5,960 research outputs found
Nonperturbative Solution of the Super-Virasoro Constraints
We present the solution of the discrete super-Virasoro constraints to all
orders of the genus expansion. Integrating over the fermionic variables we get
a representation of the partition function in terms of the one-matrix model. We
also obtain the nonperturbative solution of the super-Virasoro constraints in
the double scaling limit but do not find agreement between our flows and the
known supersymmetric extensions of KdV.Comment: 12 pages, CERN-TH.6761/9
Non-Abelian Duality and Canonical Transformations
We construct explicit canonical transformations producing non-abelian duals
in principal chiral models with arbitrary group G. Some comments concerning the
extension to more general -models, like WZW models, are given.Comment: 9 pags, latex fil
On the invariance of the string partition function under duality
We consider the supersymmetric -model and we examine the
transformation properties of the partition function under target-space duality.
Contrary to what one would expect, we find that it is not, in general,
invariant. In fact, besides the dilaton shift emerging from the Jacobian of the
duality transformation of the bosonic part, there also exist a Jacobian for the
fermionic part since fermions are also transform under the duality process. The
latter is just the parity of the spin structure of the word sheet and since it
cannot be compensated, the dual theory is not equvalent to the original one.Comment: 11 pages, Late
S-duality and Canonical Transformations in String Theory
The symmetries of the tree level string effective action are discussed. An
appropriate effective action is constructed starting from the manifestly
SL(2,R) invarint form of string effective action introduced by Schwarz and Sen.
The conserved charges are derived and generators of infinitesimal
transformations are obtained in the Hamiltonian formalism. Some interesting
consequences of the canonical transformations are explored.Comment: 13 pages, Latex, typos are corrected just after eqs. (11) & (17) also
some explanations are added ( version to appear in Phy. Let. B
Some Correlation Functions of Minimal Superconformal Models Coupled to Supergravity
We compute general three-point functions of minimal superconformal models
coupled to supergravity in the Neveu-Schwarz sector for spherical topology thus
extending to the superconformal case the results of Goulian and Li and of
Dotsenko.Comment: 15 page
Dual inflation
We propose a new model of inflation based on the soft-breaking of N=2
supersymmetric SU(2) Yang-Mills theory. The advantage of such a model is the
fact that we can write an exact expression for the effective scalar potential,
including non-perturbative effects, which preserves the analyticity and duality
properties of the Seiberg-Witten solution. We find that the scalar condensate
that plays the role of the inflaton can drive a long period of cosmological
expansion, produce the right amount of temperature anisotropies in the
microwave background, and end inflation when the monopole acquires a vacuum
expectation value. Duality properties relate the weak coupling Higgs region
where inflation takes place with the strong coupling monopole region, where
reheating occurs, creating particles corresponding to the light degrees of
freedom in the true vacuum.Comment: 5 pages, RevTeX, epsf, 2 figures (included in the text). Slightly
improved version, accepted in Physics Letters
Strongly interacting bosons and supersymmetry
We present arguments in favor of the idea that supersymmetric sigma models
with compact symmetric K\"ahler spaces as target manifolds have a second-order
phase transition in four dimensions. When applied to electroweak symmetry
breaking, these models then do not require a light Higgs boson or
techni-resonances but predict fermionic superpartners of longitudinal W's and Z
with masses at or below TeV scale. Presence of the phase transition leads to a
fractional-power energy dependence of fixed-angle scattering amplitude of
longitudinal W's and Z's at high energies.Comment: 8 pages, LATEX, UCLA/93/TEP/2
Differential geometry construction of anomalies and topological invariants in various dimensions
In the model of extended non-Abelian tensor gauge fields we have found new
metric-independent densities: the exact (2n+3)-forms and their secondary
characteristics, the (2n+2)-forms as well as the exact 6n-forms and the
corresponding secondary (6n-1)-forms. These forms are the analogs of the
Pontryagin densities: the exact 2n-forms and Chern-Simons secondary
characteristics, the (2n-1)-forms. The (2n+3)- and 6n-forms are gauge invariant
densities, while the (2n+2)- and (6n-1)-forms transform non-trivially under
gauge transformations, that we compare with the corresponding transformations
of the Chern-Simons secondary characteristics. This construction allows to
identify new potential gauge anomalies in various dimensions.Comment: 27 pages, references added, matches published versio
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