18 research outputs found
Twisting Classical Solutions in Heterotic String Theory
We show that, given a classical solution of the heterotic string theory which
is independent of of the space time directions, and for which the gauge
field configuration lies in a subgroup that commutes with of the
generators of the gauge group, there is an transformation,
which, acting on the solution, generates new classical solutions of the theory.
With the help of these transformations we construct black 6-brane solutions in
ten dimensional heterotic string theory carrying independent magnetic, electric
and antisymmetric tensor gauge field charge, by starting from a black 6-brane
solution that carries magnetic charge but no electric or antisymmetric tensor
gauge field charge. The electric and the magnetic charges point in different
directions in the gauge group.Comment: 20 page
Marginal Deformations of WZNW and Coset Models from O(d,d) Transformation
We show that O(2,2) transformation of SU(2) WZNW model gives rise to marginal
deformation of this model by the operator where
, are U(1) currents in the Cartan subalgebra. Generalization of
this result to other WZNW theories is discussed. We also consider O(3,3)
transformation of the product of an SU(2) WZNW model and a gauged SU(2) WZNW
model. The three parameter set of models obtained after the transformation is
shown to be the result of first deforming the product of two SU(2) WZNW
theories by marginal operators of the form , and then gauging an appropriate U(1) subgroup of the theory. Our analysis
leads to a general conjecture that O(d,d) transformation of any WZNW model
corresponds to marginal deformation of the WZNW theory by combination of
appropriate left and right moving currents belonging to the Cartan subalgebra;
and O(d,d) transformation of a gauged WZNW model can be identified to the
gauged version of such marginally deformed WZNW models.Comment: 26 pages, phyzzx.tex, TIFR-TH-92-6
Kappa-symmetric deformations of M5-brane dynamics
We calculate the first supersymmetric and kappa-symmetric derivative
deformation of the M5-brane worldvolume theory in a flat eleven-dimensional
background. By applying cohomological techniques we obtain a deformation of the
standard constraint of the superembedding formalism. The first possible
deformation of the constraint and hence the equations of motion arises at cubic
order in fields and fourth order in a fundamental length scale . The
deformation is unique up to this order. In particular this rules out any
induced Einstein-Hilbert terms on the worldvolume. We explicitly calculate
corrections to the equations of motion for the tensor gauge supermultiplet.Comment: 17 pages. Additional comments in section
Kappa-symmetric Derivative Corrections to D-brane Dynamics
We show how the superembedding formalism can be applied to construct
manifestly kappa-symmetric higher derivative corrections for the D9-brane. We
also show that all correction terms appear at even powers of the fundamental
length scale . We explicitly construct the first potential correction, which
corresponds to the kappa-symmetric version of the , which one
finds from the four-point amplitude of the open superstring.Comment: 20 pages. Minor changes, added reference