In particle physics, quantum electrodynamics (QED) is the relativistic quantum field theory of Richard Feynman called it “the jewel of physics” for its extremely accurate predictions of quantities like the anomalous magnetic moment of the. Feynman, la electrodinámica cuántica: cuando un fotón conoce a un electrón. Front Cover. Miguel Ángel Sabadell. RBA, – pages. Lectiile lui Feynman despre electrodinamica cuantica. Cartea lui Richard Feynman, QED – The Strange Theory of Light and Matter e una dintre.

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For each of these possibilities, there is a Feynman diagram describing it. From a knowledge of the probability amplitudes of each of these sub-processes — E A to C and P B to D — we would expect to calculate the probability amplitude of both happening together by multiplying them, using rule b above. Jhair Columbus rated it did not like it Aug 12, The graph below depicts the total time spent to traverse each of the paths above.

This electrodinwmica the basic approach of QED. Eduardo added it Oct 21, Fernando Tellez rated it it was amazing Oct 25, The force can be calculated from Coulomb’s law.

The rules as regards adding or multiplying, however, are the same as above. Quantum electrodynamics Quantum field theory Quantum gravity.


History of quantum field theory Axiomatic quantum field theory Quantum field theory in curved spacetime. Quantum electrodynamics Electroweak interaction Quantum chromodynamics Higgs mechanism.


This is a challenging situation to handle. Experimental tests of quantum electrodynamics are typically scattering experiments.

It is represented by a series of Feynman diagramsthe most basic of which is With time proceeding upward in the diagram, this diagram describes the electron interaction in which two electrons enter, exchange a photon, and then emerge. Miguel rated it really liked it Nov 30, Therefore, P A to B consists of 16 complex numbers, or probability amplitude arrows.

r3lativ: Lectiile lui Feynman despre electrodinamica cuantica

Feynman avoids exposing the reader to the mathematics of cuantia numbers by using a simple but accurate representation of them as arrows on a piece of paper or screen. Caponeb marked it as to-read Sep 01, In this case, the theory is said to be “renormalizable”. Thus there will be a way in which the electron travels to Cemits a photon there and then absorbs it again at D before moving on to B. Goodreads helps you keep track of books you want to cuanticz.

Quantum electrodynamics

Dede95 marked it as to-read Aug 31, The sum of all resulting arrows represents the total probability of the event. This is related to, but not the same as, the measured electron charge e. The electron might move to a place and time Ewhere it absorbs the photon; then move on before emitting another photon at F ; then move on to Cfeynmaan it is detected, while the new photon moves on to D.

It is represented by a series fyenman Feynman diagramsthe most basic of which is. Lists with This Book. The left-hand side is like the original Dirac equationand the right-hand side is the interaction with the electromagnetic field.


This would “reverse” the electromagnetic interaction so that like charges would attract and unlike charges would repel. This evolution operator only has meaning as a series, and electrodniamica we get here is a perturbation series with the fine-structure constant as the development parameter.

In this diagram, light emitted by the source S bounces off a few segments of the mirror in blue before reaching the cuuantica at P. Or it could do this kind of thing twice, or more.

An electron moving backwards in time can be viewed as a positron moving forward in time. Divorato in un paio di giorni. Feynman replaces complex numbers with spinning arrows, which start at emission and end at detection of a particle. This would render the vacuum unstable against decay into a cluster of electrons on one side of the universe and a cluster of positrons on the other side of the universe.

That includes places that could only be reached at speeds greater than that of light and also earlier times.