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I am not talking about an antigravity effect that would cancel gravity, rather if there is a repulsive force, like when you use two magnets and flip one of them, where it becomes obvious that one is pushing away the other.

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    $\begingroup$ You might want to take a look at this question on physics.stackexchange.com $\endgroup$
    – Adwaenyth
    Commented Jul 3, 2017 at 7:22
  • $\begingroup$ Are you asking about Dark Energy (the force that appears to be accelerating the expansion of the universe)? $\endgroup$
    – BillDOe
    Commented Jul 3, 2017 at 19:48

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No.

No such effect has been discovered. Gravity seems to be always attractive, never repulsive. Nor has a particle with negative mass ever been discovered. In particular, antimatter appears to have positive mass.

It is not theoretically impossible, but a particle with negative mass would be very odd, as the faster it moved, the less momentum and energy it would have.

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  • $\begingroup$ Note that the reversed energy<--> speed thing is part of tachyon lore, tho' I do not know how putative tachyons are supposed to respond to gravity $\endgroup$
    – Carl Witthoft
    Commented Jul 3, 2017 at 11:11
  • $\begingroup$ Does anything move, i.e. mass has velocity? If gravity is due to spacetime warp, not attraction, the warp caused density or less dense distribution of matter, there is no speed for matter doesn't move since in quantum the same particle appears over all the places... my hypothetical imagination only :). $\endgroup$
    – Mishu 米殊
    Commented Jul 3, 2017 at 13:49
  • $\begingroup$ @Mishu米殊 Spacetime tells matter how to move; matter tells spacetime how to curve. $\endgroup$
    – Dhruv Saxena
    Commented Jul 4, 2017 at 19:44

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