/r/AskPhysics

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Is the cosmic background radiation truly an obstruction?

4 upvotes • Kruse002

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If we consider two spacetime manifolds equivalent in GR if there exists a diffeomorphism between them, why is it that although the sphere and the general ellipsiod are diffeomorphic, there is a metric that can distinguish between them?

4 upvotes • Outside-Writer9384

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Air planes

4 upvotes • Interesting-Tale5656

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Physics book recommendations for a CS major seeking general knowledge?

4 upvotes • Opposite-Clue-4871

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Books for learning physics

3 upvotes • TopAir64

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How long will it take for half of the stuff in our observable universe to go outside the light mark due to expansion?

3 upvotes • Dekobit

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Arguments for why the 1D Ising model doesn’t have a phase transition?

3 upvotes • One_Significance2195

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Cosmic speed limit vs inertial frame equivalence.

3 upvotes • xKiwiNova

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A "different" definition of conservative force

3 upvotes • ROBIN_AK

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(Optics) Since when is lens diameter = focal length?

3 upvotes • mysteryofthefieryeye

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Is the cosmic background radiation truly an obstruction?	4	Kruse002
If we consider two spacetime manifolds equivalent in GR if there exists a diffeomorphism between them, why is it that although the sphere and the general ellipsiod are diffeomorphic, there is a metric that can distinguish between them?	4	Outside-Writer9384
Air planes	4	Interesting-Tale5656
Physics book recommendations for a CS major seeking general knowledge?	4	Opposite-Clue-4871
Books for learning physics	3	TopAir64
How long will it take for half of the stuff in our observable universe to go outside the light mark due to expansion?	3	Dekobit
Arguments for why the 1D Ising model doesn’t have a phase transition?	3	One_Significance2195
Cosmic speed limit vs inertial frame equivalence.	3	xKiwiNova
A "different" definition of conservative force	3	ROBIN_AK
(Optics) Since when is lens diameter = focal length?	3	mysteryofthefieryeye