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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" )

Monday, July 10, 2006

Upcoming Physics Conferences

From today we start this feature on suggestion from some of our physicist friends. If anyone wishes to freely advertize Physics jobs or conferences in 2Physics, he/she is welcome to put an entry and a web-link following our 'comment' link that can be found at the bottom of any of our postings. From time to time we'll publish the list. Our today's list is for conferences only.

July 18-21: "Quantum reality, relativistic causality, and closing the epistemic circle: an international conference in honour of Abner Shimony" (Waterloo, Ontario, Canada)
July 20-21: "Teaching General Relativity" (Syracuse)
July 23-29: "Eleventh Marcel Grossmann Meeting on General Relativity" (Berlin)
Jul 31-Aug 4: "Cosmic Frontiers" (Durham, UK)
August 1-4: "1st international workshop on transmission of information and energy in nonlinear & complex systems " (Singapore)
August 6-11: "Intl congress on mathematical physics" (Rio de Janeiro, Brazil)
August 7-15: "Key Approaches to Dark Energy" (Barcelona, Spain)
August 24-26: "Quantum Gravity in Americas" (Pennstate)
August 25-29: "3rd Feynman festival" (College Park, Maryland, USA)
September 3-12: "International advanced summer school on modern mathematical physics: theoretical cosmology and observational status of modern cosmology" (Dubna, Russia)
September 7-9: "Maxwell 150 Years On" (Aberdeen, UK)


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