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  • Ali, Ahmed Farag; Das, Saurya; Vagenas, Elias C. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeAcademy of Athens, 2015-12-22)
    In this article we examine a Generalized Uncertainty Principle which differs from the Heisenberg Uncertainty Principle by terms linear and quadratic in particle momenta, as proposed by the authors in an earlier paper. ...
  • Balasubramanian, Venkat; Das, Saurya; Vagenas, Elias C. (Arts and ScienceDepartment of Physics and AstronomyUniversity of Western OntarioUniversity of LethbridgeKuwait University, 2015-12-16)
    In this work we explore the self-adjointness of the GUP-modified momentum and Hamiltonian oper- ators over different domains. In particular, we utilize the theorem by von-Newmann for symmetric operators in order to ...
  • Vagenas, Elias C.; Das, Saurya (Arts and ScienceDepartment of PhysicsUniversity of AthensUniversity of Lethbridge, 2016-01-06)
    Motivated by the recent work of Robinson and Wilczek, we evaluate the gravitational anomaly of a chiral scalar field in a Vaidya spacetime of arbitrary mass function, and thus the outgoing flux from the time-dependent ...
  • Das, Saurya; Robinson, Sean P.; Vagenas, Elias C. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeMassachusetts Institute of TechnologyUniversity of Athens, 2016-01-07)
    We explore the method of Robinson andWilczek for deriving the Hawking temperature of a black hole. In this method, the Hawking radiation restores general covariance in an effective theory of near-horizon physics which ...
  • Das, Saurya; Gegenberg, Jack (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeUniversity of New Brunswick, 2016-01-25)
    We derive general conditions under which geodesics of stationary spacetimes resemble trajectories of charged particles in an electromagnetic field. For large curvatures (analogous to strong magnetic fields), the quantum ...
  • Das, Saurya; Shankaranarayanan, S. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeThe Abdus Salam International Centre for Theoretical Physics, 2015-12-23)
    We compute the high frequency quasi-normal modes (QNM) for scalar perturbations of spherically symmetric single horizon black-holes in (D+2)-space-time dimensions with generic curvature singularities and having metrics ...
  • Ghosh, Archisman; Shankaranarayanan, S.; Das, Saurya (Arts and ScienceDepartment of PhysicsIndian Institute of Technology KanpurThe Abdus Salam International Centre for Theoretical PhysicsUniversity of Lethbridge, 2016-01-05)
    The possibility that the asymptotic quasi-normal mode (QNM) frequencies can be used to obtain the Bekenstein-Hawking entropy for the Schwarzschild black hole — commonly referred to as Hod’s conjecture — has received ...
  • Cavagalià, Marco; Das, Saurya (Arts and ScienceDepartment of PhysicsUniversity of MississippiUniversity of Lethbridge, 2015-12-23)
    We show that the Hawking temperature and the entropy of black holes are subject to corrections from two sources: the generalized uncertainty principle and thermal fluctuations. Both effects increase the temperature and ...
  • Das, Saurya; Shankaranarayanan, S. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeInternational Centre for Theoretical Physics, 2016-01-25)
    We revisit the problem of finding the entanglement entropy of a scalar field on a lattice by tracing over its degrees of freedom inside a sphere. It is known that this entropy satisfies the area law – entropy proportional ...
  • Ahmadi, Morteza; Das, Saurya; Shankaranarayanan, S. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeInternational Centre for Theoretical Physics, 2016-01-25)
    It is known that the entanglement entropy of a scalar field, found by tracing over its degrees of freedom inside a sphere of radius R, is proportional to the area of the sphere (and not its volume). This suggests that ...
  • 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 ...
  • 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; 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 (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. ...

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