Is spacetime an actual tangible "fabric of the universe", or a mathematical construct?
98292
What is spacetime?
70008
Virtual Particles real? Virtual particles create a universe?
92343
Does cosmological time expand like space does?
27547
How energy curves spacetime?
50566
Nature of gravity: gravitons, curvature of space-time or both?
66193
How to prove that a flat spacetime admits Minkowski coordinates?
10209
How to show the spacetime interval is invariant in general?
119639
Do photons bend spacetime or not?
96564
Is it valid to apply Einstein's Relativity to scenarios involving expansion of space?
147647
Spacetime around a massive cylinder
43724
What do spacelike, timelike and lightlike spacetime interval really mean?
38703
Do virtual particles actually physically exist?
144208
Does String theory say that spacetime is not fundamental but should be considered an emergent phenomenon?
122357
Discreteness of Spacetime and Violation of Lorentz symmetry
117108
Is the Universe being dragged into a singularity rather than expanding?
54395
Is Poincare recurrence relevant to our universe?
33554
Can the problem of unification of Quantum Mechanics and General Relativity be converted into a pure Mathematical problem?