Question

What is the experimental evidence for the gravitational field having positive energy density?

Answer 1

The observed fact that the orbits of binary pulsars decay, and the assumption that the decay is due to emission of gravitational waves, is interpreted by some to imply that the energy density of the gravitational field is positive.

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Answer 2

Explanation:

Quantum vacuum should be considered as a new state of matter-energy, completely ... Hence, Eq. (1) can be used for the gravitational field, only if, particles and antiparticles