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  • Sur, Sourav; Das, Saurya (Arts and ScienceDepartment of PhysicsUniversity of Lethbridge, 2015-12-15)
    We investigate models of dark energy with purely kinetic multiple k- essence sources that allow for the crossing of the phantom divide line, without violating the conditions of stability. It is known that with more than ...
  • Das, Saurya; Kaul, Romesh K.; Majumdar, Parthasarathi (American Institute of PhysicsPennsylvania State UniversityThe Institute of Mathematical Sciences (India), 2001)
    A new entropy bound, tighter than the standard holographic bound due to Bekenstein, is derived for spacetimes with nonrotating isolated horizons from the quantum geometry approach, in which the horizon is described by ...
  • Bhaduri, Rajat K.; Tran, Muoi N.; Das, Saurya (Arts and ScienceDepartment of PhysicsMcMaster UniversityUniversity of Lethbridge, 2016-01-25)
    It has been suggested recently that the microcanonical entropy of a system may be accurately reproduced by including a logarithmic correction to the canonical entropy. In this paper we test this claim both analytically ...
  • Das, Saurya; Vagenas, Elias C. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeAcademy of Athens, 2016-01-18)
    Various theories of Quantum Gravity argue that near the Planck scale, the Heisenberg Uncertainty Principle should be replaced by the so called Generalized Uncertainty Principle (GUP).We show that the GUP gives rise to ...
  • Kohler, M.; Habart, E.; Arab, H.; Bernard-Salas, J.; Ayasso, H.; Abergel, A.; Zavagno, A.; Polehampton, E.; van der Wiel, M.H.D.; Naylor, David A.; Makiwa, Gibion; Dassas, K.; Joblin, C.; Pilleri, P.; Berne, O.; Fuente, A.; Gerin, M.; Goicoechea, J.R.; Teyssier, D. (Springer-Verlag, 2014)
    Context. The determination of the physical conditions in molecular clouds is a key step towards our understanding of their formation and evolution of associated star formation. We investigate the density, temperature, and ...
  • Das, Saurya; Mann, R. B. (Arts and ScienceDepartment of Physics and AstronomyUniversity of LethbridgeUniversity of Waterloo, 2016-01-19)
    Almost all theories of Quantum Gravity predict modifications of the Heisenberg Uncertainty Principle near the Planck scale to a so-called Generalized Uncertainty Principle (GUP). Recently it was shown that the GUP gives ...
  • Das, Saurya; Dasgupta, Arundhati; Ramadevi, P.; Sarkar, Tapobrata (Elsevier BV North HollandInstitute of Mathematical Sciences (India)International Centre for Theoretical PhysicsTata Institute of Fundamental Research, 1988)
    We consider the gravitational scattering of point particles in four dimensions, at Planckian centre of mass energy and low momentum transfer, or the eikonal approximation. The scattering amplitude can be exactly computed ...
  • Das, Saurya; Shankaranarayanan, S.; Sur, Sourav (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeMax-Planck-Institut für Gravitationphysik, 2015-12-22)
    We re-examine the idea that the origin of black-hole entropy may lie in the entanglement of quantum fields between inside and outside of the horizon. Motivated by the observation that certain modes of gravitational ...
  • Ali, Ahmed Farag; Das, Saurya; Vagenas, Elias C. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeAcademy of Athens, 2015-12-22)
    Attempts to formulate a quantum theory of gravitation are collectively known as quantum gravity. Various approaches to quantum gravity such as string theory and loop quantum gravity, as well as black hole physics and ...
  • Das, Saurya; Vagenas, Elias C. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeAcademy of Athens, 2015-12-22)
    We argue that a quantum aether is consistent with the principle of relativity and can provide an economical way of having an invariant quantum gravity or Planck scale. We also show that it may change the effective scale ...
  • Basilakos, Spyros; Das, Saurya; Vagenas, Elias C. (Arts and ScienceDepartment of Physics and AstronomyAcademy of AthensUniversity of Lethbridge, 2016-01-19)
    We investigate the effects of Quantum Gravity on the Planck era of the universe. In particular, using different versions of the Generalized Uncertainty Principle and under specific conditions we find that the main Planck ...
  • Das, Saurya; Ramadevi, P.; Yajnik, U. A.; Sule, A. (ElsevierUniversity of New BrunswickIndian Institute of Technology Bombay, 2003)
    It has been argued by several authors, using different formalisms, that the quantum mechanical spectrum of black hole horizon area is discrete and uniformly spaced. Recently it was shown that two such approaches, namely ...
  • Barvinsky, Andrei; Das, Saurya; Kunstatter, Gabor (ElsevierLebedev Physics Institute and Lebedev Research Center in PhysicsUniversity of Winnipeg, 2001)
    We quantize the spherically symmetric sector of generic charged black holes. Thermal properties are incorporated by imposing periodicity in Euclidean time, with period equal to the inverse Hawking temperature of the black ...
  • Das, Saurya (Arts and ScienceDepartment of PhysicsUniversity of Lethbridge, 2015-12-22)
    We compute quantum corrections to the Raychaudhuri equation by replacing classical geodesics with quantal (Bohmian) trajectories, and show that they prevent focusing of geodesics, and the formation of conjugate points. ...
  • Das, Saurya; Dey, Anindya; SenGupta, Soumitra (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeHarish-Chandra Research InstituteIndian Association for the Cultivation of Science, 2016-01-27)
    We show that when the antisymmetric Kalb-Ramond field is included in the Randall-Sundrum scenario, although the hierarchy problem can be solved, it requires an extreme fine tuning of the Kalb-Ramond field (about 1 part ...
  • Das, Saurya; Dey, Anindya; SenGupta, Soumitra (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeHarish-Chandra Research InstituteIndian Association for the Cultivation of Science, 2015-12-16)
    We re-examine the fine tuning problem of the Higgs mass, when an antisymmetric two form Kalb-Ramond (KR) field is present in the bulk of a Randall-Sundrum (RS) braneworld. Taking into account the back-reaction of the KR ...
  • Alberto, Pedro; Das, Saurya; Vagenas, Elias C. (Arts and ScienceDepartment of Physics and AstronomyUniversidade de CoimbraUniversity of LethbridgeAcademy of Athens, 2015-12-15)
    We generalize the work of Alberto, Fiolhais and Gil and solve the problem of a Dirac particle confined in a 3-dimensional box. The non-relativistic and ultra-relativistic limits are considered and it is shown that the ...
  • Das, Saurya; Vagenas, Elias C. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeAcademy of Athens, 2015-12-15)
    We address the three points raised by the authors of the above Comment (ref.[1]).
  • Das, Saurya; Gegenberg, J.; Husain, V. (American Physical SocietyUniversity of WinnipegUniversity of New Brunswick, 2001)
    We describe a class of asymptotically AdS scalar field spacetimes, and calculate the associated conserved charges for three, four and five spacetime dimensions using the conformal and counterterm prescriptions. The energy ...
  • Das, Saurya; Majumdar, Parthasarathi (Elsevier BV North HollandInstitute of Mathematical Sciences (India)International Centre for Theoretical Physics, 1995)
    We consider possible mixing of electromagnetic and gravitational shock waves, in the Planckian energy scattering of point particles in Minkowski space, By boosting a Reissner-Nordstriim black hole solution to the velocity ...

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