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.
|Published (Last):||6 October 2014|
|PDF File Size:||18.47 Mb|
|ePub File Size:||19.31 Mb|
|Price:||Free* [*Free Regsitration Required]|
Quantum electrodynamics, commonly referred to as QED, is a quantum field theory of the electromagnetic force. Retrieved from ” https: Therefore, P A to B consists of 16 complex numbers, or probability amplitude arrows. Near the end of his life, Richard P. 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 Cwhere it is detected, while the new photon moves on to D. However, Cuantiica himself remained unhappy about it, calling it a “dippy process”.
Feynman. La electrodinámica cuántica. Cuando un fotón conoce un electrón.
There is a possibility of an electron at Aor a photon at Bmoving as a feynan action to any other place and time in the universe. Thanks for telling us about the problem.
Book ratings by Goodreads. So, for a given process, if two probability amplitudes, v and ware involved, the probability of the process will be given either by. Lists with This Book. In time this problem was “fixed” by the technique of renormalization. That change, from probabilities to probability amplitudes, complicates the mathematics without changing the basic approach.
Quantum electrodynamics – Wikipedia
The electron line represents an electron with a given energy and momentum, with a cuantixa interpretation of the photon line. This would “reverse” the electromagnetic interaction so that like charges would attract and unlike charges would repel.
The sum is then a third arrow that goes directly from the beginning of the first to the end of the second. The sum is found as follows.
Incidentally, the name given to this process of a photon interacting with an electron in this way is Compton scattering. These can all be seen in the adjacent diagram.
A problem arose historically which held up progress for twenty years: Caponeb marked it as to-read Sep 01, Dede95 marked it as to-read Aug 31, The sum of all resulting arrows represents the total probability of the event.
The simplest process to achieve this end is for the electron to move from A to C an elementary action and for the photon to move from B to D another elementary action. A vertex diagram represents the annihilation of one electron and the creation of another together with the absorption or creation of a photon, each having specified energies and momenta.
Index Fundamental force concepts Coupling constants. Reviews of Modern Physics. Feynman avoids exposing the reader to the mathematics of complex numbers by using a simple but accurate representation of them as arrows on a piece of paper or screen. CreateurDeMonst rated it it was ok Jun 14, From a modern perspective, we say that QED is not well defined as a quantum field theory to arbitrarily high energy.
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. Be the first to ask a question about Feynman. The rules as regards adding or multiplying, however, are the same as above. Fernando Tellez rated it it cuajtica amazing Oct 25, Fenyman, if we impose the Lorenz gauge condition.
Despite the electrodinamica cuantica feynman cuantcia of this Feynman approach to QED, almost no early textbooks follow him in their presentation. Grandi idee della scienza 1 – 10 of 43 books. We then, using rule a above, have to add up all these probability amplitudes for all the alternatives for E and F. Chetzyl rated it it was amazing Jun 24, There are no discussion topics on this book yet.
Aloysius rated it liked it Mar 13, The simplest process to achieve this end is for the electron to move from A to C an elementary cuantic and for the photon to move from B to D another elementary action. The amplitude arrows are fundamental to the description of the world given by quantum theory.
Addition and multiplication are common operations in the theory of complex numbers and are given in the figures.
But where you would expect to add or multiply probabilities, instead you add or multiply probability amplitudes that now are complex numbers. The sum of all paths must be taken into account.