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Gravitationally-interacting massive particles (GIMPs) are a set of particles to explain the Dark Matter in our universe (rather than the attempt to use weakly-interacting particles called WIMPs). Dark Matter was postulated by F. Zwicky in 1933 who noticed the failure of the velocity curves of stars to decrease when plotted as functions of their distance from the center of galaxies. Since Einstein's work, our universe is described by four-dimensional spacetime whose metric is calculable by the field equation EFA:

Here $Rμν$ is the Ricci curvature tensor, $R$ the scalar curvature, $gμν$ the metric tensor, $G$ Newton's gravitational constant, $c$ the speed of light in vacuum, and $Tμν$ the stress–energy tensor. The constant $Λ$ is the so-called cosmological constant.

While WIMPs would be elementary particles which can in principle be studied by experimentalists in laboratories such as CERN (like all the other elementary particles), the proposed particles called GIMPs would follow the above Einstein equation. They are just singular structures of spacetime in a geometry whose average form the dark energy that Einstein expressed in his cosmological constant. The identification of "Dark Matter" with GIMPs proposed in Ref. makes Dark Matter a Dark Energy filled with singularites, a kind of curdled Dark Energy. This would roughly verify Einstein's old dream that all particles in the universe would follow his equation. If we identify all matter as the sum of dark energy plus dark matter in the form of GIMPs, his expectation turns out to have been almost right. The sum of Dark Matter plus Dark Energy make up 76% of all matter, and that is enough to make computer simulations produce a good impression of the behavior of all matter.