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What exact vacuum solution models a rotating, uncharged black hole in general relativity?
Answer
Kerr metric
What dimensionless factor equals 1/sqrt(1−v²/c²) in special relativity?
Answer
Lorentz factor
What spacetime is the maximally symmetric vacuum solution with a positive cosmological constant?
Answer
de Sitter space
What general-relativity effect is the precession of a gyroscope caused by spacetime curvature?
Answer
Geodetic effect
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Latest trivia questions
What dimensionless factor equals 1/sqrt(1−v²/c²) in special relativity?
Answer
Lorentz factor
Which effect makes a clock lower in a gravitational field tick more slowly than one higher up?
Answer
Gravitational time dilation
What is the relativistic four-vector version of ordinary velocity called?
Answer
Four-velocity
What diagram shows events in special relativity with time and space axes?
Answer
Minkowski diagram
What spacetime is the flat, gravity-free model used in special relativity?
Answer
Minkowski spacetime
Which tensor represents matter and energy in Einstein's field equations?
Answer
Stress-energy tensor
What tensor is used to describe spacetime curvature in the Einstein field equations?
Answer
Einstein tensor