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Alt 26.09.18, 23:54
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Zitat:
Zitat von Hawkwind Beitrag anzeigen
Hawking selbst sah das wohl nicht so eng wie du ...
Das weiß ich. Bereits in seiner Originalarbeit steht sowas drin.

Aber - https://en.m.wikipedia.org/wiki/Virtual_particle

Zitat:
The concept of virtual particles arises in perturbation theory of quantum field theory where interactions between ordinary particles are described in terms of exchanges of virtual particles. Any process involving virtual particles admits a schematic representation known as a Feynman diagram, in which virtual particles are represented by internal lines.[1][2]

The concept of virtual particles arises in the perturbation theory of quantum field theory, an approximation scheme in which interactions between actual particles are calculated in terms of exchanges of virtual particles. Such calculations are often performed using schematic representations known as Feynman diagrams, in which virtual particles appear as internal lines. By expressing the interaction in terms of the exchange of a virtual particle ...[3]

A virtual particle does not precisely obey the energy–momentum relation ... [4]. This is expressed by the phrase off mass shell.[3]. The probability amplitude for a virtual particle to exist tends to be canceled out by destructive interference over longer distances and times. As a consequence, a real photon is massless and thus has only two polarization states, whereas a virtual one, being effectively massive, has three polarization states.

In the quantum field theory view, actual particles are viewed as being detectable excitations of underlying quantum fields. Virtual particles are also viewed as excitations of the underlying fields, but appear only as forces, not as detectable particles.

Thus, in mathematical terms, they never appear as indices to the scattering matrix, which is to say, they never appear as the observable inputs and outputs of the physical process being modelled.

[1] Peskin, M.E., Schroeder, D.V. (1995). An Introduction to Quantum Field Theory, Westview Press, ISBN 0-201-50397-2, p. 80.
[2] Mandl, F., Shaw, G. (1984/2002). Quantum Field Theory, John Wiley & Sons, Chichester UK, revised edition, ISBN 0-471-94186-7, pp. 56, 176.
[3] Cambridge, Mark Thomson, University of (2013). Modern particle physics. Cambridge: Cambridge University Press. ISBN 978-1107034266.
[4] Hawking, Stephen (1998). A brief history of time (Updated and expanded tenth anniversary ed.). New York: Bantam Books. ISBN 9780553896923.
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Niels Bohr brainwashed a whole generation of theorists into thinking that the job (interpreting quantum theory) was done 50 years ago.

Ge?ndert von TomS (26.09.18 um 23:57 Uhr)
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