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2Physics Quote:
"Can photons in vacuum interact? The answer is not, since the vacuum is a linear medium where electromagnetic excitations and waves simply sum up, crossing themselves with no interaction. There exist a plenty of nonlinear media where the propagation features depend on the concentration of the waves or particles themselves. For example travelling photons in a nonlinear optical medium modify their structures during the propagation, attracting or repelling each other depending on the focusing or defocusing properties of the medium, and giving rise to self-sustained preserving profiles such as space and time solitons or rapidly rising fronts such as shock waves." -- Lorenzo Dominici, Mikhail Petrov, Michal Matuszewski, Dario Ballarini, Milena De Giorgi, David Colas, Emiliano Cancellieri, Blanca Silva Fernández, Alberto Bramati, Giuseppe Gigli, Alexei Kavokin, Fabrice Laussy, Daniele Sanvitto. (Read Full Article: "The Real-Space Collapse of a Two Dimensional Polariton Gas" )

Thursday, May 05, 2005

Feynman on Commemorative Stamp


Richard P. Feynman, the late Nobel laureate and Caltech professor, is
widely regarded as one of the most influential physicists of the 20th
Century. Today United States Post Office has released a commemorative
stamp in honor of this great Physicist of 20th century.

Anyone interested in Modern Physics could never escape reading about
Feynman and his path-breaking works especially on Quantum
Electrodynamics and many other aspects of particle physics. The series
of lectures that he gave to Caltech undergraduates is celebrated as the
most comprehensive account of Modern Physics and if you have not yet
read his autobiography "Surely you are joking, Mr. Feynman" and a
sequel "What do you care what other people say", you must finish those
right now!

We cannot really describe Feynman, his work and his spectacular life in
two or three paragraphs of this posting. So, you may start with those books.Posted by Hello


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