Time-like space-time paths have points where space-time curvature and path curvature are not the same, and net gravity is zero {general energy condition}.
For classical matter, energy density is greater than or equal to zero in all reference frames {weak energy condition}. However, weak energy condition is false for quantum-mechanical scales.
For classical matter for long enough distances, energy density is greater than or equal to zero for all time-like paths {strong energy condition}. However, strong energy condition is false for quantum-mechanical scales.
Physical Sciences>Physics>Relativity>General Relativity>Energy
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Date Modified: 2022.0224