9,603 research outputs found
Criticality in Gauged Supergravities
AdS black holes show richer transition behaviors in extended phase space by
assuming the cosmological constant and its conjugate quantity to behave like
thermodynamic pressure and thermodynamic volume. We study the extended
thermodynamics of charged dilatonic AdS black holes in a class of
Einstein-Maxwell-dilaton theories that can be embedded in gauged supergravities
in various dimensions. We find that the transition behaviors of higher
dimensional dilatonic AdS black holes are different from the four dimensional
counterparts, and new transition behaviors emerges in higher dimensions. First,
there exists standard Van der Waals transition only in a five dimensional
dilatonic AdS black hole with two equal charges. Second, there emerge a new
phase transition branch in negative pressure region in six and seven
dimensional dilatonic black holes with two equal charges. Third, there emerge
transition behaviors in higher dimensional black hole with single charge cases,
which are absent in four dimensions.Comment: Latex, 18 pages, 8 figures; published versio
Internal structure of hairy rotating black holes in three dimensions
We construct hairy rotating black hole solutions in three dimensional
Einstein gravity coupled to a complex scalar field. When we turn on a real and
uniform source on the dual CFT, the black hole is stationary with two Killing
vectors and we show that there is no inner horizon for the black hole and the
system evolves smoothly into a Kasner universe. When we turn on a complex and
periodic driving source on the dual CFT with a phase velocity equal to the
angular velocity of the black hole, we have a time-dependent black hole with
only one Killing vector. We show that inside the black hole, after a rapid
collapse of the Einstein-Rosen bridge, oscillations of the scalar field follow.
Then the system evolves into the Kasner epoch with possible Kasner inversion,
which occurs in most of the parameter regimes. In both cases, one of the metric
fields obeys a simple relation between its value at the horizon and in the
Kasner epoch.Comment: 35 pages, 14 figure
A new combination and a new synonym of Gesneriaceae in China
Didymocarpus subpalmatinervis W.T.Wang was shown to be conspecific with Petrocodon lithophilus Y.M.Shui, W.H.Chen & Mich.Möller, by checking original literature, examining specimens, tracing specimen collecting history, and conducting field surveys. The results show morphological characteristics and geographical distribution overlaps between these two species. The transfer of Didymocarpus subpalmatinervis to Petrocodon as a new combination with Petrocodon subpalmatinervis (W.T.Wang) F.Wen & Z.L.Li is proposed here, and P. lithophilus is synonymized with P. subpalmatinervis. Color photographs and essential information are also provided, including a detailed comparison of description, distribution, habitat, and the proposed IUCN conservation status
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