568,585 research outputs found
Reply on the ``Comment on `Loss-error compensation in quantum- state measurements' ''
The authors of the Comment [G. M. D'Ariano and C. Macchiavello to be
published in Phys. Rev. A, quant-ph/9701009] tried to reestablish a 0.5
efficiency bound for loss compensation in optical homodyne tomography. In our
reply we demonstrate that neither does such a rigorous bound exist nor is the
bound required for ruling out the state reconstruction of an individual system
[G. M. D'Ariano and H. P. Yuen, Phys. Rev. Lett. 76, 2832 (1996)].Comment: LaTex, 2 pages, 1 Figure; to be published in Physical Review
Single-phase heat transfer improved by helical inserts in tubes
Helical-vane insert creates a single, well defined helical flow passage resulting in more reliable predictions and extrapolations of the thermal and hydraulic performance. Insert core houses instrumentation which does not disturb the flow
Electronic transport properties of (fluorinated) metal phthalocyanine
The magnetic and transport properties of the metal phthalocyanine (MPc) and
FMPc (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn and Ag) families of
molecules in contact with S-Au wires are investigated by density functional
theory within the local density approximation, including local electronic
correlations on the central metal atom. The magnetic moments are found to be
considerably modified under fluorination. In addition, they do not depend
exclusively on the configuration of the outer electronic shell of the central
metal atom (as in isolated MPc and FMPc) but also on the interaction
with the leads. Good agreement between the calculated conductance and
experimental results is obtained. For M = Ag, a high spin filter efficiency and
conductance is observed, giving rise to a potentially high sensitivity for
chemical sensor applications.Comment: 8 pages (two-column), 8 figure
Modular Invariance on the Torus and Abelian Chern-Simons Theory
The implementation of modular invariance on the torus as a phase space at the
quantum level is discussed in a group-theoretical framework. Unlike the
classical case, at the quantum level some restrictions on the parameters of the
theory should be imposed to ensure modular invariance. Two cases must be
considered, depending on the cohomology class of the symplectic form on the
torus. If it is of integer cohomology class , then full modular invariance
is achieved at the quantum level only for those wave functions on the torus
which are periodic if is even, or antiperiodic if is odd. If the
symplectic form is of rational cohomology class , a similar result
holds --the wave functions must be either periodic or antiperiodic on a torus
times larger in both direccions, depending on the parity of .
Application of these results to the Abelian Chern-Simons is discussed.Comment: 24 pages, latex, no figures; title changed; last version published in
JM
Vector Mesons and Baryon Resonances in Nuclear Matter
We calculate the effect of many-body interactions in nuclear matter on the
spectral function of and meson. In particular, we focus on the
role played by baryon resonances in this context.Comment: 4 pages, 4 figures, to be published in proceedings of the Third
International Conference on Perspectives on Hadronic Physics, 7 - 11 May
2001, Miramare-Trieste, Ital
Smooth representations and sheaves
The paper is concerned with `geometrization' of smooth (i.e. with open
stabilizers) representations of the automorphism group of universal domains,
and with the properties of `geometric' representations of such groups. As an
application, we calculate the cohomology groups of several classes of smooth
representations of the automorphism group of an algebraically closed extension
of infinite transcendence degree of an algebraically closed field.Comment: 20 pages, final versio
Fuchsian groups of the second kind and representations carried by the limit set
We compute the cohomology of a Fuchsian group of the second kind with
coefficients in the hyperfunction vectors of the principal series
representations of supported on the limit set.Comment: 22 pages, LATE
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