1,357 research outputs found
Topology Change of Coalescing Black Holes on Eguchi-Hanson Space
We construct multi-black hole solutions in the five-dimensional
Einstein-Maxwell theory with a positive cosmological constant on the
Eguchi-Hanson space, which is an asymptotically locally Euclidean space. The
solutions describe the physical process such that two black holes with the
topology of S^3 coalesce into a single black hole with the topology of the lens
space L(2;1)=S^3/Z_2. We discuss how the area of the single black hole after
the coalescence depends on the topology of the horizon.Comment: 10 pages, Some comments are added. to be published as a letter in
Classical and Quantum Gravit
Charged Rotating Kaluza-Klein Black Holes Generated by G2(2) Transformation
Applying the G_{2(2)} generating technique for minimal D=5 supergravity to
the Rasheed black hole solution, we present a new rotating charged Kaluza-Klein
black hole solution to the five-dimensional Einstein-Maxwell-Chern-Simons
equations. At infinity, our solution behaves as a four-dimensional flat
spacetime with a compact extra dimension and hence describes a Kaluza-Klein
black hole. In particlar, the extreme solution is non-supersymmetric, which is
contrast to a static case. Our solution has the limits to the asymptotically
flat charged rotating black hole solution and a new charged rotating black
string solution.Comment: 24 page
Nonlinear resonance interaction of ultrasonic waves under applied stress
Copyright 1984 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics, 56(1), 235-237, 1984 and may be found at http://dx.doi.org/10.1063/1.33375
Vacuum solutions of five dimensional Einstein equations generated by inverse scattering method
We study stationary and axially symmetric two solitonic solutions of five
dimensional vacuum Einstein equations by using the inverse scattering method
developed by Belinski and Zakharov. In this generation of the solutions, we use
five dimensional Minkowski spacetime as a seed. It is shown that if we restrict
ourselves to the case of one angular momentum component, the generated solution
coincides with a black ring solution with a rotating two sphere which was found
by Mishima and Iguchi recently.Comment: 10 pages, accepted for publication in Physical Review
Relationship Between Solitonic Solutions of Five-Dimensional Einstein Equations
We give the relation between the solutions generated by the inverse
scattering method and the B\"acklund transformation applied to the vacuum
five-dimensional Einstein equations. In particular, we show that the
two-solitonic solutions generated from an arbitrary diagonal seed by the
B\"acklund transformation are contained within those generated from the same
seed by the inverse scattering method.Comment: 17 pages, Some references are added, to be published in Phys.Rev.
Boundary Value Problem for Black Rings
We study the boundary value problem for asymptotically flat stationary black
ring solutions to the five-dimensional vacuum Einstein equations. Assuming the
existence of two additional commuting axial Killing vector fields and the
horizon topology of , we show that the only asymptotically flat
black ring solution with a regular horizon is the Pomeransky-Sen'kov black ring
solution.Comment: 21 pages, 1 figur
Uniqueness and nonuniqueness of the stationary black holes in 5D Einstein-Maxwell and Einstein-Maxwell-dilaton gravity
In the present paper we investigate the general problem of uniqueness of the
stationary black solutions in 5D Einstein-Maxwell-dilaton gravity with
arbitrary dilaton coupling parameter containing the Einstein-Maxwell gravity as
a particular case. We formulate and prove uniqueness theorems classifying the
stationary black hole solutions in terms of their interval structure, electric
and magnetic charges and the magnetic fluxes. The proofs are based on the
nonpositivity of the Riemann curvature operator on the space of the potentials
which imposes restrictions on the dilaton coupling parameter.Comment: 21 pages, LaTe
Hole spin relaxation in [001] strained asymmetric Si/SiGe and Ge/SiGe quantum wells
Hole spin relaxation in [001] strained asymmetric Si/SiGe
(Ge/SiGe) quantum wells is investigated in the situation with
only the lowest hole subband being relevant. The effective Hamiltonian of the
lowest hole subband is obtained by the subband L\"owdin perturbation method in
the framework of the six-band Luttinger model, with
sufficient basis functions included. The lowest hole subband in Si/SiGe quantum
wells is light-hole like with the Rashba spin-orbit coupling term depending on
momentum both linearly and cubically, while that in Ge/SiGe quantum wells is a
heavy hole state with the Rashba spin-orbit coupling term depending on momentum
only cubically. The hole spin relaxation is investigated by means of the fully
microscopic kinetic spin Bloch equation approach, with all the relevant
scatterings considered. It is found that the hole-phonon scattering is very
weak, which makes the hole-hole Coulomb scattering become very important. The
hole system in Si/SiGe quantum wells is generally in the strong scattering
limit, while that in Ge/SiGe quantum wells can be in either the strong or the
weak scattering limit. The Coulomb scattering leads to a peak in both the
temperature and hole density dependences of spin relaxation time in Si/SiGe
quantum wells, located around the crossover between the degenerate and
nondegenerate regimes. Nevertheless, the Coulomb scattering leads to not only a
peak but also a valley in the temperature dependence of spin relaxation time in
Ge/SiGe quantum wells.... (The remaining is omitted due to the limit of space).Comment: 12 pages, 11 figures, PRB in pres
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