From the 1 of 4 linked papers with an AI index.
4 papers
The quantum mechanics of experiments
Jürg Fröhlich, Alessandro Pizzo
The paper reviews the quantum measurement problem and argues that dissipative, stochastic evolution of individual quantum states—arising from ensemble averages of matter interactin…
Chern-Simons theory in mathematics, condensed matter theory and cosmology
Jürg Fröhlich
Various applications of Chern-Simons theory in algebraic topology, in particular knot theory, condensed matter physics and cosmology are reviewed. Special attention is paid to appe…
Low energy spectrum of the XXZ model coupled to a magnetic field
Simone Del Vecchio, Jürg Fröhlich, Alessandro Pizzo +1
For a class of Hamiltonians of spin chains in a uniform external magnetic field that are small quantum perturbations of an Ising Hamiltonian, it is shown that the spectral ga…
Boundary effects and the stability of the low energy spectrum of the AKLT model
Simone Del Vecchio, Jürg Fröhlich, Alessandro Pizzo +1
In this paper we study the low-lying spectrum of the AKLT model perturbed by small, finite-range potentials and with open boundary conditions imposed at the edges of the chain. Our…