Das, Saurya; Majumdar, Parthasarathi(American Physical SocietyInstitute of Mathematical Sciences, 1994)
The amplitude for the scattering of a point magnetic monopole and a point charge, at center-of-
mass energies much larger than the masses of the particles, and in the limit of low momentum
transfer, is shown to be ...
Das, Saurya; Majumdar, Parthasarathi(American Physical SocietyInstitute of Mathematical SciencesInternational Centre for Theoretical Physics, 1995)
The scattering of pointlike particles at a very large center-of-mass energies and fixed low momentum transfers, occurring due to both their electromagnetic and gravitational interactions, is reexamined in the particular ...
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 ...
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; 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 ...
Das, Saurya; Dasgupta, Arundhati; Sarkar, Tapobrata(American Physical SocietyArts and ScienceInstitute of Mathematical Sciences (India), 1997)
We study the emission of scalar particles from a class of near-extremal five-dimensional black holes and the
corresponding D-brane configuration at high energies. We show that the distribution functions and the black
hole ...
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; 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; 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 ...
Das, Saurya; Ghosh, Amit; Mitra, P.(American Physical SocietyPennsylvania State UniversitySaha Institute of Nuclear Physics (Kolkata, India), 2000)
The statistical entropy of a Schwarzschild black string in five dimensions is obtained by counting the black
string states which form a representation of the near-horizon conformal symmetry with a central charge. ...
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 ...
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; 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; 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 ...
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 ...
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; 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 ...
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 ...
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 ...