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6 papers · 1 filter
Momentum in stochastic quantum mechanics
Mark P. Davidson
Momentum is analyzed as a random variable in stochastic quantum mechanics. Arbitrary potential energy functions are considered. The oscillator is presented as an example.
Stochastic quantization of the linearized gravitational field
Mark P. Davidson
Stochastic field equations for linearized gravity are presented. The theory is compared with the usual quantum field theory and questions of Lorentz covariance are discussed. The c…
How much state assignments can differ
Todd A. Brun, J. Finkelstein, N. David Mermin
We derive necessary and sufficient conditions for a group of density matrices to characterize what different people may know about one and the same physical system.
Far Infrared Spectroscopy of Normal Galaxies: Physical Conditions in the Interstellar Medium
S. Malhotra, M. J. Kaufman, D. Hollenbach +8
The most important cooling lines of the neutral interstellar medium (ISM) lie in the far-infrared (FIR). We present measurements by the Infrared Space Observatory Long Wavelength S…
Counting, Fanout, and the Complexity of Quantum ACC
Frederic Green, Steven Homer, Cristopher Moore +1
We propose definitions of $\QAC^0$, the quantum analog of the classical class $\AC^0$ of constant-depth circuits with AND and OR gates of arbitrary fan-in, and $\QACC[q]$, the anal…
A strong Schottky Lemma for nonpositively curved singular spaces
Roger C. Alperin, Benson Farb, Guennadi A. Noskov
In this paper we give a criterion for pairs of isometries of a nonpositively curved metric space to generate a free group. This criterion holds only in singular spaces, for example…