How did the constant $\pi$ creep into Einstein's field equation?
75731
Significance of $\pi$ in physics
40683
What's wrong with the square root version of the Klein-Gordon equation?
2754
Why and how is the speed of light in vacuum constant, i.e., independent of reference frame?
157779
What does the Jacobi identity impose on structure constants?
124703
Where does the $i$ come from in the Schrödinger equation?
130166
Equivalece of the geodesic equation and the continuity equation for the energy-momentum tensor
45131
Derivation of equations of motion in Nordstrom's theory of scalar gravity?
1206
GR. Einstein's 1911 Paper: On the Influence of Gravitation on the Propagation of Light
5247
Physical meaning of non-trivial solutions of vacuum Einstein's field equations
123571
A change in the gravitational law
116728
Why does speed of light have to be constant?
106863
Special relativity and imaginary coefficient of the time coordinate
86428
Can we show that the decimal expansion of $\pi$ doesn't occur in the decimal expansion of the Champernowne constant?
140580
Gravitational potential of an approaching mass
129289
What is the origin of the factor of $-1/4$ in the Maxwell Lagrangian?
151110
The Interaction between the fundamental gravitational strings
61794
Interesting and unexpected applications of $\pi$