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Showing 2008 · math-phShow all
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math-ph2008★ 1 cited
On Spectral Gap,U(1) Symmetry and Split Property in Quantum Spin Chains
Taku Matsui
We consider a class of ground states for quantum spin chains on an integer lattice. First we show that presence of the spectral gap between the ground state energy and the rest of…
math-ph2008
Physical state for non-relativistic quantum electrodynamics
Fumio Hiroshima, Akito Suzuki
A physical subspace and physical Hilbert space associated with asymptotic fields of nonrelativistic quantum electrodynamics are constructed through the Gupta-Bleuler procedure. Asy…