• N G Sarkar

      Articles written in Pramana – Journal of Physics

    • WKB approximation in complex time II

      S Biswas J Guha N G Sarkar

      More Details Abstract Fulltext PDF

      The non-perturbative method, developed recently, of WKB approximation in complex time is applied to some known curved space time. Three cases namely (1) static in and out region, (2) non-static in and out region, (3) static in and non static out region are considered here. We find non-trivial particle production corresponding to the quantum vacuum definition of Castagnino and Mazzitelli.

    • Particle production in curved spacetime

      N G Sarkar S Biswas

      More Details Abstract Fulltext PDF

      Particle production in curved spacetime has been discussed through the method of complex time WKB approximation. We consider Dirac equation in non-flat spacetime to understand particle production as particle-antiparticle rotation. The method is also generalized to understand particle production through parametric resonance. To understand the method of CWKB we consider particle production in Kasner spacetime as an example.

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