As long as I live so long will I learn - Sri Ramakrishna

Debashis Gangopadhyay

Name: Debashis Gangopadhyay

Area of Research: Quantum Field Theory, Cosmology, Quantum Computation and Information

Contact address:


Link to personal webpage:

Education and Employment:

Faculty (2012-Present): RKMVERI

Faculty (1991-2011): S. N. Bose National Centre for Basic Sciences, Kolkata, India

Postdoctoral Scholar (1989-1991): Bogolubov Laboratory of Theoretical Physics, Joint Institute of Nuclear Research, Dubna, Moscow, Russia.

Postdoctoral Scholar (1987-1989): Institute of Physics, Bhubaneswar, India.

Lecturer in Physics (1986-1987): Under West Bengal Education Service, posted as Head, Department of Physics, College of Textile Technology, Berhampore, Murshidabad , West Bengal

Ph. D. (1988): Saha Institute of Nuclear Physics, Kolkata, India

M.Sc. (Physics,First Class)(1977): University of Calcutta, Kolkata, India

B.Sc. (Physics Hons.,First Class)(1975): Presidency College, Kolkata, India

Selected Publications

  • The Leggett-Garg Inequality and Page-Wootters Mechanism, Debashis Gangopadhyay and Animesh Sinha Roy, Euro. Phys. Lett. 116, 40007 (2016)

  • The Hawking temperature in the context of dark energy for Reissner-Nordstrom and Kerr background, G. Manna and Debashis Gangopadhyay, Euro. Phys. Jour. C 74, 2811 (2014)

  • Estimating temperature fluctuations in the early Universe, Debashis Gangopadhyay, Gravitation and Cosmology 16, 231 (2010)

  • Logarithm of the scale factor as a generalised coordinate in a lagrangian for dark matter and dark energy, Debashis Gangopadhyay and Somnath Mukherjee, Physics Letters B 665, 121 (2008)

  • The CNOT quantum logic gate using q-deformed oscillators, Debashis Gangopadhyay, Int. Jour. Quant. Inform. 6, 471 (2008)

  • Spacetime dependent Lagrangians and weak-strong duality: Sine-Gordon and massive Thirring models, R. Bhattacharyya and Debashis Gangopadhyay, Mod. Phys. Lett. A 17, 729 (2002)

  • Duality invariance of cosmological solutions with torsion, Debashis Gangopadhyay and S. Sengupta, Int. Jour. Mod. Phys. A 14, 4953 (1999)

  • On canonical q-transformations with two q-oscillators, Debashis Gangopadhyay, Mod. Phys. Lett. A 31, 2909 (1991)

  • Gauge fixing for linearized gravity and antisymmetric tensor fields, Debashis Gangopadhyay, Int. Jour. Mod. Phys. A 5, 2145 (1990)

  • Fujikawa-type formulation of gauged BRST symmetry for the free Bosonic string, Debashis Gangopadhyay and L. P. Singh, Phys. Rev. D (Rapid Comm.) 38, 2652 (1988)

Research Interests

I have worked in the formalism and applications of quantum field theory. In cosmology I am mostly interested in using field theoretic techniques to understand the early universe and the dark matter and and dark energy scenario. In quantum computation and information theory, my interest lies in quantum logic gates and quantum correlations.

Past PhD students:

(1) Rajsekhar Bhattacharyya (Ph. D. 2004, Jadavpur University), Thesis title: “Studies on recent development in non-perturbative aspects of gauge theories

(2) Goutam Manna (Ph. D. 2016, Calcutta University), Thesis title: “Some studies in emergent gravity and k-essence

(3) Somnath Mukherjee (Ph. D. 2017,  Jadavpur University), Thesis title: “Some studies on cosmic origins of dark matter and dark energy

(4) Oindrila Ganguly (Ph. D. 2018, Calcutta University), Thesis title: “Lorentz invariance violation: a study in the context of effective theories

(5) Animesh Singha Roy (Thesis submitted in November 2017, RKMVERI), Thesis title: “Neutral Kaon Oscillations, Neutrino Oscillations and the Page-Wootters Mechanism in the light of the Leggett-Garg Inequality

Current PhD students:

Indrajit Mondal