Tuesday, October 27, 2009

Halloween decorations and anti-deSitter space


This year the house decorations seem more frequent and elaborate than in the past. It appears that every third house is decorated while in the past the number was closer to one in ten. I'm not sure what this means but perhaps it's the connection to the earthquakes occurring in Asia. Or I could be wrong. In any case the spider shown here is at least three feet across.
The space we are used to and which is used to do most calculations in science is flat or very close. However there are two additional classes of space that are curved. We learned to use these in non-Euclidean algebra classes. Closed space, with a positive curvature, is shaped like a sphere. The third class of space is open space and is shaped like a saddle. This third type of space is call anti-deSitter space after a mathematician named, you guessed it, deSitter. He did a lot of pioneering mathematics studying curved space. I'm not sure who cares about deSitter space but I think it sounds absolutely foul.
Or not.
Both deSitter space and anti-deSitter space are indicators that we're all on this flight together.

Dick

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