Washington State University physicists have created a fluid with negative mass. Genrally when you apply force F=ma the mass move in the direction of the force ,but in case of negative mass the direction is opposite to the force applied, that is it accelarates backwards.
The necessary conditions for negative mass were created by cooling rubidium atoms to just a hair above absolute zero, creating what is known as a Bose-Einstein condensate called superfluid state in which the particles synchronize and move in unison without losing energy. This was achieved using lasers .
A second set of lasers were applied that kicked the atoms back and forth and changed the way they spin. Now when the rubidium rushes out fast enough, it behaves as if it has negative mass. Once you push, it accelerates backwards.
The problem with negative mass is that it appears to violate the energy condition. Indeed, that’s how theoretical physicists have been able to show how negative mass could be used to create exotic objects like wormholes.
Saoussen Mbarek and Manu Paranjape at the Université de Montréal in Canada say they’ve found a solution to Einstein’s theory of general relativity that allows negative mass without breaking any essential assumptions.
The crucial breakthrough by Mbarek and Paranjape is to show that negative mass can produce a reasonable Schwarzschild solution without violating the energy condition. Their approach is to think of negative mass not as a solid object, but as a perfect fluid, an otherwise common approach in relativity.
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