18,715 research outputs found
Actions for QCD-like strings
We introduce a random lattice corresponding to ordinary Feynman diagrams,
with 1/p-squared propagators instead of the Gaussians used in the usual
strings. The continuum limit defines a new type of string action with two
worldsheet metrics, one Minkowskian and one Euclidean. The propagators
correspond to curved lightlike paths with respect to the Minkowskian worldsheet
metric. Spacetime dimensionality of four is implied not only as the usual
critical dimension of renormalizable quantum field theory, but also from
T-duality.Comment: 14 pg., plain tex, other formats available at
http://insti.physics.sunysb.edu/~siegel/preprints or at
ftp://max.physics.sunysb.edu/preprints/siege
Conquest of the ghost pyramid of the superstring
We give a new Becchi-Rouet-Stora-Tyutin operator for the superstring. It
implies a quadratic gauge-fixed action, and a new gauge-invariant action with
first-class constraints. The infinite pyramid of spinor ghosts appears in a
simple way through ghost gamma matrices.Comment: 30 pages, 1 figure, Late
Random lattice strings vs. type IIB matrix models
I comment on a curious relation between Siegel's model of random lattice
strings and type IIB matrix model. The comparison of the two theories suggests
that there may exist extra terms in the latter which are overlooked in the weak
string coupling limit.Comment: 3 pages, latex. Some mistakes have been correcte
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