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String field theory is the quantum field theory that describes the dynamics of interacting strings. The principal advantages of string field theory are that it allows the computation of off-shell amplitudes and, gives non-perturbative information that cannot be seen directly from the standard genus expansion of string scattering. Unfortunately, the biggest problem of closed string field theory is that simple tools for performing calculations are not readily available. The main goal of my current research is to develop a calculable formulation of closed string field theory by exploring the collection of breakthrough works on the Weil-Petersson symplectic geometry of the moduli space of Riemann surfaces in recent years.

- Rahul Basu Memorial Award for Best Thesis, given for the two most outstanding Ph.D. theses from India, across all areas in High Energy Physics for the period 2014-2016, Indian Physics Association.

- Roji Pius, Ashoke Sen, Cutkosky Rules for Superstring Field Theory, JHEP 1610 (2016) 024, arXiv: 1604.01783
- Roji Pius, Arnab Rudra, Ashoke Sen, String Perturbation Theory Around Dynamically Shifted Vacuum, JHEP 1410 (2014) 70, arXiv: 1404.6254
- Roji Pius, Arnab Rudra, Ashoke Sen, Mass Renormalization in String Theory: General States, JHEP 1407 (2014) 062, arXiv: 1401.7014
- Roji Pius, Arnab Rudra, Ashoke Sen, Mass Renormalization in String Theory: Special States, JHEP 1407 (2014) 058, arXiv: 1311.1257
- Roji Pius, Ashoke Sen, S-duality improved perturbation theory in compactified type I/heterotic string theory, JHEP 1406 (2014) 068, arXiv: 1310.4593
- Rajesh Gopakumar, Roji Pius, Correlators in the Simplest Gauge-String Duality, JHEP 1303 (2013) 175, arXiv: 1212.1236
- Hyperbolic Geometry and Closed Bosonic String Field Theory II: The Rules for Evaluating the Quantum BV Master Action, Seyed Faroogh Moosavian, Roji Pius, arXiv: 1708.04977
- Hyperbolic Geometry and Closed Bosonic String Field Theory I: The String Vertices Via Hyperbolic Riemann Surfaces, Seyed Faroogh Moosavian, Roji Pius, arXiv: 1706.07366
- Hyperbolic Geometry of Superstring Perturbation Theory, Seyed Faroogh Moosavian, Roji Pius, arXiv: 1703.10563

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