2,489 research outputs found
On the physical parametrization and magnetic analogs of the Emparan-Teo dihole solution
The Emparan-Teo non-extremal black dihole solution is reparametrized using
Komar quantities and the separation distance as arbitrary parameters. We show
how the potential can be calculated for the magnetic analogs of this
solution in the Einstein-Maxwell and Einstein-Maxwell-dilaton theories. We also
demonstrate that, similar to the extreme case, the external magnetic field can
remove the supporting strut in the non-extremal black dihole too.Comment: 9 pages, 1 figur
A note on static dyonic diholes
In this brief note we argue that a dyonic generalization of the Emparan-Teo
dihole solution is described by a static diagonal metric and therefore,
contrary to the claim made in a recent paper by Cabrera-Munguia et al., does
not involve any "non-vanishing global angular momentum" and rotating charges.Comment: 4 pages, 1 figure; typos corrected, matches the published versio
Schwarzschild black hole levitating in the hyperextreme Kerr field
The equilibrium configurations between a Schwarzschild black hole and a
hyperextreme Kerr object are shown to be described by a three-parameter
subfamily of the extended double-Kerr solution. For this subfamily, its Ernst
potential and corresponding metric functions, we provide a physical
representation which employs as arbitrary parameters the individual Komar
masses and relative coordinate distance between the sources. The calculation of
horizon's local angular velocity induced in the Schwarzschild black hole by the
Kerr constituent yields a simple expression inversely proportional to the
square of the distance parameter.Comment: 6 pages, 1 figure; improved versio
Fabrication of a focusing soft X-ray collector payload
A large area X-ray focusing collector with arc minute resolution and a position sensitive detector capable of operating in the soft X-ray region was developed for use on sounding rockets in studying stellar X-ray sources. The focusing payload consists of the following components, which are described: (1) a crossed paraboloid mirror assembly; (2) an aspect camera and star tracker; (3) a focal plane assembly containing an imaging proportional counter and its preamplifiers, high voltage power supplies and gas system; (4) a fiducial system; and (5) housekeeping, data handling, instrumentation and telemetry electronics. The design, tests, and operation are described
Classical gravitational spin-spin interaction
I obtain an exact, axially symmetric, stationary solution of Einstein's
equations for two massless spinning particles. The term representing the
spin-spin interaction agrees with recently published approximate work. The
spin-spin force appears to be proportional to the inverse fourth power of the
coordinate distance between the particles.Comment: six pages, no figures, journal ref:accepted for Classical and Quantum
Gravit
The Battle over Municipal Liability under CERCLA Heats Up: An Analysis of Proposed Congressional Amendments to Superfund
A continuation of a program of high angular resolution studies of celestial X-ray sources Final report, 19 Feb. - 1 Aug. 1968
Refurbishment and reflight of instrumented payload on Aerobee rocket for X ray astronomy progra
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