111 research outputs found
WKB Propagation of Gaussian Wavepackets
We analyze the semiclassical evolution of Gaussian wavepackets in chaotic
systems. We prove that after some short time a Gaussian wavepacket becomes a
primitive WKB state. From then on, the state can be propagated using the
standard TDWKB scheme. Complex trajectories are not necessary to account for
the long-time propagation. The Wigner function of the evolving state develops
the structure of a classical filament plus quantum oscillations, with phase and
amplitude being determined by geometric properties of a classical manifold.Comment: 4 pages, 4 figures; significant improvement
Phase Space Structure of Generalized Gaussian Cat States
We analyze generalized Gaussian cat states obtained by superposing arbitrary
Gaussian states, e.g., a coherent state and a squeezed state. The Wigner
functions of such states exhibit the typical pair of Gaussian hills plus an
interference term which presents a novel structure, as compared with the
standard superposition of coherent states (degenerate case). We prove that, in
any dimensions, the structure of the interference term is characterized by a
particular quadratic form; in one degree of freedom the phase is hyperbolic.
This phase-space structure survives the action of a thermal reservoir. We also
discuss certain superpositions of {\em mixed} Gaussian states generated by
conditional Gaussian operations or Kerr-type dynamics on thermal states.Comment: 12 pages, 6 figures, submitted to Physical Review
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Phenomenology of the deuteron electromagnetic form factors
A rigorous extraction of the deuteron charge form factors from tensor polarization data in elastic electron-deuteron scattering, at given values of the 4-momentum transfer, is presented. Then the world data for elastic electron-deuteron scattering is used to parameterize, in three different ways, the three electromagnetic form factors of the deuteron in the 4-momentum transfer range 0-7 fm. This procedure is made possible with the advent of recent polarization measurements. The parameterizations allow a phenomenological characterization of the deuteron electromagnetic structure. They can be used to remove ambiguities in the form factors extraction from future polarization data
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Aus der Sammlung des Leo Baeck Institute, digitalisiert in Kooperation mit dem Center for Jewish History, N
Programmrede : gehalten von ... Raphael Breuer im Volksbildungsheim zu Frankfurt am Main am 17. Mai 1927, 15. Ijar 5687
[Raphael Breuer]Text teilw. in hebr. Schrift und Sprach
Nationaljudenthum ein Wahnjudenthum! : ein Wort zur Verständigung
von Raphael BreuerAus der Sammlung des Leo Baeck Institute, digitalisiert in Kooperation mit dem Center for Jewish History, N
Das Buch Josua
übers. und erläutert von Raphael BreuerText in hebr. Schr. und Sprache mit dt. Übers., dt. Komm
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