Parampreet Singhsingh

Professor of Physics &

Adjunct Faculty at Center for Computation and Technology, LSU

Ph.D., 2004 - Inter-University Center for Astronomy & Astrophysics (IUCAA),
University of Pune

Louisiana State University
Department of Physics & Astronomy
347 Nicholson Hall, Tower Dr.
Baton Rouge, LA 70803-4001
225-578-7513-Office
psingh@phys.lsu.edu

Pesonal Webpage:

https://www.phys.lsu.edu/faculty/psingh/index.html

Gravity Workshop 2023

Research Interests

Quantum Gravity & Cosmology

Questions about the origin of our universe, spacetime beyond the big bang, and the fate of black hole singularities are perhaps the most fundamental questions whose answers have remained elusive  for many decades. It is expected that a union of quantum and gravity would provide insights on these fundamental problems. However, this task is challenging and difficult not only because of unfinished candidate theories of quantum gravity, but also because of lack of direct experimental signatures. Further, a challenge in this exercise is to how to implement quantum theory in a closed system of our universe.

My research aims to address these issues by: (i) understanding the unification in a systematic way by quantizing non-trivial model spacetimes with increasing complexity, such as isotropic, anisotropic and black hole spacetimes; (ii) exploring the implications of quantum gravity for singularity resolution; (iii) understanding the fate of gravitational collapse in a quantum spacetimes; (iv) exploring phenomenological consequences of new physics being extracted at Planck scale including for the cosmic microwave background; (v) understanding the connection between modified gravity and quantum gravity, and the dynamical equations using methods of inverse problems; and (v) developments on consistent histories formulation of quantum theory to extract consistent probabilities in a quantum spacetimes.

My research involves a combination of analytical and high performance computational methods, and aims to cover answers in all the domains of the above field, including foundational,  phenomenological, technical  and conceptual questions. (For more information, please visit my personal home page).

Current (Since 2013) and Select Publications

  • Parampreet Singh, Is classical flat Kasner spacetime flat in quantum gravity? Int. J. Mod. Phys. D 25 1642001 (2016) (Special issue on Loop Quantum Cosmology )

  • Parampreet Singh and S. K. Soni,  On the relationship between the modifications to the Raychaudhuri equation and the canonical Hamiltonian structures,  Class. Quant. Grav 33 125001 (2016)

  • Alejandro Corichi and Parampreet Singh,  Loop quantization of the Schwarzschild interior revisited, Class. Quant. Grav. 33 055006 (2016)

  • Naresh Dadhich, Anton Joe and Parampreet Singh,  Emergence of product of constant curvature spaces in loop quantum cosmology, Class. Quant. Grav. 32, 185006 (2015)

  • Anton Joe, Parampreet Singh, Kantowski-Sachs spacetime in loop quantum cosmology: bounds on expansion and shear scalars and the viability of quantization,  Class. Quant. Grav. 32 015009 (2015)

  • Parampreet Singh,  Loop quantum cosmology and the fate of cosmological singularities, (Invited review article based on Vainu Bappu Gold Medal Award lecture), Bull. Astr. Soc. India 42 121 (2014)

  • Peter Diener, Brajesh Gupt, Miguel Megevand, Parampreet Singh, Numerical evolution of squeezed and non-Gaussian states in loop quantum cosmology ,  Class. Quant. Grav. 31 165006 (2014)

  • Peter Diener, Brajesh Gupt, Parampreet Singh, Numerical simulations of a loop quantum cosmos: robustness of the quantum bounce and the validity of effective dynamics, Class. Quant. Grav. 31,105015 (2014)

  • Parampreet Singh, Edward Wilson-Ewing, Quantization ambiguities and bounds on geometric scalars in anisotropic loop quantum cosmology, Class. Quant. Grav. 31, 035010 (2014)

  • Peter Diener, Brajesh Gupt, Parampreet Singh, Chimera: A hybrid approach to numerical loop quantum cosmology,  Class. Quant. Grav. 31, 025013 (2014)

  • Brajesh Gupt, Parampreet Singh,  Non-singular AdS-dS transitions in a landscape scenario, Phys. Rev. D 89, 063520 (2014)

  • David Craig, Parampreet Singh, Consistent probabilities in loop quantum cosmology, , Class. Quant. Grav. 30, 205008 (2013)

  • Brajesh Gupt, Parampreet Singh, A quantum gravitational in inflationary scenario in Bianchi-I spacetime,  Class. Quant. Grav. 30, 145013 (2013)

  • Parampreet Singh, Numerical loop quantum cosmology: an overview, (Invited review), , Class. Quant. Grav. 29 244002 (2012)

  • Parampreet Singh, Curvature invariants, geodesics and the strength of singularities in Bianchi-I loop quantum cosmology, Phys. Rev. D 85 104011 (2012)

  • Abhay Ashtekar, Parampreet Singh, Loop quantum cosmology: a status report, (Invited topical review), Class. Quant. Grav. 28, 213001 (2011)

  • Parampreet Singh, Are loop quantum cosmos never singular?, Class. Quant. Grav. 26, 125005 (2009); Selected for Research Highlights of 2008-2009 by Classical and Quantum Gravity

  • Alejandro Corichi, Parampreet Singh, Quantum bounce and cosmic recall, Phys. Rev. Lett. 100, 161302 (2008)

  • Abhay Ashtekar, Alejandro Corichi, Parampreet Singh, Robustness of key features of loop quantum cosmology, Phys. Rev. D 77, 024046 (2008)

  • Alejandro Corichi, Parampreet Singh, Is loop quantization in cosmology unique?,  Phys. Rev. D 78 024034 (2008)

  • Abhay Ashtekar, Tomasz Pawlowski, Parampreet Singh, Quantum nature of the Big Bang: improved dynamics,  Phys. Rev. D 74, 084003 (2006)

  • Parampreet Singh,  Loop cosmological dynamics and dualities with Randall-Sundrum braneworlds, Phys. Rev. D 73, 063508 (2006)

  • Rituparno Goswami, Pankaj S. Joshi, Parampreet Singh, Quantum evaporation of a naked singularity,  Phys. Rev. Lett. 96, 031302 (2005)

  • Martin Bojowald, Rituparno Goswami, Roy Maartens, Parampreet Singh, A black hole mass thresh-old from non-singular quantum gravitational collapse, Phys. Rev. Lett. 95, 091302 (2005)

  • Shinji Tsujikawa, Parampreet Singh, Roy Maartens, Loop quantum gravity effects on inflation and the CMB,  Class. Quant. Grav. 21, 5767 (2004)

  • Jeeva Anandan, Naresh Dadhich, Parampreet Singh, Action principle formulation for motion of extended bodies in General Relativity, Phys.Rev. D 68, 124014 (2003)

  • Parampreet Singh, M. Sami, Naresh Dadhich, Cosmological dynamics of phantom field,  Phys. Rev. D 68, 023522 (2003)

 

LSU