Why Empty universe have to obey the Negative Curvature?
51742
What is the curvature of an empty universe?
81969
What if the universe is rotating as a whole?
11890
Can you create an illusion of empty space?
99154
Why is the covariant derivative of the metric tensor zero?
113659
Why was the universe in an extraordinarily low-entropy state right after the big bang?
51901
Ambiguity in applying Newton's shell theorem in an infinite homogeneous universe
115517
How could we know that the relativistic curvature of universe is intrinsic?
112308
Why is the gravitational potential energy defined as negative?
63346
How can the universe expand if there is gravitation?
23807
WKT: What is the reasoning behind the concept of a POINT EMPTY?
119336
Zero energy universe
123415
Spacial curvature and expanding space
79861
Induced metric on a null hypersurface
111578
Why is gravitational potential energy negative, and what does that mean?
73935
Why the temperature is getting lower when the universe is expanding
44342
Negative Mass and gravitation
2377
Is the total energy of the universe zero?