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Could dark energy be negative gravity?

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Could dark energy (the mysterious accelerating expansion of the universe) be explained by "negative gravity"? But it already is "negative gravity". In general relativity, the stress-energy tensor T μ ν describes the energy, momentum, and stress of matter in spacetime. read more

Dark energy is not negative gravity. While it does the opposite of gravity, it behaves in much different ways. Gravity is caused by mass, and decreases with distance exponentially (to be exact to the power of -2). Dark energy is constant everywhere, but is very weak, so does not have a significant effect in short distances. read more

But it already is "negative gravity". In general relativity, the stress-energy tensor $T_{\mu\nu}$ describes the energy, momentum, and stress of matter in spacetime. read more

Yes: Dark energy could be (and are) negative mass (neutrinos). Negative relativistic mass would also have negative energy, and negative gravity. Dark energy behaves exactly like negative gravity. According to both Newton and Einstein negative gravity can arise from negative energy and its equivalent negative relativistic mass. read more

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