Home Page of Tejinder Pal Singh

Affiliation | Research | CV | Publications | Students | Awards | Teaching | Popular Science | Schooling

Department of Astronomy and Astrophysics
Tata Institute of Fundamental Research
Homi Bhabha Road
Mumbai 400005
Designation : Professor
Email : tpsingh at tifr.res.in
Tel: +91-22-22782600 (Office): +91-22-22783160 (Residence)
Research Interests :
Quantum Gravity; 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.
Space-time from collapse of the wave-function: 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 space-time
Comment on `A Universe that does not know the time'
Research In Brief :
The quantum measurement problem: what is the explanation for the apparent collapse of the wave function during a quantum measurement? What is the origin of the Born probability rule?
The concept of time is a classical concept, external to quantum mechanics. There ought to exist a reformulation of quantum mechanics which does not refer to an external classical time. Such a reformulation can be shown to be the limiting case of a nonlinear quantum theory, with the nonlinearity becoming important at the Planck mass/energy scale. The nonlinearity can possibly explain the collapse of the wave-function during a quantum measurement, and predicts a finite superposition lifetime for superposed states of mesoscopic quantum systems. These ideas could be tested by ongoing laboratory experiments in the near future. [Ref. arXiv:0711.3773 and Reviews of Modern Physics 85, 471 (2013) arXiv:1204.4325]
We do not understand what is causing the Universe to undergo an accelerated expansion today. The simplest explanation, namely that this is an apparent effect resulting from averaging of inhomogeneities, does not seem to work [Paranjape and Singh, Phys. Rev. Lett. 101, 181101 (2008)]. Could the acceleration be an apparent effect because we live in a huge void? Could it be due to a very tiny cosmological constant, whose extremely small but non- zero value can be derived from quantum gravity?
Classical general relativity seems to admit the formation of naked singularities. What are the possible astrophysical signatures of such naked singularities, if any?
CV: Detailed CV
Date of Birth : 23rd July, 1962
Masters in Physics [Five Year Integrated Programme] : IIT, Delhi (1979-1984)
Ph. D. in Physics : TIFR, Mumbai (1984-1989)
Post-Doctoral Fellow at ICTP, Trieste : 1989-90
Faculty Member at TIFR since 1989
List of Publications :
PDF file
Link to Spires Database
Link to Google Scholar
Graduate Student(s):
Srimanta Banerjee
Sayantani Bera
Shreya Banerjee
Past Graduate Students :
Priti Mishra [Faculty, Patna University]
Kinjalk Lochan [DST-INSPIRE 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) : All-India Rank 11
CBSE Senior Secondary Examination [1979] : All-India 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' [2011-2013]

Co-investigator: John Templeton Foundation project grant for research on 'Experimental and theoretical exploration of fundamental limits of quantum mechanics' PI: Hendrik Ulbricht (Southampton), Co-investigator: Angelo Bassi (Trieste) 2013-2016

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 School-Going 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, 1975-79
Kendriya Vidyalaya, BHU Varanasi, 1974-75
Kendriya Vidayala, Babina Cantonment, 1973-74
Shalini Preparatory School, Clement Town, Dehradun, 1969-72