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atyy
#50
Feb29-12, 12:33 AM
Sci Advisor
P: 8,535
Quote Quote by waterfall View Post
I know. I have read it. Milne Universe doesn't describe out universe so let us forget it. My question is simply how spin-2 field on flat spacetime expand in the Big Bang? Pls just describe how. Thanks.
The basic idea is expanding space (not expanding spacetime) is just curved spacetime. Spin-2 on flat spacetime produces curved spacetime.