| 11. | So electrons near the top of the valence band behave like they have negative mass.
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| 12. | :: : We have a negative mass article, which has some discussions about its properties.
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| 13. | By contrast, the hypothetical exotic matter has a negative mass and the energy-momentum equation is
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| 14. | :Negative mass ( if it existed ) would not cause an upward dent in space.
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| 15. | Rather, negative mass would cause there to be less space in the middle, instead of more.
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| 16. | Sometimes they predict absurdities like subatomic particles with negative masses or even negative probabilities of existing.
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| 17. | Such materials would possess qualities like negative mass or being repelled rather than attracted by gravity.
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| 18. | In considering negative mass, it is important to consider which of these concepts of mass are negative.
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| 19. | Negative mass would possess some strange properties, such as accelerating in the direction opposite of applied force.
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| 20. | This method can even work for objects with holes, which can be accounted for as negative masses.
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