2 papers
physics.class-ph2009
Evanescent gravitational mass
Lluis Bel
A simple and {\it innocent} modification of Poisson's equation leads to a modified Newtonnian theory of gravitation where a localized and {\it positive} energy density of the gravi…
gr-qc2008
Space-time models derived from Schwarzschild's solution
Lluis Bel
We discuss two space-time models: one is expanding, the other is static. They are both derived from Schwarzschild's exterior solution. But they differ in the implementation of the…