Can spacetime be curved even in absence of any source?
5247
Physical meaning of non-trivial solutions of vacuum Einstein's field equations
9388
Can matter be described as the result of the curvature of space, instead of vice versa?
42584
Curved space-time VS change of coordinates in Minkowski space
23359
Does the Planck scale imply that spacetime is discrete?
149777
Is it true that a space-filling curve cannot be injective everywhere?
105323
Why can't gravitons be created in traditional particle accelerators?
140798
Is there absolute proof for gravitational waves?
72901
Can Special Relativity hold even without motion?
2929
How can we recover the Newtonian gravitational potential from the metric of general relativity?
107881
Is it possible that there is no theory of quantum gravity?
38714
Can a metric in General Relativity, Supergravity, String Theory, etc., be asymmetric?
76819
How does "warp drive" not violate Special Relativity causality constraints?
76894
Why is spacetime not Riemannian?
151086
What bends fabric of space-time?
126008
What is the general procedure for constructing the Penrose diagram for an arbitrary $(1+1)d$ spacetime?
105865
The twin paradox and positively curved space
85582
Why aren't all photons virtual particles even in the "vacuum" of empty space?