Hawking radiation in a dd-dimensional static spherically-symmetric black Hole surrounded by quintessence

We present a solution of Einstein equations with quintessential matter surrounding a $d$-dimensional black hole, whose asymptotic structures are determined by the state of the quintessential matter. We examine the thermodynamics of this black hole and find that the mass of the black hole depends on the equation of state of the quintessence, while the first law is universal. Investigating the Hawking radiation in this black hole background, we observe that the Hawking radiation dominates on the brane in the low-energy regime. For different asymptotic structures caused by the equation of state of the quintessential matter surrounding the black hole, we learn that the influences by the state parameter of the quintessence on Hawking radiation are different.Comment: 16 pages, Accepted for publication in Phys. Rev.

Scalar emission in a rotating G\"{o}del black hole

We study the absorption probability and Hawking radiation of the scalar field in the rotating G\"{o}del black hole in minimal five-dimensional gauged supergravity. We find that G\"{o}del parameter $j$ imprints in the greybody factor and Hawking radiation. It plays a different role from the angular momentum of the black hole in the Hawking radiation and super-radiance. These information can help us know more about rotating G\"{o}del black holes in minimal five-dimensional gauged supergravity.Comment: 14 pages, 4 figures, This version accepted for publication in Phys. Rev. D contains a minor modification and two new reference

Retraction and Generalized Extension of Computing with Words

Fuzzy automata, whose input alphabet is a set of numbers or symbols, are a formal model of computing with values. Motivated by Zadeh's paradigm of computing with words rather than numbers, Ying proposed a kind of fuzzy automata, whose input alphabet consists of all fuzzy subsets of a set of symbols, as a formal model of computing with all words. In this paper, we introduce a somewhat general formal model of computing with (some special) words. The new features of the model are that the input alphabet only comprises some (not necessarily all) fuzzy subsets of a set of symbols and the fuzzy transition function can be specified arbitrarily. By employing the methodology of fuzzy control, we establish a retraction principle from computing with words to computing with values for handling crisp inputs and a generalized extension principle from computing with words to computing with all words for handling fuzzy inputs. These principles show that computing with values and computing with all words can be respectively implemented by computing with words. Some algebraic properties of retractions and generalized extensions are addressed as well.Comment: 13 double column pages; 3 figures; to be published in the IEEE Transactions on Fuzzy System

Insight into the liquid state of organo-lead halide perovskites and their new roles in dye-sensitized solar cells

Here we report that organo-lead halide perovskite CH3NH 3PbI(3-x)Clx solution can be used as a new liquid electrolyte in dye-sensitized solar cells (DSCs). We find that the presence of inorganic octahedra of [PbX6]4- (X = I or Cl, or a combination of them) in this perovskite solution can not only remarkably improve the device stability but also enhance the photo-response of DSCs