Wednesday, July 08, 2009


As promised, photos from Paris and the "Invisible Universe" meeting. Here is the view from UNESCO headquarters, the conference site. The parade ground lies in front of Ecole Militaire, where French officers are trained.

Eiffel Tower from Champ Du Mars. In 1783 the Montgolfier Brothers launched their first manned balloon from this site. Since radios were introduced a century ago, the tower has been a natural site for transmitting antennas. Signals radiate outward at the speed of light. Space and Time are one phenomenon, also related by the speed of light. If an event is outside this expanding sphere, its separation is spacelike-the tower's signal is too late to affect that event. If you are "within the sound of my voice" our separation is timelike, literally a matter of time. From this simple principle (without a fixed c) one can derive all the equations of the Lorentz tranformation.

Wednesday the scientists took a boat tour down the Seine and around Ile St. Louis. A long day of meetings leaves one worse for wear. On a hot Summer night crowds gathered around the riverbanks. In the cafe atmosphere of Paris, scientists discussed new ideas like a changing speed of light.

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Blogger nige said...

Thank you for the beautiful pictures of Paris, and you are beautiful yourself as usual! Lovely legs, if that's not a sexist pig type comment. I haven't seen the Eiffel Tower since I was 17. Later I fell asleep on the Paris Metro system very late after a couple of drinks, then my ticket wouldn't work to get a tube back to my hotel. I was probably way out of the paid for zone by then, so with a couple of others who had the same problem, I had to climb over some barriers to catch a train back. It was fun.

Hope the physics discussions are helpful!

11:28 AM  
Blogger mark said...

cogent explanations as mind still bends thinking about space-time

3:09 AM  
Blogger L. Riofrio said...

Thank you, nige! It is difficult keeping one's shape with all the food around. Nice hearing from yoiu too, mark.

1:04 PM  
Anonymous San Antonio Wedding venues said...

The only thing that would have made these guys better would have been better communication in the earlier planning stages, but it all worked out great in the end.

1:02 AM  

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