We investigate the connection between the BTZ black holes and the near-horizon geometry of higher-dimensional black holes. Under mild conditions, we show that (i) if a black hole has a global structure of the Reissner-Nordstrom black hole type, its near-horizon geometry is AdS2 times a sphere, and further (ii) if such a black hole is obtained from a boosted black string by dimensional reduction...

We explore the physical consequences of a recently discovered class of exact solutions to five dimensional Kaluza-Klein theory. We find a number of surprising features including: (1) In the presence of a Kaluza-Klein bubble, there are arbitrarily large black holes with topology S. (2) In the presence of a black hole or a black string, there are expanding bubbles (with de Sitter geometry) which ...

Matrix theory [1] appears to capture a remarkable amount of the nonperturbative structure of string/M-theory. At generic values of the moduli, most of the localized states of the latter are black holes. One would like to see how matrix theory encodes their basic properties { geometry, dynamics of test particles, thermodynamics, decay via the Hawking process, etc. First steps in this direction h...

We show that a class of four-dimensional rotating black holes allow fivedimensional embeddings as black rotating strings. Their near-horizon geometry factorizes locally as a product of the three-dimensional anti-deSitter spacetime and a two-dimensional sphere (AdS3 × S2), with angular momentum encoded in the global space-time structure. Following the observation that the isometries on the AdS3 ...

We review the classical thermodynamics and the greybody factors of general (rotating) non-extreme black holes and discuss universal features of their near-horizon geometry. We motivate a microscopic interpretation of general black holes that relates the thermodynamics of an effective string theory to the geometry of the black hole in the vicinity of both the outer and the inner event horizons. ...

feature geometry, which is a basic assumption in current phonology, is concerned with the notion that the features are not an unstructured set, but are arranged hierarchically into a constituent structure tree. according to evidences in different languages, various models have been set forth on feature geometry framework. exploring persian phonological data and digging up evidences accordingly,...

a new method for determination of residual stresses in the bottom layers of laminated composites is developed. in this method the residual stresses are determined by performing a consecutive drilling of laminated composites in the center of the rosette and recording the strains after drilling each layer. the depth of the hole in each step is equal to the thickness of each layer and the maximum ...

Abstract: We first calculate the heat capacities of the nonlinear electrodynamics (NED) black hole for fixed mass and electric charge, and the electric capacitances for fixed mass and entropy. Then, we study the properties of the Ruppeiner thermodynamic geometry of the NED black hole. Lastly, some discussions on the thermal stability of the NED black hole and the implication to the flatness of ...