4,571 research outputs found
Dynamics of Gravity as Thermodynamics on the Spherical Holographic Screen
The dynamics of general Lovelock gravity, viewed on an arbitrary spherically
symmetric surface as a holographic screen, is recast as the form of some
generalized first law of thermodynamics on the screen. From this observation
together with other two distinct aspects, where exactly the same temperature
and entropy on the screen arise, it is argued that the thermodynamic
interpretation of gravity is physically meaningful not only on the horizon, but
also on a general spherically symmetric screen.Comment: 10 pages, revtex4; v2: minor corrections, references added? v3: the
summary paragraph replaced by the discussion of the general static case,
minor corrections/clarifications/modifications, references added, match the
published versio
Bulk Viscosity of dual Fluid at Finite Cutoff Surface via Gravity/Fluid correspondence in Einstein-Maxwell Gravity
Based on the previous paper arXiv:1207.5309, we investigate the possibility
to find out the bulk viscosity of dual fluid at the finite cutoff surface via
gravity/fluid correspondence in Einstein-Maxwell gravity. We find that if we
adopt new conditions to fix the undetermined parameters contained in the stress
tensor and charged current of the dual fluid, two new terms appear in the
stress tensor of the dual fluid. One new term is related to the bulk viscosity
term, while the other can be related to the perturbation of energy density. In
addition, since the parameters contained in the charged current are the same,
the charged current is not changed.Comment: 15 pages, no figure, typos corrected, new references and comments
added, version accepted by PL
From Petrov-Einstein-Dilaton-Axion to Navier-Stokes equation in anisotropic model
In this paper we generalize the previous works to the case that the
near-horizon dynamics of the Einstein-Dilaton-Axion theory can be governed by
the incompressible Navier-Stokes equation via imposing the Petrov-like boundary
condition on hypersurfaces in the non-relativistic and near-horizon limit. The
dynamical shear viscosity of such dual horizon fluid in our scenario,
which isotropically saturates the Kovtun-Son-Starinet (KSS) bound, is
independent of both the dilaton field and axion field in that limit.Comment: 13 pages,no figures; v2: 15 page, Equation.(33), some discussions and
references added, minor corrections , Version accepted for publication in
Physics Letters
Systematics of fusion probability in "hot" fusion reactions
The fusion probability in "hot" fusion reactions leading to the synthesis of
super-heavy nuclei is investigated systematically. The quasi-fission barrier
influences the formation of the super-heavy nucleus around the "island of
stability" in addition to the shell correction. Based on the quasi-fission
barrier height obtained with the Skyrme energy-density functional, we propose
an analytical expression for the description of the fusion probability, with
which the measured evaporation residual cross sections can be reproduced
acceptably well. Simultaneously, some special fusion reactions for synthesizing
new elements 119 and 120 are studied. The predicted evaporation residual cross
sections for 50Ti+249Bk are about 10-150fb at energies around the
entrance-channel Coulomb barrier. For the fusion reactions synthesizing element
120 with projectiles 54Cr and 58Fe, the cross sections fall to a few femtobarns
which seems beyond the limit of the available facilities.Comment: 5 figures, 1 tabl
Extremal Isolated Horizon/CFT Correspondence
The near-horizon limit of the extremal (weakly) isolated horizon is obtained
under the Bondi-like coordinates. For the vacuum case, explicit coordinate
transformation relating the near-horizon metric under the Bondi-like
coordinates and the standard Poincar\'e-type or global near-horizon metric of
the extremal Kerr black hole is found, which shows that the two geometries are
the same. Combined with the known thermodynamics of the (weakly) isolated
horizon, it is argued that the Kerr/CFT correspondence can be generalized to
the case of a large class of non-stationary extremal black holes.Comment: 13 pages, no figure, revtex4; v2: abstract revised, minor
corrections, references added; v3: minor corrections, version to appear in
PR
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