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Browsing by Author "Das, Saurya"

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Browsing by Author "Das, Saurya"

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  • Das, Saurya; Kobes, Randy; Kunstatter, Gabor (American Physical SocietyUniversity of WinnipegWinnipeg Institute for Theoretical Physics, 2002)
    We show that by a suitable choice of a time-dependent Hamiltonian, Deutsch’s algorithm can be implemented by an adiabatic quantum computer. We extend our analysis to the Deutsch-Jozsa problem and estimate the required ...
  • Ahmadi, Morteza; University of Lethbridge. Faculty of Arts and Science (Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2006Arts and SciencePhysics, 2006)
    In this thesis, aspects of the physics of black holes are reviewed and new results in black hole thermodynamics are presented. First, general black hole solutions of Einstein’s equations of general relativity are mentioned ...
  • Das, Saurya; Majumdar, Parthasarathi (Indian Academy of SciencesInstitute of Mathematical Sciences (India), 1998)
    We discuss an approach to compute two-particle scattering amplitudes for spinless light particles colliding at Planckian centre-of-mass energies, with increasing momentum transfer away from the eikonal limit. The leading ...
  • Ali, Ahmed Farag (Lethbridge, Alta. : University of Lethbridge, Dept. of Physics and Astronomy, c2012Arts and ScienceDepartment of Physics and Astronomy, 2012)
    We propose a Generalized Uncertainty Principle (GUP) consistent with String Theory, Black Hole Physics and Doubly Special Relativity. This modifies all quantum mechanical Hamiltonians and predicts quantum gravity corrections. ...
  • Deb, Soumen (Lethbridge, Alta. : University of Lethbridge, Dept. of Physics and AstronomyArts and ScienceDepartment Physics and Astronomy, 2015)
    Quantum gravity effects modify the Heisenberg's uncertainty principle to the generalized uncertainty principle (GUP). Earlier work showed that the GUP-induced corrections to the Schrödinger equation, when applied to a ...
  • Das, Saurya; Dasgupta, Arundhati (SISSAPennsylvania State UniversityInstitute of Mathematical Sciences (India), 1999)
    We study the emission rates of scalar, spinor and vector particles from a 5 dimensional black hole for arbitrary partial waves. The solution is lifted to 6 dimensions, and the near horizon BTZ S3 geometry of the black ...
  • Das, Saurya; Shankaranarayanan, S.; Sur, Sourav (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeUniversity of Portsmouth, 2016-01-07)
    We review aspects of the thermodynamics of black holes and in particular take into account the fact that the quantum entanglement between the degrees of freedom of a scalar field, traced inside the event horizon, can be ...
  • Das, Saurya (Arts and ScienceDepartment of PhysicsUniversity of Lethbridge, 2015-12-16)
    We review some recent advances in black hole thermodynamics, including statistical mechanical origins of black hole entropy and its leading order corrections, from the viewpoints of various quantum gravity theories. We ...
  • Das, Saurya; Patitsas, Steve N. (Arts and ScienceDepartment of Physics and AstronomyUniversity of Lethbridge, 2015-12-15)
    The extremely small accelerations of objects required for the the onset of modified Newtonian dynamics, or MOND, makes testing the hypothesis in conventional terrestrial laboratories virtually impossible. This is due to ...
  • Sur, Sourav; Das, Saurya; SenGupta, Soumitra (Arts and ScienceDepartment of PhysicsInstitute of PhysicsUniversity of LethbridgeIndian Association for the Cultivation of Science, 2015-12-16)
    We study generic Einstein-Maxwell-Kalb-Ramond-dilaton actions, and derive conditions under which they give rise to static, spherically symmetric black hole solutions. We obtain new asymptotically flat and non-flat black ...
  • Sidhu, Steve (Lethbridge, Alta. : University of Lethbridge, Dept. of Physics and Astronomy, c2012Arts and ScienceDepartment of Physics and Astronomy, 2012)
    This thesis reviews the use of 2-dimensional conformal field theory applied to gravity, specifically calculating Bekenstein-Hawking entropy of black holes in (2+1) dimensions. A brief review of general relativity, Conformal ...
  • Das, Saurya; Mann, Robert B. (SISSAPennsylvania State UniversityUniversity of Waterloo, 2000)
    We compute the conserved charges for Kerr anti-de Sitter spacetimes in various dimensions using the conformal and the counterterm prescriptions. We show that the conserved charge corresponding to the global timelike ...
  • Das, Saurya (Arts and ScienceDepartment of Physics and AstronomyUniversity of Lethbridge, 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 ...
  • Das, Saurya; Maity, Debaprasad; SenGupta, Soumitra (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeThe Institute of Mathematical Sciences (India)Indian Association for the Cultivation of Science, 2015-12-22)
    We consider a generalized Randall Sundrum (RS) brane world scenario with a cosmological constant induced on the visible brane. We show that for < 0, resolution of the hierarchy problem requires an upper bound on the ...
  • 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; Vagenas, Elias C.; Ali, Ahmed Farag (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeAcademy of Athens, 2015-12-22)
    Various theories of Quantum Gravity predict modifications of the Heisenberg Uncertainty Prin- ciple near the Planck scale to a so-called Generalized Uncertainty Principle (GUP). In some recent papers, we showed that the ...
  • Ali, Ahmed Farag; Das, Saurya; Vagenas, Elias C. (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeAcademy of Athens, 2015-12-15)
    Various approaches to Quantum Gravity (such as String Theory and Doubly Special Relativity), as well as black hole physics predict a minimum measurable length, or a maximum observable momentum, and related modifications ...
  • Chemissany, Wissam; Das, Saurya; Ali, Ahmed Farag; Vagenas, Elias C. (Arts and ScienceDepartment of Physics and AstronomyKatholieke Universiteit LeuvenUniversity of LethbridgeAcademy of Athens, 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 ...
  • Das, Saurya; Majumdar, Parthasarathi (American Physical SocietyInstitute of Mathematical Sciences (India), 1997)
    Approximating light charged pointlike particles in terms of ~nonextremal! dilatonic black holes is shown to lead to certain pathologies in Planckian scattering in the eikonal approximation, which are traced to the presence ...
  • Das, Saurya; Shankaranarayanan, S.; Sur, Sourav (Arts and ScienceDepartment of PhysicsUniversity of LethbridgeUniversity of PortsmouthSaha Institute of Nuclear Physics, 2016-01-18)
    In this talk, we focus on the corrections to Bekenstein-Hawking entropy by associating it with the entanglement between degrees of freedom inside and outside the horizon. Using numerical techniques, we show that the ...