81 research outputs found
Self force on static charges in Schwarzschild spacetime
We study the self forces acting on static scalar and electric test charges in
the spacetime of a Schwarzschild black hole. The analysis is based on a direct,
local calculation of the self forces via mode decomposition, and on two
independent regularization procedures: A spatially-extended particle model
method, and on a mode-sum regularization prescription. In all cases we find
excellent agreement with the known exact results.Comment: 21 pages, 9 Encapsulated PostScript figures, submitted to Class.
Quantum Gra
Ultrafast voltage sampling using single-electron wavepackets
We demonstrate an ultrafast voltage sampling technique using a stream of electron wavepackets.
Electrons are emitted from a single-electron pump and travel through electron waveguides towards
a detector potential barrier. Our electrons sample an instantaneous voltage on the gate upon arrival
at the detector barrier. Fast sampling is achieved by minimising the duration that the electrons
interact with the barrier, which can be made as small as a few picoseconds. The value of the instan-
taneous voltage can be determined by varying the gate voltage to match the barrier height to the
electron energy, which is used as a stable reference. The test waveform can be reconstructed by
shifting the electron arrival time against it. Although we find that the our current system is limited
by the experimental line bandwidth to 12–18 GHz, we argue that this method has scope to increase
the bandwidth of voltage sampling to 100 GHz and beyond
The Federal Trade Commission and the Future Development of U.S. Consumer Protection Policy
Contracted Fracking: Using Community Contracts to Mitigate Local Impacts of Hydraulic Fracturing
A Market Approach to Regulating the Energy Revolution: Assurance Bonds, Insurance, and the Certain and Uncertain Risks of Hydraulic Fracturing
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