Wangler
Master Poster
- Joined
- Feb 20, 2008
- Messages
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Hey,
I was reading Peebles, "Principles of Physical Cosmology", 1993.
On page 139, in a section talking about "Blackbody Radiation in an Expanding Universe" he says:
What? No global energy conservation in general relativity?
How can that be?
Say it isn't so!
Can anyone clear this up, without me having to regurgitate the entire chapter here?
I was reading Peebles, "Principles of Physical Cosmology", 1993.
On page 139, in a section talking about "Blackbody Radiation in an Expanding Universe" he says:
Peebles said:The second confusing point is the nature of energy balance in the CBR............The resolution of this apparent paradox is that while energy conservation is a good local concept, as in equation (6.18), and can be defined more generally in the special case of an isolated system in asymptotically flat space, there is not a general global conservation law in general relativity theory.
What? No global energy conservation in general relativity?
How can that be?

Say it isn't so!
Can anyone clear this up, without me having to regurgitate the entire chapter here?