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4 papers · 1 filter
Wavefronts, Caustic Sheets, and Caustic Surfing in Gravitational Lensing
S. Frittelli, A. O. Petters
Very little attention has been paid to the properties of optical wavefronts and caustic surfaces due to gravitational lensing. Yet the wavefront-based point of view is natural and…
Dynamics of Fermat potentials in non-perturbative gravitational lensing
Simonetta Frittelli, Ezra T. Newman
We present a framework, based on the null-surface formulation of general relativity, for discussing the dynamics of Fermat potentials for gravitational lensing in a generic situati…
Fermat Potentials for Non-Perturbative Gravitational Lensing
Simonetta Frittelli, Thomas P. Kling, Ezra T. Newman
The images of many distant galaxies are displaced, distorted and often multiplied by the presence of foreground massive galaxies near the line of sight; the foreground galaxies act…
Quantum DNF Learnability Revisited
Jeffrey C. Jackson, Christino Tamon, Tomoyuki Yamakami
We describe a quantum PAC learning algorithm for DNF formulae under the uniform distribution with a query complexity of , where is the size of…