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Famous the world over for the creative brilliance of his insights into the physical world, Nobel Prize-winning physicist Richard Feynman also possessed an extraordinary talent for explaining difficult concepts to the nonscientist. QED--the edited ver Famous the world over for the creative brilliance of his insights into the physical world, Nobel Prize-winning physicist Richard Feynman also possessed an extraordinary talent for explaining difficult concepts to the nonscientist. QED--the edited version of four lectures on quantum electrodynamics that Feynman gave to the general public at UCLA as part of the Alix G. Mautner Memorial Lecture series--is perhaps the best example of his ability to communicate both the substance and the spirit of science to the layperson.The focus, as the title suggests, is quantum electrodynamics (QED), the part of the quantum theory of fields that describes the interactions of the quanta of the electromagnetic field-light, X rays, gamma rays--with matter and those of charged particles with one another. By extending the formalism developed by Dirac in 1933, which related quantum and classical descriptions of the motion of particles, Feynman revolutionized the quantum mechanical understanding of the nature of particles and waves. And, by incorporating his own readily visualizable formulation of quantum mechanics, Feynman created a diagrammatic version of QED that made calculations much simpler and also provided visual insights into the mechanisms of quantum electrodynamic processes. In this book, using everyday language, spatial concepts, visualizations, and his renowned "Feynman diagrams" instead of advanced mathematics, Feynman successfully provides a definitive introduction to QED for a lay readership without any distortion of the basic science. Characterized by Feynman's famously original clarity and humor, this popular book on QED has not been equaled since its publication. ...Continua

QED

Ha scritto il 29/11/10

If you really want to understand Quantumn physics, start with this one!

Feynman is SUCH A GENIUS! He explain QED better than any other similar book. He can really explain the full complexity without using high mathematics. He proofs that, layman can understand physics too.... if only they meet the good teachers who can s

Feynman is SUCH A GENIUS! He explain QED better than any other similar book. He can really explain the full complexity without using high mathematics. He proofs that, layman can understand physics too.... if only they meet the good teachers who can speak really clearly.

And, he is so honest to tell everybody the truth: NOBODY UNDERSTAND QUANTUMN PHYSICS!!! EVEN FEYNMAN DOES NOT UNDERSTAND IT!

So what, it is so complicated, and we are working on it. It is MUCH better to admit it, and then humbly work on this problem.... one day.... we should be able to crack it!

Read it, if you really want to understand quantumn physics (as scientist understand it so far).

...ContinuaQED

Ha scritto il 11/04/10

Richard Feynman is by far one of the best writers of physics, because he can explain very difficult matters with easy words. Of course, the book asks some basic understanding of particle physics, but you start with very simple statements and from tha

Richard Feynman is by far one of the best writers of physics, because he can explain very difficult matters with easy words. Of course, the book asks some basic understanding of particle physics, but you start with very simple statements and from that you learn one of the best physics theories developed so far. For some reason, everybody knows the name of Einstein and few know about Feynman, but he is by sure one of the genius of the 20th century.

...ContinuaQED

Ha scritto il 12/04/07

A book aims at a non-technical audience -- you can probably understand it if you can do arithmetic without using a calculator. (An ability that has become less-than-common these days, I realize.) Therefore it is not listed under my "intimidating ph

A book aims at a non-technical audience -- you can probably understand it if you can do arithmetic without using a calculator. (An ability that has become less-than-common these days, I realize.) Therefore it is not listed under my "intimidating physics books" section.

The book is about Quantum ElectroDynamics, QED for short, a theory Feynman himself has contributed a lot to. It is a quantum description of the electromagnetic field, and how it interacts with matters carrying electric charge.

Feynman attempted to give an intuitive picture to everything he talked about. His usual style. And he is largely successful, although sometimes pictures he painted, while being technically correct, are very far from how people actually deal with the problem.

With one exception, though.

Near the end of the book, he described some then unsolved mysteries surrounding QED. Back then one of the biggest problems bugging physicists for years was those annoying infinities you get for virtually any calculation in QED.

Sure, there are ways ("renormalization", we call it) to get rid of these infinities -- but back then it wasn't so clear to physicists if this renormalization procedure is legitimate at all.

(There is a cartoon, still to be seen on the wall somewhere in every particle theory group's office space, making fun of how people "sweep all the infinities under the rug".)

Feynman of course wrote about this issue in the book, and said that the need of renormalization signifies something's not right.

Well, the general view on this issue changed during the '70s; the meaning of renormalization was re-interpreted by Kenneth Wilson. It is not to be thought of as just an exercise to remove "unphysical" infinities. But rather we admit that our theory is incomplete; it is going to fail when we push it to the extreme short-distance limit. The infinities signal the failure of the theory, and before we know what lies beyond (which we still don't), the sensible thing to do is to cut away this extreme limit.

Can't foul Feynman for not knowing the future development when he wrote the book. But just want to point out that his take on this issue is somewhat outdated.

...Continua
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