilatonic
gravity it gives rise to a source term for the gravitational field. We show
that the system admits black hole solutions.Comment: Action is improved to be reparametrization invariant. Misprintings
corrected. 10 pages, Late
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