The death of electric current
... "By the way, is there such a thing as an electric current? Not that it is intended to cast any doubt upon the existence of a phenomenon so called; but is it a current - that is, something moving through a wire? Now, although nothing but very careful inculation at a tender age, CODtinued unremittingl ...
... "By the way, is there such a thing as an electric current? Not that it is intended to cast any doubt upon the existence of a phenomenon so called; but is it a current - that is, something moving through a wire? Now, although nothing but very careful inculation at a tender age, CODtinued unremittingl ...
Elementary Particles: A Brief History
... set of quantum properties, such as the electric charge, to the matter we know in the everyday world. Thus a positron has the same mass as that of an electron, but opposite charge. When they interact, they annihilate each other completely and are converted into pure energy as a pair of energetic phot ...
... set of quantum properties, such as the electric charge, to the matter we know in the everyday world. Thus a positron has the same mass as that of an electron, but opposite charge. When they interact, they annihilate each other completely and are converted into pure energy as a pair of energetic phot ...
Is the Zero-Point Energy Real? - General Guide To Personal and
... This quantity is just the sum of the zero-point energy over the normal modes of the field up to the cut-off Λ. If this is set at the Planck mass, Λ ∼ mP lanck ∼ 1019 GeV , then given the current upper bound on the cosmological constant λ < 10−29 g/cm3 ∼ (10−11 GeV )4 , the observed value is more tha ...
... This quantity is just the sum of the zero-point energy over the normal modes of the field up to the cut-off Λ. If this is set at the Planck mass, Λ ∼ mP lanck ∼ 1019 GeV , then given the current upper bound on the cosmological constant λ < 10−29 g/cm3 ∼ (10−11 GeV )4 , the observed value is more tha ...
The British Journal for the Philosophy of Science
... physics is not presented as the investigation of what Bacon called nature Hbera (such as it is without our intervention) through the natura vexata (such as it becomes when we subject it to our cognitive actions) —but as the examination of appearances, the latter being conceived (as we shall see) as ...
... physics is not presented as the investigation of what Bacon called nature Hbera (such as it is without our intervention) through the natura vexata (such as it becomes when we subject it to our cognitive actions) —but as the examination of appearances, the latter being conceived (as we shall see) as ...
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.