By Richard Phillips Feynman, Laurie M. Brown
This can be a number of medical papers by means of Richard Feynman, popular for his or her wonderful content material and the author's remarkable kind. they're grouped via subject: direction necessary method of the rules of quantum mechanics and quantum box conception, renormalized quantum electrodynamics, concept of superfluid liquid helium, thought of the Fermi interplay, polarons, gravitation, partons, computing device concept, and extra. reviews on Feynman's issues are supplied by way of the editor, including biographical notes and a whole bibliography of Feynman's courses
Read or Download Selected Papers of Richard Feynman: With Commentary PDF
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Additional info for Selected Papers of Richard Feynman: With Commentary
Example text
However, the theory of action a t a distance predicts that an accelerated charge in otherwise charge-free space will experience no electric force. To exclude the acceleration and thus to avoid the ,issue does not appear reasonable. Uncharged particles can be present and can accelcrate the charge via gravitational forces. I t seems just as difficult to explain the reactive force when other charged particles are present. They will indeed be set into motion and will act back on the source. However, if these elementary interactions have the purely retarded character assumed by Ritz, and also by Frenkel,' the reaction will arrive a t the accelerated particle too late and will have the wrong magnitude' to produce the damping phenomenon.
I t is the plan of a subsequent divisioii to discuss the problems which arise when the fields a r e regarded a s subordinate entities with no degrees of freedoin of their own. An infinite number of degrees of freedom ar c found to be attributed to the particles themselves by the theory of propagated action a t a distance. Hoivever, it appears t h a t the additional modes of motion are divergent an d have on this account to be excluded by a general principle of selection. -J. \V. Niels Bohr, Atomic Theory and the Description of Nature (Cambridge University Press, Teddington, England, 1934).
Physical reasoning does help some people to generate suggestions as to how the unknown may be related to the known. Theories of the known, which are described by different physical ideas may be equivalent in all their predictions and are hence scientifically indistinguishable. However, they are not psychologically identical when trying to move from that base into the unknown. For different views suggest different kinds of modifications which might be made and hence are not equivalent in the hypotheses one generates from them in ones attempt to understand what is not yet understood.