S U M A N TA C H A K R A B O RT Y

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1 S U M A N TA C H A K R A B O RT Y personal information Born in India, 19 March 1991 sumantac.physics@gmail.com; sumanta@iucaa.in Address (Home) 5, Shyamapally, Flat No. 1A 29/A/1N Raja S.C. Mullick Road Sulekha, Jadavpur, Kolkata , India (Office) Room No. 427 Theoretical Physics Department Indian Association for the Cultivation of Science (IACS) 2A and 2B Raja S.C. Mullick Road, Jadavpur Kolkata , India. Website Phone (O) +91 (33) (Ext. 2155) short bio Sumanta Chakraborty is currently a National Post-Doctoral Fellow at the Indian Association for the Cultivation of Science (IACS), Kolkata, India. He has received the Ph.D degree from Jawaharlal Nehru University on 23rd February,. The title of his PhD thesis is Classical and Quantum Aspects of Gravity in Relation to The Emergent Paradigm. Throughout school, college and university he has won numerous prizes and scholarships. He has received most prestigious fellowships in India throughout his career (the Shyama Prasad Mukherjee (SPM) Fellowship, the Satyendra Nath Bose Memorial Prize, the KVPY fellowship and the INSPIRE fellowship). He has also received the INFN Fellowship from Italian National Institute of Nuclear Physics and the National Post Doctoral Fellowship from SERB, Government of India for his post-doctoral research. His Doctoral research has won him V.V. Narlikar Best Thesis Award from IAGRG, India. Further, his essay has received honorable mention in 2016 gravity essay competition. During his research career, he has published thirty five research papers in refereed international journals. Besides, he has published a chapter in the book Gravity and the Quantum by Springer. He has also organized one national conference. research experience Post-Doctoral Position-II Present National Post-Doctoral Fellow at IACS, India Joined on 6th April, as a National Post-Doctoral fellow. Currently working on various aspects of gravitational theories Black hole physics; Cosmological imprint of quantum gravity effects, in particular that of zero point length; Quantum fields in curved spacetime, e.g., information paradox, entanglement entropy; Higher dimensional effects in higher curvature gravity theories and their applications in astrophysics; Properties and characterization of null surfaces; The gravity thermodynamics connection; Alternative gravity theories, black hole solutions and possible observational consequences;

2 Gravitational waves in extra-dimensional models; Higher spin theories and Particle phenomenology. Post-Doctoral Position-I PhD in Physics 2016 Research Associate at IACS, Kolkata, India Joined on 25th October, 2016 as a post-doctoral fellow and worked till 5th April,. Worked on various aspects of gravity Quantum fields in curved spacetime, e.g., information paradox, firewall; Higher dimensional effects in higher curvature gravity theories; Null surfaces; Alternative gravity theories SPM Research Fellow at IUCAA, Pune, India Worked on both classical and quantum aspects of gravity. In particular Black Hole and Spacetime Thermodynamics, Alternative Gravity Theories, Extra Dimensional Models, Quantum Fields in Curved Spacetime and Black Hole Information Paradox. The title of my submitted PhD thesis is Classical and Quantum Apects of Gravity in Relation to the Emergent Paradigm. Total duration of my doctoral research was from 29th July, 2013 to 24th October, Secured first rank in the IUCAA-NCRA graduate school and has obtained Grade A+. Did a graduate school project under supervision of Prof. Thanu Padmanabhan entitled Thermodynamical Variables in Lanczos-Lovelock Gravity. Advisor: Prof. Thanu Padmanabhan paddy@iucaa.in education KVPY Fellow at Calcutta University, India Masters in Physics Bachelors in Physics Schooling Graded Outstanding in all four semesters. Received Satyendra Nath Bose Memorial Prize for securing first rank in the university. M.Sc. Project: Astrophysical Aspects of Alternative Gravity Theories. Advisor: Prof. Soumitra SenGupta tpssg@iacs.res.in INSPIRE Fellow at Presidency College, India First rank in the university. Gold Medalist for securing first rank among all students in the college. B.Sc. Project: Liquid Crystals and Phase Transitions. Advisor: Prof. Prabir K. Mukherjee pkmuk1966@gmail.com Student at Jodhpur Park Boys School, India Among the top ten throughout the school. Scholarship for both 10th and 12th standard by West Bengal Board of Education. awards, honors (in reverse chronological order) 1. V.V. Narlikar Best Thesis Award Received V.V. Narlikar best thesis award from Indian Association for General Relativity and Gravitation, India. This award is given to the candidate with best PhD thesis throughout India during past two years. 2. National Post Doctoral Fellowship Received National Post Doctoral Fellowship from Science and Engineering 2

3 Research Board, Government of India. This fellowship is given to best PhD students throughout India for pursuing post doctoral research. 3. INFN Fellowship Received INFN fellowship from Italian National Institute of Nuclear Physics. This is given to the best PhD students, internationally, to pursue their post doctoral research in institutes/universities in Italy Honorable Mention 2016 Gravity research foundation annually organizes an international essay competition. Submitted essay Quantum leaps of black holes: Magnifying glasses of quantum gravity received honorable mention in the competition Shyama Prasad Mukherjee Fellowship This Special Fellowship is given to top four rank holders each year in the National Eligibility Test (NET), conducted by Council of Scientific and Industrial Research (CSIR), India, for pursuing Ph.D programmes, and carries the highest amount of research scholarship and research grant National Eligibility Test, First Rank 2013 The National Eligibility Test (NET) is conducted by the Council of Scientific and Industrial Research (CSIR), India, for pursuing Ph.D programmes. Secured First rank at the national level in this examination in Physical Sciences Joint Entrance Screening Test, Third Rank 2013 The Joint Entrance Screening Test (JEST) is a joint qualifying test for admissions to the Ph.D programmes in several leading research institutes in India. Secured Third rank at the national level Prof. Satyendra Nath Bose Memorial Prize 2013 For securing first rank in M.Sc. Physics examination 2013 in University of Calcutta Sujan Kumar Seal Memorial Scholarship 2013 For completion of two year M.Sc. Physics with highest marks in University of Calcutta Shyama Prasad Mookerjee Gold Medal 2011 For highest scholastic record among all the Honors graduates of Presidency college National Top One Percent 2010 Placed in national top one percent in the National Graduate Physics Examination (NGPE), 2010 conducted by Indian Association of Physics Teachers. 3

4 KVPY Fellowship This fellowship is given by Department of Science and Technology, India for pursuing science career to about 100 students in the whole country and carries highest amount of scholarship INSPIRE Fellowship This fellowship is given by Department of Science and Technology, India for pursuing science career with outstanding scholastic record. visiting positions 1. Visiting Fellow, AEI, Golm, Germany April-May Worked on higher spin theories as well as higher dimensional physics. In particular whether one can have a consistent theory of higher spin and gravity in presence of higher curvature terms and in higher dimensions was the key motivation of the study Graduate School Project, IUCAA, Pune, India May-July 2014 Worked on Thermodynamical aspects of Lanzos-Lovelock gravity and submitted a project entitled Thermodynamical Variables in Lanczos-Lovelock Gravity. Advisor: Prof. Thanu Padmanabhan paddy@iucaa.in M.Sc. Project, University of Calcutta, India Jan-May 2013 Worked on alternative gravity theories in Indian Association for the Cultivation of Science (IACS) and submitted a project entitled Astrophysical Aspects of Alternative Gravity Theories. Advisor: Prof. Soumitra SenGupta tpssg@iacs.res.in Summer Project, IUCAA, Pune, India May-June 2012 Worked on Cosmic Microwave Background Anisotropies during a summer project at IUCAA entitled Cosmic Microwave Background and Sachs-Wolfe Effect. Advisor: Prof. Tarun Souradeep tarun@iucaa.in Summer Project, Presidency College, India April-June 2011 Worked on a project entitled Liquid Crystals and Phase Transition. Advisor: Prof. Prabir K. Mukherjee pkmuk1966@gmail.com Summer Project, Jadavpur University, India May-June 2010 Worked on a project entitled Particle Trajectories in Black Hole Spacetime. Advisor: Prof. Subenoy Chakraborty schakraborty.math@gmail.com brief summary of research works 4

5 Publications in Journals: 35 (5 single authored + 20 first authored). Book Chapters: 1 (1 single authored) Seminars Given: 19. Conferences Attended: 7 (4 international), 9 Oral Presentations. Conferences Organized: 1 (1 national) Research Training Schools Attended: 2 (2 international) Refereeing for Journals: Physics Letters B, European Physical Journal C, Classical and Quantum Gravity, Monthly Notices of the Royal Astronomical Society, Physics Letters A, Physics of the Dark Universe, General Relativity and Gravitation. publications (in refereed international journals) 1. Naresh Dadhich and Sumanta Chakraborty, Buchdahl compactness limit for a pure Lovelock static fluid star, Physical Review D 95, (). [arxiv: ] 2. [Book Chapter; Published in Gravity and the Quantum by Springer] Sumanta Chakraborty, Boundary Terms of the Einstein-Hilbert Action, Fundamental Theories of Physics, 187, 43 (). [arxiv: ] 3. Sourav Bhattacharya and Sumanta Chakraborty, Constraining some Horndeski gravity theories, Physical Review D 95, (). [arxiv: ] Sumanta Chakraborty and Soumitra SenGupta, Kinematics of Radion field: A possible source of dark matter, European Physical Journal C 76, 648 (2016). [arxiv: ] 5. Sumanta Chakraborty, Sourav Bhattacharya and T. Padmanabhan, Entropy of a generic null surface from its associated Virasoro algebra, Physics Letters B 763, 347 (2016). [arxiv: ] 6. Sumanta Chakraborty and Soumitra SenGupta, Spherically symmetric brane in a bulk of f(r) and Gauss-Bonnet Gravity, Classical and Quantum Gravity 33, (2016). [arxiv: ] 7. [Honorable mention by the Gravity Research Foundation] Sumanta Chakraborty and Kinjalk Lochan, Quantum leaps of black holes: Magnifying glasses of quantum gravity, International Journal of Modern Physics D 25, (2016). [arxiv: ] 8. Sumanta Chakraborty and Soumitra SenGupta, Solving higher curvature gravity theories, European Physical Journal C 76, 552 (2016). [arxiv: ] 5

6 9. Kinjalk Lochan, Sumanta Chakraborty and T. Padmanabhan, Information retrieval from black holes, Physical Review D 94, (2016). [arxiv: ] 10. Krishnamohan Parattu, Sumanta Chakraborty, Bibhas Ranjan Majhi and T. Padmanabhan, A Boundary Term for the Gravitational Action with Null Boundaries, General Relativity and Gravitation 48, 94 (2016). [arxiv: ] 11. T. Padmanabhan, Sumanta Chakraborty and Dawood Kothawala, Spacetime with zero-point length is two-dimensional at the Planck scale, General Relativity and Gravitation 48, 55 (2016). [arxiv: ] 12. Krishnamohan Parattu, Sumanta Chakraborty and T. Padmanabhan, Variational Principle for Gravity with Null and Non-null boundaries: A Unified Boundary Counter-term, European Physical Journal C 76, 129 (2016). [arxiv: ] 13. Sumanta Chakraborty and Soumitra SenGupta, Solutions on a brane in a bulk spacetime with Kalb-Ramond field, Annals of Physics 367, (2016). [arxiv: ] 14. Kinjalk Lochan and Sumanta Chakraborty, Discrete quantum spectrum of black holes, Physics Letters B 755, (2016). [arxiv: ] Sumanta Chakraborty and Naresh Dadhich, Brown-York quasilocal energy in Lanczos-Lovelock gravity and black hole horizons, Journal of High Energy Physics 1512, 003 (2015). [arxiv: ] 16. Sumanta Chakraborty and Soumitra SenGupta, Effective field equation on m-brane embedded in n-dimensional bulk of Einstein and f(r) gravity, European Physical Journal C 75, 538 (2015). [arxiv: ] 17. Sumanta Chakraborty and T. Padmanabhan, Thermodynamical interpretation of geometrical variables associated with null surfaces, Physical Review D 92, (2015). [arxiv: ] 18. Sumanta Chakraborty, Krishnamohan Parattu and T. Padmanabhan, Gravitational field equations near an arbitrary null surface expressed as a thermodynamic identity, Journal of High Energy Physics 1510, 097 (2015). [arxiv: ] 19. Sumanta Chakraborty, Aspects of Neutrino Oscillation in Alternative Gravity Theories, Journal of Cosmology and Astroparticle Physics 1510, 019 (2015). [arxiv: ] 20. Sumanta Chakraborty, Lanczos-Lovelock gravity from a thermodynamic perspective, Journal of High Energy Physics 1508, 029 (2015). [arxiv: ] 21. Sumanta Chakraborty and Soumitra SenGupta, Metric factorizability and equivalence of brane world models with Brans-Dicke theory, Physical Review D 92, (2015). [arxiv: ] 22. Sumanta Chakraborty, Suprit Singh and T. Padmanabhan, A quantum peek inside the black hole event horizon, Journal of High Energy Physics 1506, 192 (2015). [arxiv: ] 6

7 23. Sumanta Chakraborty, Equilibrium configuration of perfect fluid orbiting around black holes in some classes of alternative gravity theories, Classical and Quantum Gravity 32, (2015). [arxiv: ] 24. Sumanta Chakraborty and Soumitra SenGupta, Spherically symmetric brane spacetime in bulk f (R) gravity, European Physical Journal C 75, 11 (2015). [arxiv: ] Sumanta Chakraborty and T. Padmanabhan, Evolution of Spacetime arises due to the departure from Holographic Equipartition in all Lanczos-Lovelock Theories of Gravity, Physical Review D 90, (2014) [arxiv: ] 26. Sumanta Chakraborty and T. Padmanabhan, Geometrical variables with direct thermodynamic significance in Lanczos-Lovelock gravity, Physical Review D 90, (2014). [arxiv: ] 27. Sumanta Chakraborty and Soumitra SenGupta, Radion cosmology and stabilization, European Physical Journal C 74, 3045 (2014). [arxiv: ] 28. Sumanta Chakraborty and Soumitra SenGupta, Higher curvature gravity at the LHC, Physical Review D 90, (2014). [arxiv: ] 29. Suprit Singh and Sumanta Chakraborty, Black hole kinematics: the in vacuum energy density and flux for different observers, Physical Review D 90, (2014). [arxiv: ] 30. Sumanta Chakraborty and Soumitra SenGupta, Bulk scalar field in warped extra dimensional models, Physical Review D 89, (2014). [arxiv: ] 31. Bibhas Ranjan Majhi and Sumanta Chakraborty, Anomalous effective action, Noether current, Virasoro algebra and Horizon entropy, European Physical Journal C 74, 2867 (2014). [arxiv: ] 32. Sumanta Chakraborty, Constraining alternative gravity theories using the solar neutrino problem, Classical and Quantum Gravity 31, (2014). [arxiv: ] 33. Sumanta Chakraborty and Soumitra SenGupta, Solar system constraints on alternative gravity theories, Physical Review D 89, (2014). [arxiv: ] Sumanta Chakraborty, Velocity measurements in some classes of alternative gravity theories, Astrophysics and Space Science 347, (2013). [arxiv: ] Prabir. K. Mukherjee, Sumanta Chakraborty and Sylwester. J. Rzoska, Non-linear dielectric effect in the isotropic phase above the isotropic-cholesteric phase transition, Chemical Physics 389, (2011). [arxiv: ] 36. Sumanta Chakraborty and Subenoy Chakraborty, Trajectory around a spherically symmetric non-rotating black hole, Canadian Journal of Physics 89, (2011). [arxiv: ] 7

8 computer skills Basic Intermediate Advanced Fortran. LATEX, OpenOffice, Linux, Microsoft Windows. Mathematica. seminars given 1. On Geometry and Thermodynamics of Null Surfaces, at Albert Einstein Institute, Max Planck Institute for Gravitational Physics, Golm, 25th April, Principle of Least Action in General Relativity, at Department of Physics, IISc., Bangalore, 5th December, Information Retrieval from Black Holes, at Department of Physics, INFN and University of Trieste, Trieste, 14th June, Gravity and Thermodynamics: The Importance of being Null, at Astroparticle Physics Department, SISSA, Trieste, 9th June, Gravity and Thermodynamics: The Importance of being Null, at Department of Theoretical Physics, Indian Association for the Cultivation of science, Kolkata, 19th may, Gravity and Thermodynamics: The Importance of being Null, at Department of Theoretical Physics, Saha Institute of Nuclear Physics, Kolkata, 17th March, From Spacetime Geometry to Thermodynamics, at Physics Department, Presidency University, Kolkata, 16th March, General Relativity and Principle of Least Action, at Department of Physics, IIT Chennai, 5th November, The Dynamical Evolution of the Spacetime and Equipartition, at Theoretical Physics Department, Institute of Mathematical Sciences, Chennai, 4th November, Action Principle for General Relativity and its Relation to Null Surfaces, at Physics and Applied Mathematics Department, Indian Statistical Institute, Kolkata, 8th October, The Dynamical Evolution of the Spacetime, at Department of Theoretical Sciences, S.N. Bose Center for Basic Sciences, Kolkata, 7th October, Action Principle in General Relativity, at Theoretical Physics Department, Indian Association for the Cultivation of Science, Kolkata, 5th October,

9 13. Principle of Least Action in General Relativity, at Theoretical Physics Department, Physical Research Laboratory, Ahmedabad, 3rd September, From Spacetime Geometry to Thermodynamics, at Indian Institute of Technology, Gandhinagar, 2nd September, Extra Dimension with Radion and Torsion, at Indian Association for the Cultivation of Science, Kolkata, 30th July, A quantum peek inside the black hole event horizon, at Indian Association for the Cultivation of Science, Kolkata, 21st April, Higher Curvature Gravity: Extra Dimensions and Phenomenology at Indian Association for the Cultivation of Science, Kolkata, 21st October, From Dynamical Evolution of Spacetime to Holographic Equipartition at Indian Association for the Cultivation of Science, Kolkata, 25th September, Black Holes: The Inside Story at Department of Physics, University of Calcutta, Kolkata 24th September, conferences attended 1. Introducing zero point length to the spacetime, at 29th Meeting of Indian Association for the Cultivation of Science, IIT Guwahati, Guwahati, May, India. 2. Thermodynamics and null surfaces, at 29th Meeting of Indian Association for the Cultivation of Science, IIT Guwahati, Guwahati, May, India. 3. [Invited Talk]Boundary Terms for the Gravitational Action, at Aspects of Gravity and Cosmology, IUCAA, Pune, 7-9 March, India Information Retrieval from Black Holes, at Fundamental Problems in Quantum Physics, ICTS, Bangalore, 4-10 December, India. 5. [Invited Talk]When Mathematics Meets Physics, at National Conference on General Relativity, CCEGR-2016, Krishnagar Women s College, Krishnanagar, India, 6-7 September, Discrete Quantum Spectrum of Black Holes, at International Conference on Gravitation and Cosmology, IISER Mohali, India, December, Oral Presentation. 7. Thermodynamics of Null Surfaces, at International Conference on Gravitation and Cosmology, IISER Mohali, India, December, Oral Presentation. 8. Thermodynamic Interpretation of Geometrical Variables Associated with Null Surfaces, at the International Workshop on Advances in Astroparticle Physics and Cosmology, Saha Institute for Nuclear Physics, Kolkata, India, October, Oral Presentation. 9

10 9. Evolution of spacetime arises due to the departure from holographic equipartition in all Lanczos-Lovelock theories of gravity at the 33rd meeting of the Astronomical Society of India (ASI), National Center for Radio Astrophysics (NCRA), Pune, India, February, Oral Presentation. conferences organized 1. Organized a one day national conference on Aspects of Black Hole Physics at Indian Association for the Cultivation of Science, Kolkata, India. This was the 7th TCGCA (Topical Conference on Gravity, Cosmology and Astrophysics) meeting, which took place on 25th March,. research training schools attended 1. Attended Summer School on Cosmology held in ICTP, Trieste, 6-17 June, Attended School and Workshop on Large Scale Structure: From Galaxies to the Cosmic Web held in IUCAA, Pune, 1-12 February, letters of references The following may be consulted for Letters of References (in alphabetical order). 1. Prof. Rabin Banerjee Senior Professor and Dean (Faculty), Department of Theoretical Sciences, S.N.Bose National Center for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata , India. rabin@boson.bose.res.in 2. Prof. Naresh Dadhich Emeritus Scientist, Inter-University Center for Astronomy and Astrophysics (IUCAA), Post Bag 4, Pune University Campus, Ganeshkhind, Pune , India. nkd@iucaa.in 3. Prof. Thanu Padmanabhan (Thesis Advisor) Distinguished Professor, Inter-University Center for Astronomy and Astrophysics (IUCAA), Post Bag 4, Pune University Campus, Ganeshkhind, Pune , India. paddy@iucaa.in 4. Dr. Sudipta Sarkar Assistant Professor, Department of Physics, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar , India. sudiptas@iitgn.ac.in 10

11 5. Prof. Soumitra SenGupta Senior Professor and Dean (Academic and Students Affairs), Department of Theoretical Physics, Indian Association for the Cultivation of Science (IACS), Kolkata , India. other academic distinctions 1. Secured fifth rank in physical sciences in the National Eligibility Test (NET) conducted by CSIR-UGC, Government of India in December, Nirode Baran Bakshi memorial prize, 2011, for securing first rank from Presidency college in B.Sc. examination. 3. Awarded Millennium prize, 2011 for securing the highest percentage of marks in all science examinations by Millennium Re-Union committee of Statistics Department of Calcutta university. 4. Scindia Silver Medal, 2010 for securing highest marks in B.Sc. examination among the students of Presidency college. 5. Jyotish Ch. Chakraborti scholarship, 2009 for securing highest marks in B.Sc. examination among the students of Presidency college. IACS, Kolkata, India May 27, 11

S U M A N TA C H A K R A B O RT Y

S U M A N TA C H A K R A B O RT Y personal information Email Address Born in India, 19 March 1991 sumanta@iucaa.in; sumantac.physics@gmail.com Inter University Center for Astronomy and Astrophysics (IUCAA),