hw4b - b) What is surprising about the photon’s proper...

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Ph 444 Problem Set 5 Due: Friday, October 15, 2010 1. Ryden problem 5.4. 2. Ryden problem 6.3. 3. In class this week, I presented an interesting derivation for a ±at, dust-²lled Universe of the proper distance of a photon as a function of time that originates on the current particle horizon. a) Reproduce that derivation in its entirety.
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Unformatted text preview: b) What is surprising about the photon’s proper distance from us for about 30% of its light travel time? c) Comment on how this contrasts with its co-moving coordinate distance. (Note: this problem will count for DOUBLE the usual point value, i.e. it will be worth 10 points)...
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This note was uploaded on 02/06/2012 for the course PHYSICS 444 taught by Professor Staff during the Fall '08 term at Rutgers.

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