repulsive force
General (r, p) ? ?2f = 4pGN (r + 3p/c2)
- Source of gravity = not only mass, but also pressure
- Negative pressure (opposite sign) = repulsion
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?2f ? -L, f ? -L r2, FL (= - ? f ) = +L r a repulsive force that increases with distance …can be relevant on cosmic scale
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Negative pressure = source of gravitational repulsion