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20 papers · 2 filters
A Time-Dependent Classical Solution of C=1 String Field Theory and Non-Perturbative Effects
Avinash Dhar, Gautam Mandal, Spenta R. Wadia
We describe a real-time classical solution of string field theory written in terms of the phase space density, , of the equivalent fermion theory. The solution corr…
Matrix Models and Black Holes
Sumit R. Das
We show that an integral transform of the fluctuations of the collective field of the matrix model satisfy the same linearized equation as that of the massless "tachyon" in t…
Marginal Deformations of WZNW and Coset Models from O(d,d) Transformation
S. F. Hassan, Ashoke Sen
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)…
Stringy Quantum Effects in 2-Dimensional Black-Hole
Avinash Dhar, Gautam Mandal, Spenta R. Wadia
We discuss the classical 2-dim. black-hole in the framework of the non-perturbative formulation (in terms of non-relativistic fermions) of c=1 string field theory. We identify an o…
Renormalization of Couplings in Embedded Random Surfaces
Sumit R. Das, S. Kalyana Rama
We study the dressing of operators and flows of corresponding couplings in models of {\it embedded} random surfaces. We show that these dressings can be obtained by applying the me…
Quantization of Dyon Charge and Electric-Magnetic Duality in String Theory
Ashoke Sen
We analyze the allowed spectrum of electric and magnetic charges carried by dyons in (toroidally compactified) heterotic string theory in four dimensions at arbitrary values of the…
Naked Singularities as Possible Candidates for Gamma-ray Bursters
Sandip K. Chakrabarti, Pankaj S. Joshi
Naked singularities appear naturally in dynamically evolving solutions of Einstein equations involving gravitational collapse of radiation, dust and perfect fluids, provided the ra…
Non-relativistic Fermions, Coadjoint Orbits of \winf\ and String Field Theory at
Avinash Dhar, Gautam Mandal, Spenta R. Wadia
We apply the method of coadjoint orbits of \winf-algebra to the problem of non-relativistic fermions in one dimension. This leads to a geometric formulation of the quantum theory i…
Electric Magnetic Duality in String Theory
Ashoke Sen
The electric-magnetic duality transformation in four dimensional heterotic string theory discussed by Shapere, Trivedi and Wilczek is shown to be an exact symmetry of the equations…
Target Space Interpretation of New Moduli in 2D String Theory
Swapna Mahapatra, Sudipta Mukherji, Anirvan M. Sengupta
We analyze the new states that have recently been discovered in 2D string theory by E. Witten and B. Zwiebach. Since the Liouville direction is uncompactified, we show that the def…
Kleinian Singularities and the Ground Ring of C=1 String Theory
Debashis Ghoshal, Dileep P. Jatkar, Sunil Mukhi
We investigate the nature of the ground ring of c=1 string theory at the special A-D-E points in the c=1 moduli space associated to discrete subgroups of SU(2). The chiral ground r…
Macroscopic Charged Heterotic String
Ashoke Sen
Classical solutions of equations of motion in low energy effective field theory, describing fundamental charged heterotic string, are found. These solutions automatically carry an…
Four Dimensional 2-Brane Solution in Chiral Gauged Wess-Zumino-Witten Model
Swapna Mahapatra
An exact conformal field theory describing a four dimensional 2-brane solution is found by considering a chiral gauged Wess-Zumino -Witten theory corresponding to $SL(2, R)\times R…
Classical Fermi Fluid and Geometric Action for
Avinash Dhar, Gautam Mandal, Spenta R. Wadia
We formulate the matrix model as a quantum fluid and discuss its classical limit in detail, emphasizing the corrections. We view the fermi fluid profiles as elements…
Rotating Charged Black Hole Solution in Heterotic String Theory
Ashoke Sen
We construct a solution of the classical equations of motion arising in the low energy effective field theory for heterotic string theory. This solution describes a black hole in f…
The Spectrum of Sl(2, R)/U(1) Black Hole Conformal Field Theory
Dileep P. Jatkar
We study string theory in the background of a two-dimensional black hole which is described by an coset conformal field theory. We determine the spectrum of this co…
On The Interpolating Solutions of Strings in Different Backgrounds
Sudipta Mukherji
We analyze the beta-function equations for string theory in the case when the target space has one spacelike (or timelike) direction and rest is some conformal field theory (CFT) w…
Picture Changing Operators in Closed Fermionic String Field Theory
R. Saroja, A. Sen
We discuss appropriate arrangement of picture changing operators required to construct gauge invariant interaction vertices involving Neveu-Schwarz states in heterotic and closed s…
Gauge Transformations in String Field Theory and canonical Transformation in String Theory
J. Maharana, S. mukherji
We study how canonical transfomations in first quantized string theory can be understood as gauge transformations in string field theory. We establish this fact by working out some…
On the Background Independence of String Field Theory: III. Explicit Field Redefinitions
Ashoke Sen
Given two conformal field theories related to each other by a marginal perturbation, and string field theories constructed around such backgrounds, we show how to construct explici…