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Theory of relativity

Causality (physics)
Physics of the cause–effect relation
Cherenkov radiation
Electromagnetic phenomenon
Einstein field equations
Field-equations in general relativity
Energy–momentum relation
Relativistic equation relating total energy to invariant mass and momentum
Equivalence principle
Principle of general relativity stating that inertial and gravitational masses are equivalent
First observation of gravitational waves
Gravitational wave event
Four-momentum
4D relativistic energy and momentum
Four-vector
Vector in special relativity well-behaved with respect to Lorentz transformations
General relativity
Einstein's theory of gravitation as curved spacetime
Gravitational singularity
Condition in which spacetime itself breaks down
Gravitational time dilation
Form of time dilation
Gravitational wave
Propagating spacetime ripple
Hawking radiation
Black-hole radiation predicted by Stephen Hawking
Introduction to general relativity
Theory of gravity by Albert Einstein
Kerr–Newman metric
Equations in general relativity
Ladder paradox
Thought experiment in special relativity: a ladder parallel to the ground moves horizontally; due to length contraction it fits inside a garage; but from the ladder's frame, the garage will be contracted to be smaller and cannot contain the ladder
Length contraction
Contraction of length in the direction of propagation in Minkowski space
Lorentz factor
Factor by which time, length, and relativistic mass change for an object while that object is moving.
Lorentz transformation
Family of linear transformations
Luminiferous aether
Obsolete postulated medium for the propagation of light
Mathematics of general relativity
Mathematical structures and techniques used in the theory of general relativity
Michelson–Morley experiment
1887 experiment that failed to detect a supposed medium carrying light waves
Minkowski space
Mathematical space setting which eases explanation of special relativity
No-hair theorem
Theorem related to black holes
Principle of relativity
Physics principle stating that the laws of physics must be the same in all reference frames
Proper time
Elapsed time between two events as measured by a clock that passes through both events
Relativity of simultaneity
Concept that distant simultaneity is not absolute, but depends on the observer's reference frame
Spacetime diagram
Graph of space and time in special relativity
Special relativity
Theory of interwoven space and time by Albert Einstein
Stress–energy tensor
Tensor describing the density and flux of energy in spacetime
Tests of general relativity
Scientific experiments
Theory of relativity
Two interrelated physics theories by Albert Einstein
Time dilation
Measured time difference as explained by relativity theory
Twin paradox
Thought experiment in special relativity
White hole
Hypothetical region of spacetime and singularity that cannot be entered from the outside