Home Page of Tejinder Pal Singh
Affiliation  Research  CV  Publications  Students  Awards  Teaching  Popular Science  Schooling
 Affiliation:
 Department of Astronomy and Astrophysics
 Tata Institute of Fundamental Research
 Homi Bhabha Road
 Mumbai 400005
 India
 Designation : Professor
 Email : tpsingh at tifr.res.in OR tejinder.tifr at gmail.com
 Address from January 1, 2023 : InterUniversity Centre for Astronomy and Astrophysics, Pune, India
 Follow @TEJINDER_TIFR
 The AIKYON Academy of Young Researchers in Foundational Physics
 Tel: +912222782600 (Office): +912222783160 (Residence)
 Research Interests :
 Quantum Gravity; Unification and division algebras; Quantum Measurement Problem and Foundations of Quantum Mechanics; Gravitation Theories with Torsion; Cosmology  The Origin of Cosmic Acceleration and Dark Energy, The Cosmological Constant Problem and the Large Scale Structure of the Universe; Gravitational Collapse and Cosmic Censorship.
 COLLOQUIUM AT TIFR: Towards the unification of the four fundamental forces, February 10, 2021 at 1600 hrs IST Link Here YouTube Recording
 COLLOQUIUM AT TIFR: Why do elementary particles have such strange looking mass ratios? , February 9, 2022 at 1600 hrs IST Slides here YouTube Recording
 RECENT ARTICLES, VIDEO LECTURES:
 A violation of the Tsirelson bound in the prequantum theory of trace dynamics
 An E8 x E8 unification of the standard model with pregravitation, on an octonionvalued twistor space Talk at Paris Conference, June, 2022
 Why do elementary particles have such strange mass ratios?  The importance of quantum gravity at low energies 
 Forthcoming invited talk: Gravitation, and quantum theory, as emergent phenomena DICE 2022. Castiglioncello, Italy, September, 2022
 Invited Review: Quantum theory without classical time: a route to quantum gravity and unification Talk at University of Regensburg, January 21, 2022
 Majorana neutrinos, Exceptional Jordan algebra, and mass ratios for charged fermions
 LeftRight symmetric fermions and sterile neutrinos from complex split biquaternions and bioctonions
 Quantum theory without classical time: octonions, and a theoretical derivation of the fine structure constant 1/137, Talk at Perimeter Institute conference on `Octonions and the standard miodel'
 Quantum gravity effects in the infrared: a theoretical derivation of the low energy fine structure constant and mass ratios of elementary particles [Preprint at Researchgate], Delhi University Talk
 Aikyons, Octonions, and Unification, BITS Pilani, Hyderabad Campus Talk, IIT Delhi Talk
 Trace dynamics and division algebras: towards quantum gravity and unification, Audio slides of Webinar at: Albert Einstein Institute, Potsdam, Monday September 21, 2020, Aikyon Theory Simplified
 Trace dynamics, and a ground state in spontaneous quantum gravity
 Octonions, trace dynamics and noncommutative geometry: a case for unification in spontaneous quantum gravity
 A basic definition for spin in the new matrix dynamics
 Why does the KerrNewman black hole have the same gyromagnetic ratio as the electron? INO Lecture
 The pollen and the electron: a study in randomness
 Nature does not play dice on the Planck scale
 Spontaneous Quantum Gravity, Video Lecture
 Blog: Schrdinger's cat and Einstein's spacetime in the twentyfirst century
 Dark energy as a large scale quantum gravitational phenomenon
 Proposal for a new quantum theory of gravity V: A testable prediction
 From quantum foundations to quantum gravity: an overview of the new theory
 Proposal for a new quantum theory of gravity IV: Black Hole Entropy
 Proposal for a new quantum theory of gravity III: Equations of quantum gravity
 Proposal for a new quantum theory of gravity II : spectral action and trace dynamics
 Quantum gravity as an emergent phenomenon
 Proposal for a new quantum theory of gravity, ASET Colloquium, An elementary account, Plausibility arguments, BITS Goa Talk
 Thinking about Quantum Gravity: YouTube Video Lecture Series Video#1 Playlist
 Outline for a quantum theory of gravity
 Spacetime from collapse of the wavefunction: Article, Blog Post
 Testing the Limits of Quantum Mechanics Article, TIFR Colloquium
 Space and time as a consequence of GRW quantum jumps
 Testing spontaneous collapse through bulk heating experiments
 Quantum theory and the structure of spacetime
 CURRENT RESEARCH (2022): THE CONNECTION BETWEEN QUANTUM FOUNDATIONS AND QUANTUM GRAVITY I am currently working on the deep theoretical connection between quantum foundations, and the sought for quantum theory of gravity. And I collaborate with experimentalists to test these ideas in the laboratory, and in the cosmological setting, as also in the context of black hole physics. Quantum theory, despite being extremely successful and agreeing with every experiment to date, poses difficult unresolved conceptual issues: the nature of the quantumtoclassical transition, the absence of position superpositions in the macroscopic world, quantum nonlocality, and the problem of time in quantum theory. I have argued that addressing these issues points us towards the sought for quantum theory of gravity. Some of these issues have been addressed by spontaneous collapse theories, which provide a unified description of classical and quantum dynamics, by suggesting that the principle of quantum linear superposition is approximate, not exact. These theories are falsifiable, and are currently being tested in the laboratory. We have shown that the resolution of the problem of time in quantum theory guides us towards quantum gravity, and spontaneous localisation plays an important role in bridging the quantum gravitational world and the classical one. We have predicted the intriguing phenomenon of quantum interference in time, and spontaneous collapse in time  these are in principle testable in the laboratory, and constitute a test of quantum gravity. These ideas also seem to have important implications for black hole physics and cosmology, which are currently being investigated. You can get more information on these works from the articles listed above, and from my ongoing YouTube video lecture series `Thinking about Quantum Gravityâ€™.
 CV: Detailed CV
 Date of Birth : 23rd July, 1962
 Masters in Physics [Five Year Integrated Programme] : IIT, Delhi (19791984)
 Ph. D. in Physics : TIFR, Mumbai (19841989)
 PostDoctoral Fellow at ICTP, Trieste : 198990
 Faculty Member at TIFR since 1989
 List of Publications :
 PDF file
 Link to Spires Database
 Link to Google Scholar
 Graduate Student(s): 
 Past Graduate Students :
 Srimanta Banerjee
 Sayantani Bera (postdoc, IUCAA, Pune)
 Shreya Banerjee (postdoc, Ben Gurion University, Israel)
 Priti Mishra [Faculty, Patna University]
 Kinjalk Lochan [Faculty, IISER Mohali]
 Aseem Paranjape [The Jurgen Ehlers Thesis Prize 2013 from International Society of General Relativity and Gravitation; Faculty, IUCAA, Pune]
 Rakesh Tibrewala [Faculty, LNMIIT, Jaipur ]
 Sashideep Gutti [Faculty, BITS Hyderabad]
 Sukratu Barve [Faculty, Univ. of Pune]
 Awards and Recognition :
 CBSE HSC Examination (1977) : AllIndia Rank 11
 CBSE Senior Secondary Examination [1979] : AllIndia Rank 3
 IIT Delhi Silver Medal [1984]
 Gravity Research Foundation [USA] Essay Contest :
 3rd Prize (1998)
 4th Prize (2004) [jointly with Cenalo Vaz, Cincinnati]
 2nd Prize (2008)
 Center for Excellence Visiting Scholar, Yukawa Institute for Theoretical Physics, Kyoto [Aug.Oct. 2000]
 Fourth Prize in 2009 Essay Contest of the Foundational Questions Institute (USA)
 4th Prize in FQXi essay contest 2011
 4th Prize in FQXi essay contest 2012, jointly with Angelo Bassi and Hendrik Ulbricht
 2nd Prize in FQXi essay contest 2013, jointly with Angelo Bassi and Saikat Ghosh
 3rd Prize in FQXi eessay contest 2014
 Creative Thinking Prize in FQXi essay contest 2015, jointly with Anshu Gupta Mujumdar
 4th Prize in FQXi essay contest 2018

 John Templeton Foundation project grant for research on `Quantum physics and the nature of reality' [20112013]
 Coinvestigator: John Templeton Foundation project grant for research on 'Experimental and theoretical exploration of fundamental limits of quantum mechanics' PI: Hendrik Ulbricht (Southampton), Coinvestigator: Angelo Bassi (Trieste) 20132016
 Member, Foundational Questions Institute, USA
 Teaching [Graduate Courses at TIFR]:
 Classical Electrodynamics [1993]
 Astronomy and Astrophysics [1995]
 Classical Electrodynamics [1998]
 Statistical Mechanics [2001]
 Classical Mechanics [2003]
 Statistical Mechanics [2009]
 General Relativity and Cosmology [2013]
 Some Popular Science Articles / Podcast / Youtube Video:
 Special Relativity for the SchoolGoing Child
 Quantum theory and the Cosmological Constant
 Quantum theory, gravity, and the standard model of particle physics
 FQXi Lecture 'Quantum measurement and quantum gravity'
 FQXI Podcast: Testing the quantum limits
 YouTube Video: Does Nature Play Dice?
 Schooling :
 Kendriya Vidyalaya No. 1, Ambala Cantonment, 197579
 Kendriya Vidyalaya, BHU Varanasi, 197475
 Kendriya Vidayala, Babina Cantonment, 197374
 Shalini Preparatory School, Clement Town, Dehradun, 196972