Effective Field Theories, Reductionism and Scientific Explanation Stephan Hartmann
... are considerable mathematical difficulties which show up when calculating the transition amplitude. These difficulties even show up when Feynman diagrams are used explicitly. 7 For the details of the calculation we now follow the modern reconstruction given by Itzykson and Zuber (1980, pp. 195f). This w ...
... are considerable mathematical difficulties which show up when calculating the transition amplitude. These difficulties even show up when Feynman diagrams are used explicitly. 7 For the details of the calculation we now follow the modern reconstruction given by Itzykson and Zuber (1980, pp. 195f). This w ...
... systems have been reported in GaAs − Ga1−x Alx As quantumwell wires (QWWs) and quantum dots (QDs) [4–6]. The effects of hydrostatic pressure on such systems, and in particular on the photoionization (PI) cross-section, show that the PI depends strongly on the symmetry of the potential that confines ...
Entanglement, Distillation and Quantum Repeaters
... [2] W. Dür, H.-J. Briegel, J. I. Cirac, and P. Zoller. Quantum repeaters based on entanglement purification. Phys. Rev. A, 59:169, 1999. [3] M. M. Wolf, J. Eisert, G. Giedke, J. I. Cirac, M. Lewenstein, M. B. Plenio, and R. F. Werner. Gaussian states and operations (textbook in preparation). ...
... [2] W. Dür, H.-J. Briegel, J. I. Cirac, and P. Zoller. Quantum repeaters based on entanglement purification. Phys. Rev. A, 59:169, 1999. [3] M. M. Wolf, J. Eisert, G. Giedke, J. I. Cirac, M. Lewenstein, M. B. Plenio, and R. F. Werner. Gaussian states and operations (textbook in preparation). ...
PPT
... Our Radiometer Black side is hotter: gas molecules bounce off it with more momentum than on shiny side-this is a bigger effect than the photon momentum ...
... Our Radiometer Black side is hotter: gas molecules bounce off it with more momentum than on shiny side-this is a bigger effect than the photon momentum ...
Renormalization
In quantum field theory, the statistical mechanics of fields, and the theory of self-similar geometric structures, renormalization is any of a collection of techniques used to treat infinities arising in calculated quantities.Renormalization specifies relationships between parameters in the theory when the parameters describing large distance scales differ from the parameters describing small distances. Physically, the pileup of contributions from an infinity of scales involved in a problem may then result in infinities. When describing space and time as a continuum, certain statistical and quantum mechanical constructions are ill defined. To define them, this continuum limit, the removal of the ""construction scaffolding"" of lattices at various scales, has to be taken carefully, as detailed below.Renormalization was first developed in quantum electrodynamics (QED) to make sense of infinite integrals in perturbation theory. Initially viewed as a suspect provisional procedure even by some of its originators, renormalization eventually was embraced as an important and self-consistent actual mechanism of scale physics in several fields of physics and mathematics. Today, the point of view has shifted: on the basis of the breakthrough renormalization group insights of Kenneth Wilson, the focus is on variation of physical quantities across contiguous scales, while distant scales are related to each other through ""effective"" descriptions. All scales are linked in a broadly systematic way, and the actual physics pertinent to each is extracted with the suitable specific computational techniques appropriate for each.