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April 13th, 2017, 07:37 AM   #1
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Bose-Einstein condensate with negative effective mass!

Physicists Say They've Created a Fluid With 'Negative Mass' - ScienceAlert

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April 13th, 2017, 08:09 AM   #2
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I've come across negative effective mass in relation to the Hall effect.
This is well documented.

Effective mass usually refers to the inertial mass which may act differently from the gravitational mass in appropriate circumstances

It is one of the wonders of Nature that in normal (ie most) circumstances the gravitational mass and the inertial mass are the same.
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