
Time-dependent perturbation
... and is not of our interest anymore. Taking out the uninteresting time dependence helps us to focus on questions such as the transitions from one H0 eigenstate to another due to the perturbation. By definition, H0 does not cause an eigenstate to transform to another, while the perturbation can. Just ...
... and is not of our interest anymore. Taking out the uninteresting time dependence helps us to focus on questions such as the transitions from one H0 eigenstate to another due to the perturbation. By definition, H0 does not cause an eigenstate to transform to another, while the perturbation can. Just ...
Lecture 22. Inductance. Magnetic Field Energy.
... The flux depends on the current, so a wire loop with a changing current induces an “additional” e.m.f. in itself that opposes the changes in the current and, thus, in the magnetic flux (sometimes called the back e.m.f.). ...
... The flux depends on the current, so a wire loop with a changing current induces an “additional” e.m.f. in itself that opposes the changes in the current and, thus, in the magnetic flux (sometimes called the back e.m.f.). ...
The Classical Electromagnetism of Particle Detection
... The general spherically symmetric solutions of this wave equation due to each dV1 must be of the form f ( R ct ) g ( R ct ) ...
... The general spherically symmetric solutions of this wave equation due to each dV1 must be of the form f ( R ct ) g ( R ct ) ...
A G2-QCD neutron star
... reach. The main reason for this is that it was not yet possible to derive the equation of state governing neutron stars from the fundamental theory, i. e. QCD, at finite density and small or zero temperature [4]. The reason is that lattice gauge theory, the mainstay of non-perturbative QCD calculati ...
... reach. The main reason for this is that it was not yet possible to derive the equation of state governing neutron stars from the fundamental theory, i. e. QCD, at finite density and small or zero temperature [4]. The reason is that lattice gauge theory, the mainstay of non-perturbative QCD calculati ...
The p orbital paradox
... Some physicists would say you that the problem was in the assumption of any trajectory linking initial and final points. Messiah even states we may renunciate to the concept of trajectories in quantum mechanics [Messiah, 1999]. I dislike that kind of reply by two motives. The first reason is methodo ...
... Some physicists would say you that the problem was in the assumption of any trajectory linking initial and final points. Messiah even states we may renunciate to the concept of trajectories in quantum mechanics [Messiah, 1999]. I dislike that kind of reply by two motives. The first reason is methodo ...
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.