Publications (16)
Reduced Half-sided Translations and Islands
Krishna Jalan, Roji Pius
An AdS black hole in equilibrium with a finite temperature non-gravitating bath comes with a Hawking-like information paradox. The resolution of this paradox requires introduci…
Hyperbolic Geometry of Superstring Perturbation Theory
Seyed Faroogh Moosavian, Roji Pius
We explore the hyperbolic structure of the RNS formulation of perturbative superstring theory. The aim is to provide a systematic method to explicitly compute on-shell and off-shel…
Gauge Theory Amplitudes from Cubic Scalar Feynman diagrams
Roji Pius
Feynman diagrams are the foremost tool in the perturbative study of quantum field theory. In gauge theories, the full potential of this tool is revealed when it is combined with th…
Quantum Closed Superstring Field Theory and Hyperbolic Geometry I: Construction of String Vertices
Roji Pius
The complete quantum theory of closed superstrings is constructed using string diagrams endowed with metric having constant curvature . The elementary string diagrams are equip…
Mass Renormalization in String Theory: General States
Roji Pius, Arnab Rudra, Ashoke Sen
In a previous paper we described a procedure for computing the renormalized masses and S-matrix elements in bosonic string theory for a special class of massive states which do not…
Island Paradigm and Information Recovery from Radiation
Krishna Jalan, Roji Pius, Manish Ramchander
The island paradigm for an AdS eternal black hole in the Hartle-Hawking state coupled to a finite temperature non-gravitating bath asserts that after the Page time the operator…
Cutkosky Rules for Superstring Field Theory
Roji Pius, Ashoke Sen
Superstring field theory expresses the perturbative S-matrix of superstring theory as a sum of Feynman diagrams each of which is manifestly free from ultraviolet divergences. The i…
S-duality Improved Perturbation Theory in Compactified Type I / Heterotic String Theory
Roji Pius, Ashoke Sen
We study the mass of the stable non-BPS state in type I / heterotic string theory compactified on a circle with the help of the interpolation formula between weak and strong coupli…
Hyperbolic Geometry and Closed Bosonic String Field Theory I: The String Vertices Via Hyperbolic Riemann Surfaces
Seyed Faroogh Moosavian, Roji Pius
The main geometric ingredient of the closed string field theory are the string vertices, the collections of string diagrams describing the elementary closed string interactions, sa…
Theory dependence of black hole interior reconstruction and the extended strong subadditivity
Sitender Pratap Kashyap, Roji Pius, Manish Ramchander
An AdS eternal black hole in equilibrium with a finite temperature bath presents a Hawking-like information paradox due to a continuous exchange of radiation with the bath. The non…
Unitarity of the Box Diagram
Roji Pius, Ashoke Sen
The complete proof of cutting rules needed for proving perturbative unitarity of quantum field theories usually employs the largest time equation or old fashioned perturbation theo…
Topological string entanglement
Veronika E. Hubeny, Roji Pius, Mukund Rangamani
We investigate how topological entanglement of Chern-Simons theory is captured in a string theoretic realization. Our explorations are motivated by a desire to understand how quant…
Hyperbolic Geometry and Closed Bosonic String Field Theory II: The Rules for Evaluating the Quantum BV Master Action
Seyed Faroogh Moosavian, Roji Pius
The quantum Batalian-Vilkovisky master action for closed string field theory consists of kinetic term and infinite number of interaction terms. The interaction strengths (coupling…
String Perturbation Theory Around Dynamically Shifted Vacuum
Roji Pius, Arnab Rudra, Ashoke Sen
In some string theories, e.g. SO(32) heterotic string theory on Calabi-Yau manifolds, a massless field with a tree level potential can acquire a tachyonic mass at the one loop leve…
Correlators in the Simplest Gauge-String Duality
Rajesh Gopakumar, Roji Pius
In this note we compare planar correlators such as in the Gaussian matrix model with corresponding genus zero correlators of the A-model topological str…
Mass Renormalization in String Theory: Special States
Roji Pius, Arnab Rudra, Ashoke Sen
String theory gives a well defined procedure for computing the S-matrix of BPS or a class of massless states, but similar calculation for general massive states is plagued with dif…