Authors: Fran De Aquino
Newton's 2nd law of motion tells us that objects accelerate in the same direction as the applied force. However, recently it was shown experimentally that a Superfluid Bose-Einstein Condensate (BEC) accelerates in the opposite direction of the applied force, due to the inertial mass of the BEC becoming negative at the specifics conditions of the mentioned experiment. Here we show that is not the inertial mass but the gravitational mass of the BEC that becomes negative, due to the electromagnetic energy absorbed from the trap and the Raman beams used in the experimental set-up. This finding can be highly relevant to the gravitation theory.
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