Browsing Physics & Astronomy by Issue Date

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  • Cavagalià, Marco; Das, Saurya (Arts and ScienceDepartment of PhysicsUniversity of MississippiUniversity of Lethbridgehttps://doi.org/10.1088/0264-9381/21/19/001, 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 (Arts and ScienceDepartment of Physics and AstronomyUniversity of Lethbridgehttps://doi.org/10.1142/S0218271814420176, 2015-12-23)
    Using the quantum corrected Friedmann equation, obtained from the quantum Raychudhuri equation, and assuming a small mass of the graviton (but consistent with observations and theory), we propose a resolution of the ...
  • van der Wiel, M. H. D.; Naylor, David A.; Makiwa, Gibion; Satt, M.; Abergel, A. (EDP SciencesArts and ScienceDepartment of Physics & AstronomyUniversity of CopenhagenUniversity of LethbridgeUniversity of RomeUniversité Paris-Saclay10.1051/0004-6361/201628512, 2016)
    Context. The HF molecule has been proposed as a sensitive tracer of diffuse interstellar gas, while at higher densities its abundance could be influenced heavily by freeze-out onto dust grains. Aims. We investigate the spatial ...
  • Deb, Soumen; Das, Saurya; Vagenas, Elias C. (ElsevierArts and ScienceDepartment of Physics & AstronomyUniversity of LethbridgeKuwait University, 2016)
    Quantum gravity effects modify the Heisenberg's uncertainty principle to a generalized uncertainty principle (GUP). Earlier work showed that the GUP-induced corrections to the Schrödinger equation, when applied to a ...
  • Ghosh, Archisman; Shankaranarayanan, S.; Das, Saurya (Arts and ScienceDepartment of PhysicsIndian Institute of Technology KanpurThe Abdus Salam International Centre for Theoretical PhysicsUniversity of Lethbridgehttps://doi.org/10.1088/0264-9381/23/6/003, 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 ...
  • Das, Saurya; Shankaranarayanan, S. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeMax-Planck-Institut für Gravitationphysikhttps://doi.org/10.1088/0264-9381/24/20/022, 2016-01-06)
    Understanding the area-proportionality of black hole entropy (the ‘Area Law’) from an underlying fundamental theory has been one of the goals of all models of quantum gravity. A key question that one asks is: where are ...
  • 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; Vagenas, Elias C. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeAcademy of Athenshttps://doi.org/10.1139/P08-105, 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 ...
  • 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 ...
  • Chemissany, Wissam; Das, Saurya; Ali, Ahmed Farag; Vagenas, Elias C. (Arts and ScienceDepartment of Physics and AstronomyKatholieke Universiteit LeuvenUniversity of LethbridgeAcademy of Athenshttps://doi.org/10.1088/1475-7516/2011/12/017, 2016-01-19)
    We examine effects of the Generalized Uncertainty Principle, predicted by various theories of quantum gravity to replace the Heisenberg’s uncertainty principle near the Planck scale, on post inflation preheating in ...
  • Basilakos, Spyros; Das, Saurya; Vagenas, Elias C. (Arts and ScienceDepartment of Physics and AstronomyAcademy of AthensUniversity of Lethbridgehttps://doi.org/10.1088/1475-7516/2010/09/027, 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 ...
  • Ali, Ahmed Farag; Das, Saurya (Arts and ScienceDepartment of Physics and AstronomyBenha UniversityUniversity of Lethbridge, 2016-01-20)
    It was shown recently that replacing classical geodesics with quantal (Bohmian) trajectories gives rise to a quantum corrected Raychaudhuri equation (QRE). Here we derive the second order Friedmann equations from the ...
  • Das, Saurya; Shankaranarayanan, S. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeInternational Centre for Theoretical Physicshttps://doi.org/10.1103/PhysRevD.73.121701, 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 Physicshttps://doi.org/10.1139/p06-002, 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 ...
  • Bhaduri, Rajat K.; Tran, Muoi N.; Das, Saurya (Arts and ScienceDepartment of PhysicsMcMaster UniversityUniversity of Lethbridgehttps://doi.org/10.1103/PhysRevD.69.104018, 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; Gegenberg, Jack (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeUniversity of New Brunswickhttps://doi.org/10.1007/s10714-008-0619-3, 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; Dey, Anindya; SenGupta, Soumitra (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeHarish-Chandra Research InstituteIndian Association for the Cultivation of Sciencehttps://doi.org/10.1088/1742-6596/68/1/012009, 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 ...