Manuel Asorey | University of Zaragoza (original) (raw)

Manuel Asorey

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Papers by Manuel Asorey

We analyze the global theory of boundary conditions for a constrained quantum system with classic... more We analyze the global theory of boundary conditions for a constrained quantum system with classical configuration space a compact Riemannian manifold M with regular boundary Γ = ∂M . The space M of self-adjoint extensions of the covariant Laplacian on M is shown to have interesting geometrical and topological properties which are related to the different topological closures of M . In this sense, the change of topology of M is connected with the nontrivial structure of M. The space M itself can be identified with the unitary group U (L 2 (Γ, C N )) of the Hilbert space of boundary data L 2 (Γ, C N ). This description, is shown to be equivalent to the classical von Neumann's description in terms of deficiency index subspaces, but it is more efficient and explicit because it is given only in terms of the boundary data, which are the natural external inputs of the system. A particularly interesting family of boundary conditions, identified as the set of unitary operators which are singular under the Cayley transform, C − ∩ C + (the Cayley manifold), turns out to play a relevant role in topology change phenomena. The singularity of the Cayley transform implies that some energy levels, usually associated with edge states, acquire an infinity energy when by an adiabatic change the boundary conditions reaches the Cayley submanifold C − . In this sense topological transitions require an infinite amount of quantum energy to occur, although the description of the topological transition in the space M is smooth. This fact has relevant implications in string theory for possible scenarios with joint descriptions of open and closed strings. In the particular case of elliptic self-adjoint boundary conditions, the space C − can be identified with a Lagrangian submanifold of the infinite dimensional Grassmannian. The corresponding Cayley manifold C − is dual of the Maslov class of M. The phenomena are illustrated with some simple low dimensional examples.

Physical Review D, Jan 1, 1996

Physics Letters B, Jan 1, 1990

Nuclear Physics B, Jan 1, 1989

Nuclear Physics B, Jan 1, 2002

Journal of mathematical physics, Jan 1, 1983

Journal of Geometry and Physics, Jan 1, 1993

Physics Letters B, Jan 1, 1988

Volume 206, number 3 PHYSICS LETTERS B 26 May 1988 GEOMETRIC REGULARIZATION OF YANGMILLS THEORY M... more Volume 206, number 3 PHYSICS LETTERS B 26 May 1988 GEOMETRIC REGULARIZATION OF YANGMILLS THEORY Manuel ASOREY ' and Fernando FALCETO Departamento de Fisica Teorica, Facultad de Ciencias, Universidad de Zaragoza, E50009 Zaragoza, Spain ...