Conditions permitting rotation to imaginary time
124863
Performing Wick Rotation to get Euclidean action of a scalar field $\Psi$
100530
Why does time in Minkowski's space have the opposite sign of the space coordinates?
258
Existence of orthogonal coordinates on a Riemannian manifold
66618
Quantum spin in a rotating reference frame
664
Minkowski's complex Euclidean space vs. the real pseudo-Euclidean version
16786
Is there any case in physics where the equations of motion depend on high time derivatives of the position?
121914
Unitary representations of the diffeomorphism group in curved spacetime
29064
Can the real and imaginary parts of $\dfrac{\sin z}z$ be simplified?
43343
How to derive addition of velocities without the Lorentz transformation?
136578
How to make something rotate a certain amount over an exact amount of time
86381
What is imaginary time?
116314
On-shell and off-shell transformations in Noether's theorem
81863
Gaussian integral with imaginary coefficients and Wick rotation
9016
How can time dilation be symmetric?
107319
$F=ma$ contest problem on angular momentum
132525
Real Numbers Raised to Imaginary Powers?
82624
"Newtonian limit" property of special relativity