155 research outputs found
Equivalent Hamiltonians
I give a characterization of the conditions for two Hamiltonians to be
equivalent, discuss the construction of the operators that relate equivalent
Hamiltonians, and introduce variational methods that can select Hamiltonians
with desirable features from the space of equivalent Hamiltonians.Comment: 15 page
The light-front vacuum and dynamics
I give a quantum theoretical description of kinematically invariant vacuua on
the algebra of free fields restricted to a light front and discuss the relation
between the light-front Hamiltonian, P-, the vacuum, and Poincare invariance.
This provides a quantum theoretical description of zero modes.Comment: 5 pages, Talk at Light-Cone 200
A Theorem on Light-Front Quantum Models
I give a sufficient condition for a relativistic front-form quantum
mechanical model to be scattering equivalent (unitarily equivalent with the
same S-matrix elements) to a relativistic front-form quantum model with an
interaction-independent front-form spin.Comment: 22 pages, (TeX + PHYZZX macros
Relativistic Quantum Dynamics of Many-Body Systems
Relativistic quantum dynamics requires a unitary representation of the
Poincare group on the Hilbert space of states. The dynamics of many-body
systems must satisfy cluster separability requirements. In this paper we
formulate an abstract framework of four dimensional Euclidean Green functions
that can be used to construct relativistic quantum dynamics of N-particle
systems consistent with these requirements. This approach should be useful in
bridging the gap between few-body dynamics based on phenomenological mass
operators and on quantum field theory.Comment: Latex, 9 Pages, Submitted to World Scientific - 50 Years of Quantum
Many-Body Theory - A Conference in Honor of the 65-th Birthdays of John W.
Clark, Alpo J. Kallio, Manfred L. Ristig, and Sergio Rosat
Wavelets in Field Theory
We advocate the use of Daubechies wavelets as a basis for treating a variety
of problems in quantum field theory. This basis has both natural large volume
and short distance cutoffs, has natural partitions of unity, and the basis
functions are all related to the fixed point of a linear renormalization group
equation.Comment: 42 pages, 2 figures, corrected typo
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