58,388 research outputs found
A variational principle for actions on symmetric symplectic spaces
We present a definition of generating functions of canonical relations, which
are real functions on symmetric symplectic spaces, discussing some conditions
for the presence of caustics. We show how the actions compose by a neat
geometrical formula and are connected to the hamiltonians via a geometrically
simple variational principle which determines the classical trajectories,
discussing the temporal evolution of such ``extended hamiltonians'' in terms of
Hamilton-Jacobi-type equations. Simplest spaces are treated explicitly.Comment: 28 pages. Edited english translation of first author's PhD thesis
(2000
Hadronic molecules: meson-baryon hybrids
The existence of hadronic molecular-type hybrids consisting of a baryon and a
meson is argued. Long-range interactions due to one-pion exchange is shown to
be strong enough to produce a loosely bound state. Specific features of a
molecular hybrid are discussed.Comment: 7 pages in RevTeX plus 1 figure (available upon request
Massive Degeneracy and Goldstone Bosons: A Challenge for the Light Cone
Wherein it is argued that the light front formalism has problems dealing with
Goldstone symmetries. It is further argued that the notion that in hadron
condensates can explain Goldstone phenomena is false.Comment: 7 pages, 5 figures, Invited Talk at Light Cone 2010, Valencia Spai
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