2,483 research outputs found
Note on Thermodynamics Method of Black Hole/CFT Correspondence
In the paper we further refine the thermodynamics method of black hole/CFT
correspondence. We show that one can derive the central charges of different
holographic pictures directly from the entropy product if it is
mass-independent, for a black hole in the Einstein gravity or the gravity
without diffeomorphism anomaly. For a general black hole in the Einstein
gravity that admits holographic descriptions, we show that the thermodynamics
method and asymptotic symmetry group (ASG) analysis can always give consistent
results in the extreme limit. Furthermore, we discuss the relation between
black hole thermodynamics and the hidden conformal symmetry. We show that the
condition , with being the outer and inner horizon
areas, is the necessary, but not sufficient, condition for a black hole to have
the hidden conformal symmetry. In particular, for the Einstein(-Maxwell)
gravity is just the condition , with
being the outer and inner horizon entropies, which is the condition for the
entropy product being mass-dependent. When there exists the hidden
conformal symmetry in the low-frequency scattering off the generic non-extremal
black hole, it always leads to the same temperatures of dual CFT as the ones
got from the thermodynamics method.Comment: 31 pages, references added, published versio
The Regional Variation of Ontario Works: From the Perspective of Provincial-Municipal Relationship
This paper examines the regional variations of Ontario Works in the province using empirical studies of 12 municipalities: Durham, Halton, Hamilton, London, Muskoka, Niagara, Ottawa, Sudbury, Toronto, Waterloo, Windsor, and York. The findings reveal that the variation of Ontario Works in different municipalities is limited and the services provided to clients are similar across the entire province. Furthermore, in understanding why the provincial government still requires the involvement of municipalities in the program, despite it being consistent across Ontario, it concludes that the introduction of Ontario Works was accompanied by the province’s decentralization process and the fiscal retrenchment of provincial government in Ontario Works requires municipalities to have some autonomy
Self-Trapping of Bose-Einstein Condensates in an Optical Lattice: the Effect of the System Dimension
In the present paper, we investigate the dynamics of a Bose-Einstein
condensates (BEC) loaded into an deep optical lattice of 1D, 2D and 3D, both
analytically and numerically. We focus on the self-trapping state and the
effect of the system dimension. Under the tight-binding approximation we obtain
an analytical criterion for the self-trapping state of BEC using time-dependent
variational method. The phase diagram for self-trapping, soliton, breather, or
diffusion of the BEC cloud is obtained accordingly and verified by directly
solving the discrete Gross-Pitaevskii equation (GPE) numerically. In
particular, we find that the criterion and the phase diagrams are modified
dramatically by the dimension of the lattices.Comment: 8pages, 9 figure
The vertical composition of neutrino-dominated accretion disks in gamma-ray bursts
We investigate the vertical structure and elements distribution of
neutrino-dominated accretion flows around black holes in spherical coordinates
with the reasonable nuclear statistical equilibrium. According our
calculations, heavy nuclei tend to be produced in a thin region near the disk
surface, whose mass fractions are primarily determined by the accretion rate
and the vertical distribution of temperature and density. In this thin region,
we find that is dominant for the flow with low accretion rate
(e.g., ) but is dominant for the
high counterpart (e.g., ). The dominant
in the special region may provide a clue to understand the bumps in the optical
light curve of core-collapse supernovae.Comment: 15 pages, 2 figures, accepted for publication in Ap
6-Bromopyridine-2-carboxamide
In the the title compound, C6H5BrN2O, an intramolecular N—H⋯N hydrogen bond generates an S(5) ring. In the crystal structure, intermolecular bifurcated N—H⋯(O,O) hydrogen bonds link the molecules, leading to sheets propagating in (100)
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