Debashis Gangopadhyay is a home-bred theoretical physicist who puts into practice the academic ideals and morals he imbibed from Kolkata-based international class excellence as embodied in the ersonalities of Prof. Amal Kumar Raychaudhuri, Prof. Chanchal Kumar Majumdar, Prof. Manoj Kumar Pal and Prof. Ashok Chatterjee (his thesis advisor). Teaching and research are two principal ingredients of his academic livelihood and he constantly upgrades himself in these areas. His research area covers a wide landscape in quantum field theory that includes lattice gauge theories, stochastic quantisation, string theory, quantum groups, Fermi liquids and field theory based cosmology. Currently he is deeply into quantum computation and information theory and Artificial Intelligence based quantum theories Area of Research: Quantum Field Theory, Cosmology, Quantum Computation and Information
Employment / Education / Miscellaneous :
• Faculty (1st March 2020 onwards) : Dept.Of Physics, Sister Nivedita University, Kolkata
• Faculty ( 1st Jan 2012- 30th April 2020): Ramakrishna Mission Vivekananda Educational and Research Institute, Belur Matth, Howrah
• Faculty (18th July 1991- 31st Dec. 2011): S. N. Bose National Centre for Basic Sciences, Kolkata, India
• Postdoctoral Fellow (1989-1991): Bogolubov Laboratory of Theoretical Physics, Joint Institute of Nuclear Research, Dubna, Moscow, Russia
• Postdoctoral Fellow (1987-1989): Institute of Physics, Bhubaneswar, India
• Lecturer in Physics (1986-1987): Head, Department of Physics, College of Textile Technology, Berhampore, Murshidabad, India
• Ph. D. (1988): Saha Institute of Nuclear Physics, Kolkata, India
Thesis title : Some studies in recent developments in quantum field theory
• M.Sc. (Physics, First Class)(1977): University of Calcutta, Kolkata, India
• B.Sc. (Physics Hons., First Class)(1975): Presidency College, University of Calcutta, Kolkata, India
• Indian School Certificate (First Division) (1972), Calcutta Boys' School, University of Cambridge Local Examinations Syndicate
• National Scholarship (1972)
• National Science Talent Search Scholarship (1972 – 1977)
• Nominated life member : Baba Alauddin Khan Memorial Committee (founded by Srimati
Annapurna Devi , Ustad Ali Akbar Khan & Pandit Ravi Shankar )
TEACHING :
S. N.Bose National Centre for Basic Sciences/ RKMVERI / SNU / Calcutta University) (Visiting) /
Tripura University (Visiting) / University of Auckland (Visiting)
Physics Core and Advanced Courses at Master’s level:
Classical Mechanics , Statistical mechanics, Electrodynamics, Quantum Mechanics,
Nuclear and Particle Physics, Quantum field theory, General theory of Relativity,
Quantum Computation and Information Theory
Generic Elective courses at Master’s level for students whose Major is NOT Physics:
The Mysterious Universe ( A 4 credit course summarising Particle Physics and Cosmology )
Science in History (A 4 credit course summarising the contributions to science by communities in the
geographical locations of India, China, Japan, Middle East, South East Asia and South America)
Quantitative Finance ( A 4 credit course on techniques of Physics and Mathematics used in modern finance)
Quantum Computation and Information Theory ( A 4-credit introductory course for non-Physics Majors)
Selected Publications
• Teleportation with non-maximally entangled states and underlying unitary algebras of certain
bipartite systems , P. Dasgupta and D. Gangopadhyay, arXiv:2505.21084 [quant-ph] (2025)
• From geometry to observation: gravitational waves and the Raychaudhuri equation, Sougata Bhunia,
Anubhab Dutta, Debashis Gangopadhyay, Goutam Manna, Physics of the Dark Universe V50,
102089 , (2025) (The fundamental theoretical basis of this paper is Anubhab Dutta’s SNU MSc 4th
semester project work. The external collaborators supplied the observational data that supported the
predictions from the theoretical project work).
• Non -affine extensions of the Raychaudhuri equation in the K-essence framework, Samit Ganguly,
Goutam Manna, Debashis Gangopadhyay, Eduardo Guendelman, Abhijit Bhattacharyya,
Physics Letters B868 , 139622, (2025)
• NEC violation in f(R,T) gravity in the context of a non-canonical theory via modified Raychaudhuri
equation, Arijit Panda, Debashis Gangopadhyay, Goutam Manna , Astroparticle Physics 165 ,
103059 (2025) (available online https://doi.org/10.1016/j.astropartphys.2024.103059)
• Form Invariance of Raychaudhuri equation in the presence of Inflaton-type fields,
Arijit Panda, Debashis Gangopadhyay, Goutam Manna , Fortschr. Phys. 2024 , 2400134 (2024)
• An Accelerated Universe with Negative Equation of state parameter in Inhomogeneous Cosmology
with k-essence Scalar field, Somnath Mukherjee and Debashis Gangopadhyay,
Physics of the Dark Universe 32, 100800, (2021)
• F(R) Gravity with k-essence Scaling Relation and Cosmic Acceleration, Somnath Mukherjee and
Debashis Gangopadhyay, ISSN 2688-8300 (Print) ISSN 2644-3368 (Online),
JMSCM, 1, No.4, (2020)
• Three Flavoured neutrino oscillations and the Leggett Garg Inequality, Debashis Gangopadhyay and
Animesh Sinha Roy, Euro.Phys. Jour. C 77, 260 (2017)
• Semiclassical treatment of k-essence effect on cosmic temperature, Abhijit Bandyopadhyay, Debashis
Gangopadhyay and Arka Moulik, Gravitation and Cosmology 23, 184 (2017)
• 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)
• Probing the Leggett-Garg Inequality for Oscillating Neutral Kaons and Neutrinos, D.
Gangopadhyay, D.Home, A.Sinha Roy , Phys.Rev. A88 022115 (2013)
• The Hawking temperature in the context of dark energy
Debashis Gangopadhyay and Goutam Manna, Euro.Phys.Lett. 100 49001 (2012)
• The k-essence scalar field in the context of Supernova Ia Observations, Abhijit Bandyopadhyay,
Debashis Gangopadhyay , Arka Moulik, Eur. Phys. Jour. C 72, 1943, (2012)
• 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)
• Evolution of primordial black holes in Jordan-Brans-Dicke Cosmology- A.S. Majumdar, Debashis
Gangopadhyay, L.P.Singh, Monthly Notices of the Royal Astronomical Society 385 1467 (2008)
• Spacetime Dependent Lagrangians and Electrogravity Duality- Debashis Gangopadhyay,
R.Bhattacharjee, L.P.Singh, Gravitation and Cosmology, 13 , 285 (2007)
• Quantum Logic Gates with q-Deformed Oscillators- Debashis Gangopadhyay & M.N. Sinha Roy,
Int. Jour. Quant. Inform. 4 297 (2006)
• Growth Models and Models of Turbulence: A Stochastic Quantisation Perspective- H.S.Samanta,
J.K.Bhattacharjee, Debashis Gangopadhyay, Phys. Lett. A353 113 (2006)
• Vacuum expectation value of the Higgs Field and Dyon Charge Quantisation from Spacetime
Dependent Lagrangians- R.Bhattacharyya and D.Gangopadhyay, Mod.Phys Lett . A18 1 (2003)
• Spacetime Dependent Lagrangians and Weak-Strong Duality : Sine-Gordon and Massive Thirring
Models- R.Bhattacharyya and D.Gangopadhyay, Mod.Phys.Lett. A17 729 (2002)
• Duality in Equations of Motion from Spacetime Dependent Lagrangians- R. Bhattacharyya and D.
Gangopadhyay, Modern Physics Letters A15 901 (2000)
• Duality invariance of cosmological solutions with torsion, Debashis Gangopadhyay and S. Sengupta,
Int. Jour. Mod. Phys. A 14, 4953 (1999)
• Van der Waerden’ s Colouring Theorem and Classical Spin Systems - R.Chaudhury, D.
Gangopadhyay and S. K. Paul, Mod. Phys. Lett. B11 923 (1997)
• Interacting Fermions , Scaling and Possible Departure From Fermi Liquid Behaviour- R.
Chaudhury and D. Gangopadhyay, Mod. Phys. Lett.. B9 1657 (1995)
• Quantum Discrete Gauge Models with Bosonic and Fermionic Degrees of Freedom - A.T.
Filippov , D. Gangopadhyay and A. P. Isaev, Int. Jour. Mod. Phys. A7 2487 (1992)
• Discrete “Strings” and Gauge Model of Three Confined Relativistic Particles - A.T. Filippov ,
D. Gangopadhyay and A.P. Isaev , Int. Jour. Mod. Phys. A7 3639 (1992)
• On canonical q-transformations with two q-oscillators, Debashis Gangopadhyay, Mod. Phys. Lett.
A 31, 2909 (1991)
• Harmonic Oscillator Realisation of the Canonical q-Transformation - A.T. Filippov, D.
Gangopadhyay and A.P.Isaev, Jour. Phys. A24 L63 (1991)
• On the Harmonic Oscillator Realisation of q-Oscillators- D. Gangopadhyay and A.P. Isaev, JINR
Rapid Comm.45 35 (1990)
• 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)
• Functional Stochastic Quantisation Of Gauge Theories- A.Chatterjee and D. Gangopadhyay,
Jour.Phys.G13 L97 (1987)
• Functional Stochastic Quantisation and Perturbation Theory- Debashis Gangopadhyay, A.
Chatterjee and P. Mazumdar Jour.Phys. G12 L1 (1986)
• Factorisation in Large-N Limit of Lattice Gauge Theories Revisited- A. Chatterjee and D.
Gangopadhyay, Pramana 21 385 (1983)
Other Selected Publications:
(1) NA HOY NISHUPTI : a book of Bengali poetry, Subarnarekha Publishers (2009).
(2) All is not well with higher education in India : The Telegraph, Calcutta 10th July 2012 (op-ed) .
https://www.telegraphindia.com/opinion/all-is-not-well-with-higher-education-in-india/cid/404965
(3) The menace of destructive education policies : The Telegraph, Calcutta 12th July 2012 (op-ed) .
https://www.telegraphindia.com/opinion/the-menace-of-destructive-education-policies/cid/404923
(4) Growing Strong : The Telegraph, Calcutta 16th October 2014 (Fifth Column) .
(5) In the Shadows : The Telegraph, Calcutta 1st April 2019 (Fifth Column) .
https://www.telegraphindia.com/opinion/bibha-chowdhuri-donna-strickland-jocelyn-bell-burnell-the-
invisible-women-in-science/cid/1687897
(6) Powers To Reckon With :The Telegraph, Calcutta 20th June 2019, (Book Review).
https://www.telegraphindia.com/culture/books/women-scientists-who-changed-the-world/cid/1691150
PhD students:
(1) Rajsekhar Bhattacharyya (Ph. D. Jadavpur University), Thesis title: “Studies on recent development in
non-perturbative aspects of gauge theories” ( Quantum field Theory)
(2) Goutam Manna (Ph. D. Calcutta University), Thesis title: “Some studies in emergent gravity and k-
essence ” (Cosmology and Quantum field Theory)
(3) Somnath Mukherjee (Ph. D. Jadavpur University), Thesis title: “Some studies on cosmic origins of dark
matter and dark energy” (Cosmology)
(4) Oindrila Ganguly (Ph. D. Calcutta University), Thesis title: “Lorentz invariance violation: a study in the
context of effective theories” (Quantum Field Theory)
(5) Animesh Singha Roy (Ph. D. RKMVERI), Thesis title: “Neutral Kaon Oscillations, Neutrino
Oscillations and the Page-Wootters Mechanism in the light of the Leggett-Garg Inequality” (Quantum
Correlations, Quantum Information)
Current PhD student : Prabal Dasgupta (SNU) (Quantum Computation and Information Theory)
Recent Visiting Summer Internships (Indian Academy of Sciences, Bangalore):
Mr. Praneet Pathak , IIESER, Mohali, May-July 2019;
Mr. Mritunjay Tyagi, Delhi University, June- August 2019 ;
Ms. Ashwini Nagaraj Shenoy (II BE) N.M.A.M. Institute of Technology, Udupi, May-July 2020 ;
Mr. Gaurang Ramakant Kane (II BTech) Indian Institute of Technology, Guwahati, June-August 2020;
Swara Mishra , St. Stepen’s, New Delhi, 2023;
Sagarneel Ghosh , IIT KGP, 2024
Plus 20 other direct summer interns from other universities over the years 2012-2024
Most of the students doing summer projects succeeded in getting PhD scholarships abroad (some in the US
and a majority in Europe) based on their project work only.
Member of Academic / Other Bodies
(1) Member: Government of West Bengal State Council of Science and Technology till 2022
(2) Member: Government of West Bengal Higher Education Advisory Committee till 2016
(3) Member: Governing Council, Institute of Development Studies, Kolkata till 2018
(4) Member: Board of Management, Ramakrishna Mission Vivekananda University till 2018
(5) Member: WB Govt. Pollution Control Board Research and Development Committee ( 2012-present)
(Coordinated experiments on sound pollution to show that noise above 95 decibels for firecrackers is
a health hazard. The National Green Tribunal of the Supreme Court of India upheld the report and
West Bengal was the only state in India where sound of firecrackers could not exceed
95 decibels till 2023.)
Conferences / Seminars: Invited speaker : 16 international and 11 national
Peer Reviewer of International Journals / National Science Boards :
(a) Physics Letters A, B
(b) Euro Physics Letters
(c) Euro Physics Journal C
(d) Journal Of Physics
(e) Modern Physics Letters A, B, D
(f) Science and Engineering Research Board (SERB) Project Reviewer
(g) Dept. of Science and technology (DST) Project Reviewer
Administrative Experience
S.N.Bose National Centre For Basic Sciences
(1) Faculty-in-charge of library: 1995-2002
(2) Chairman of Stock-taking Committee: 1995-2000
(3) Chairman of Office Space Allocation Committee: 1995-2000
(4) Coordinator of Visitor’s Programme : 2006-2008
(5) Faculty-in-charge of library : Nov.2010- Feb.2011
Ramkrishna Mission Vivekananda University (RKMVU/RKMVERI)
• Head, Department of Physics, RKMVU, 2012-2018.
• Set up the first Positional Astronomy Centre in a private university in West Bengal by procuring Rs.
45 project money : computerised Celestron 14" Edge HD Pro telescope, three Celestron 11" Edge
HD CGX telescope, Celestron Travel Scope 50 portable telescope and Celestron Skyprodigy 6 -
Computerized 6" SCT telescope.
• In collaboration with ISRO , was Convenor of Rural Asset Mapping of 45 Gram panchayats in West
Bengal by coordinating the activities of about 100 students of RKMVU through physical visits by the
students to the relevant geographical areas and then uploading of data to the ISRO satellite by the
BHUVAN app using remote sensing technology.