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On gravitational repulsion. (English) Zbl 0892.53045

Summary: The concepts of negative gravitational mass and gravitational repulsion are alien to general relativity. Still, we show here that small negative fluctuations – small dimples in the primordial density field – that act as if they have an effective negative gravitational mass, play a dominant role in shaping our Universe. These initially tiny perturbations repel matter surrounding them, expand and grow to become voids in the galaxy distribution. These voids – regions with a diameter of \(40h^{-1}\) Mpc which are almost devoid of galaxies – are the largest objects in the Universe.

MSC:

53Z05 Applications of differential geometry to physics
83F05 Relativistic cosmology

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