In physics, a pseudo-scalar is a quantity that behaves like a scalar, except that it changes sign under a parity inversion such as improper rotations while a true scalar does not.
Can someone show me the graphical picture or illustration that how a scalar changes under rotations?
Why we can't say it as vector, if just the sign of the quantity changes? What is the fundamental difference between a vector and pseudo-scalar?
Why is the Klein-Gordon equation an equation of motion for a pseudo-scalar field?