In theoretical physics, negative mass is a hypothetical concept of matter whose mass is of opposite sign to the mass of normal matter. Such matter would violate one or more energy conditions and show some strange properties, stemming from the ambiguity as to whether attraction should refer to force or the oppositely oriented acceleration for negative mass. It is used in certain speculative theories, such as on the construction of wormholes. The closest known real representative of such exotic matter is a region of pseudo-negative pressure density produced by the Casimir effect.
Read more about Negative Mass: Inertial Versus Gravitational, Forward's Analysis, Classical Gravitational Field Theory, Schrodinger Equation, In General Relativity, Gravitational Interaction of Antimatter
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“The negative always wins at last, but I like it none the better for that.”
—Mason Cooley (b. 1927)
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—Henry David Thoreau (1817–1862)