Why is the Gravitational Mass Equal to the Inertial Mass?
In  a variational principle for the fundamental equations of Classical Physics was introduced. The basic point of this principle is that the world-line z = z(σ) of a material point is parametrized by a parameter σ which carries some physical information, namely, it is related to the rest mass and to the charge. In particular the inertial mass will not be a property of a material point, but will be a constant of the motion which is determined by the initial conditions with respect the parameter σ. One of the main features of this principle is the fact that it permits us to deduce the equality between inertial and gravitational mass. Here we briefly review some of the results contained in .
KeywordsVariational Principle Bilinear Form Covariant Derivative Material Point Fundamental Equation
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