Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2005-05-10
Am.J.Phys. 74 (2006) 607-613
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
28 pages, 4 figures
Scientific paper
10.1119/1.2198881
After a historical introduction to Poisson's equation for Newtonian gravity, its analog for static gravitational fields in Einstein's theory is reviewed. It appears that the pressure contribution to the active mass density in Einstein's theory might also be noticeable at the Newtonian level. A form of its surprising appearance, first noticed by Richard Chase Tolman, was discussed half a century ago in the Hamburg Relativity Seminar and is resolved here.
Ehlers Juergen
Ozsvath Istvan
Schucking Engelbert
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