The ideas which led Erwin Schrgdinger to his discovery of wave mechanics are exposed in this pape... more The ideas which led Erwin Schrgdinger to his discovery of wave mechanics are exposed in this paper in a pedagogical manner. We hope that: the material presented may be usefully employed in introduc tory courses of quantum mechanics, which are usual ly offered in the last year of the undergraduate curriculum. Apresentamos neste artigo, de uma manei ra d idatica, as ideias que levaram Erwin Schrgdinger a descoberta da mecânica mdulatoria. Esperamos que o presente trabalho possa ser utilizado em cursos deintro ducao a mecânica quântica, que usualmente sao dados no quarto ano de bacharelado em Fisica.
Lecture notes on path-integrals, suitable for an undergraduate course with prerequisites such as:... more Lecture notes on path-integrals, suitable for an undergraduate course with prerequisites such as: Classical Mechanics, Electromagnetism and Quantum Mechanics. The aim is to provide the reader, who is familiar with the major concepts of Solid State Physics, to study these topics couched in the language of path integrals. We endeavor to keep the formalism to the bare minimum.
The authors show that the Ashkin-Teller model has Ising critical exponents, in the region where t... more The authors show that the Ashkin-Teller model has Ising critical exponents, in the region where the model has two phase transitions. The proof follows from mapping the ground state of the time-continuous Ashkin-Teller Hamiltonian onto that of the Ising chain in a transverse field.
We propose an exact, factorized, S matrix for the two-dimensional supersymmetric CP/sup N/â»Â¹ m... more We propose an exact, factorized, S matrix for the two-dimensional supersymmetric CP/sup N/â»Â¹ model, which is compatible with the 1/N expansion. We find that antiparticles are bound states of N-1 particles.
Using the equivalence with a derivative-coupling model, mass perturbation in the Thirring model i... more Using the equivalence with a derivative-coupling model, mass perturbation in the Thirring model is investigated. We show that, for 4~(2-fl31 </32 < 8?r all ultraviolet divergences cancel. Finite composite operators are constructed in this range. Ward identities and equations of motion are discussed.
In the case of nucleon Compton scattering, theory and experiment disagree at the photoproduction ... more In the case of nucleon Compton scattering, theory and experiment disagree at the photoproduction threshold and at the peak of the first pion-nucleon resonance (1236 MeV) at 90° cm scattering angle. Dispersion relations are used to calculate the scattering amplitudes of this process ...
The ideas which led Erwin Schrgdinger to his discovery of wave mechanics are exposed in this pape... more The ideas which led Erwin Schrgdinger to his discovery of wave mechanics are exposed in this paper in a pedagogical manner. We hope that: the material presented may be usefully employed in introduc tory courses of quantum mechanics, which are usual ly offered in the last year of the undergraduate curriculum. Apresentamos neste artigo, de uma manei ra d idatica, as ideias que levaram Erwin Schrgdinger a descoberta da mecânica mdulatoria. Esperamos que o presente trabalho possa ser utilizado em cursos deintro ducao a mecânica quântica, que usualmente sao dados no quarto ano de bacharelado em Fisica.
Lecture notes on path-integrals, suitable for an undergraduate course with prerequisites such as:... more Lecture notes on path-integrals, suitable for an undergraduate course with prerequisites such as: Classical Mechanics, Electromagnetism and Quantum Mechanics. The aim is to provide the reader, who is familiar with the major concepts of Solid State Physics, to study these topics couched in the language of path integrals. We endeavor to keep the formalism to the bare minimum.
The authors show that the Ashkin-Teller model has Ising critical exponents, in the region where t... more The authors show that the Ashkin-Teller model has Ising critical exponents, in the region where the model has two phase transitions. The proof follows from mapping the ground state of the time-continuous Ashkin-Teller Hamiltonian onto that of the Ising chain in a transverse field.
We propose an exact, factorized, S matrix for the two-dimensional supersymmetric CP/sup N/â»Â¹ m... more We propose an exact, factorized, S matrix for the two-dimensional supersymmetric CP/sup N/â»Â¹ model, which is compatible with the 1/N expansion. We find that antiparticles are bound states of N-1 particles.
Using the equivalence with a derivative-coupling model, mass perturbation in the Thirring model i... more Using the equivalence with a derivative-coupling model, mass perturbation in the Thirring model is investigated. We show that, for 4~(2-fl31 </32 < 8?r all ultraviolet divergences cancel. Finite composite operators are constructed in this range. Ward identities and equations of motion are discussed.
In the case of nucleon Compton scattering, theory and experiment disagree at the photoproduction ... more In the case of nucleon Compton scattering, theory and experiment disagree at the photoproduction threshold and at the peak of the first pion-nucleon resonance (1236 MeV) at 90° cm scattering angle. Dispersion relations are used to calculate the scattering amplitudes of this process ...
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Papers by Roland Köberle