Giovanni Montani et al 2003 Class. Quantum Grav. 20 4195 doi:10.1088/0264-9381/20/19/305
Giovanni Montani1, Remo Ruffini1 and Roustam Zalaletdinov1,2,3
Show affiliationsA model for the static weak-field macroscopic medium is analysed and the equation for the macroscopic gravitational potential is derived. This is a biharmonic equation which is a non-trivial generalization of the Poisson equation of Newtonian gravity. In the case of strong gravitational quadrupole polarization, it essentially holds inside a macroscopic matter source. Outside the source the gravitational potential fades away exponentially. The equation is equivalent to a system of the Poisson equation and the non-homogeneous modified Helmholtz equations. The general solution to this system is obtained by using the Green function method and it is not limited to Newtonian gravity. In the case of insignificant gravitational quadrupole polarization, the equation for macroscopic gravitational potential becomes the Poisson equation with the matter density renormalized by a factor including the value of the quadrupole gravitational polarization of the source. The general solution to this equation obtained by using the Green function method is limited to Newtonian gravity.
Issue 19 (7 October 2003)
Received 8 May 2003
Published 1 September 2003
Giovanni Montani et al 2003 Class. Quantum Grav. 20 4195
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