573 research outputs found
Superconformal Field Theory with Boundary: Fermionic Model
Fermionic model of Superconformal field theory with boundary is considered.
There were written the ''boundary'' Ward Identity for this theory and also
constructed boundary states for fermionic and spin models. For this model were
derived ''bootstrap'' equations for boundary structure constants.Comment: 12 page
On Non-Critical Superstring/Black Hole Transition
An interesting case of string/black hole transition occurs in two-dimensional
non-critical string theory dressed with a compact CFT. In these models the high
energy densities of states of perturbative strings and black holes have the
same leading behavior when the Hawking temperature of the black hole is equal
to the Hagedorn temperature of perturbative strings. We compare the first
subleading terms in the black hole and closed string entropies in this setting
and argue that the entropy interpolates between these expressions as the energy
is varied. We compute the subleading correction to the black hole entropy for a
specific simple model.Comment: 10 pages; harvma
The Ground Ring of N=2 Minimal String Theory
We study the \NN=2 string theory or the \NN=4 topological string on the
deformed CHS background. That is, we consider the \NN=2 minimal model coupled
to the \NN=2 Liouville theory. This model describes holographically the
topological sector of Little String Theory. We use degenerate vectors of the
respective \NN=2 Verma modules to find the set of BRST cohomologies at ghost
number zero--the ground ring, and exhibit its structure. Physical operators at
ghost number one constitute a module of the ground ring, so the latter can be
used to constrain the S-matrix of the theory. We also comment on the
inequivalence of BRST cohomologies of the \NN=2 string theory in different
pictures.Comment: 25 pages, latex, small correction
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