1,904,592 research outputs found
Monopoles and Solitons in Fuzzy Physics
Monopoles and solitons have important topological aspects like quantized
fluxes, winding numbers and curved target spaces. Naive discretizations which
substitute a lattice of points for the underlying manifolds are incapable of
retaining these features in a precise way. We study these problems of discrete
physics and matrix models and discuss mathematically coherent discretizations
of monopoles and solitons using fuzzy physics and noncommutative geometry. A
fuzzy sigma-model action for the two-sphere fulfilling a fuzzy Belavin-Polyakov
bound is also put forth.Comment: 17 pages, Latex. Uses amstex, amssymb.Spelling of the name of one
Author corrected. To appear in Commun.Math.Phy
Description of Nuclear Structure Effects in Subbarrier Fusion by the Interacting Boson Model
Recent theoretical developments in using the Interacting Boson Model to
describe nuclear structure effects in fusion reactions below the Coulomb
barrier are reviewed. Methods dealing with linear and all orders coupling
between the nuclear excitations and the translational motion are discussed, and
the latter is found to lead to a better description of the barrier distribution
data. A systematic study of the available data (cross sections, barrier and
spin distributions) in rare-earth nuclei is presented.Comment: 9 pages + 2 Figures (in eps form). To be published in the Proceedings
of the FUSION97 Conference, South Durras, Australia, March 1997 (J. Phys. G).
Full text and figures are also available at
http://nucth.physics.wisc.edu/preprints/mad-nt-97-01.abs.htm
Comment on "Mass and K Lambda coupling of N*(1535)"
It is argued in [1] that when the strong coupling to the K Lambda channel is
considered, Breit-Wigner mass of the lightest orbital excitation of the nucleon
N(1535) shifts to a lower value. The new value turned out to be smaller than
the mass of the lightest radial excitation N(1440), which effectively solved
the long-standing problem of conventional constituent quark models. In this
Comment we show that it is not the Breit-Wigner mass of N(1535) that is
decreased, but its bare mass.
[1] B. C. Liu and B. S. Zou, Phys. Rev. Lett. 96, 042002 (2006).Comment: 3 pages, comment on "Mass and K Lambda coupling of N*(1535)", B. C.
Liu and B. S. Zou, Phys. Rev. Lett. 96, 042002 (2006
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