Do Bose Einstein condensates have negative mass?

of Washington State University report their recent experimental work with a Bose-Einstein Condensate (BEC). They observed that this small, incredibly cold cloud of rubidium (Rb) atoms exhibited a “negative effective mass” while expanding.

What is the mass of antimatter?

Antimatter does not have negative mass. In our universe, there is no such thing as negative mass. Mass only comes in positive form. In contrast, electric charge can be positive or negative.

Can masses repel?

Two negative masses would repel because of their negative inertial masses. For different signs however, there is a push that repels the positive mass from the negative mass, and a pull that attracts the negative mass towards the positive one at the same time. — William B. Bonnor, in Negative mass in general relativity.

Is exotic matter real?

Definitions. Exotic matter is a hypothetical kind of matter that has both a negative energy density and a negative pressure or tension that exceeds the energy density. All known forms of matter have positive energy density and pressures or tensions that are always less than the energy density in magnitude.

Is dark matter negative mass?

In the first simulation, all particles have positive mass. In the second one, 84% of particles (the observed fraction of dark matter) have a negative mass.

What if there was negative mass?

Washington State University physicists have created a fluid with negative mass, which is exactly what it sounds like. Push it, and unlike every physical object in the world we know, it doesn’t accelerate in the direction it was pushed. It accelerates backwards. Mass will accelerate in the direction of the force.

How many types of exotic matter are there?

States of matter that are not commonly encountered, such as Bose–Einstein condensates, fermionic condensates, nuclear matter, quantum spin liquid, string-net liquid, supercritical fluid, color-glass condensate, quark–gluon plasma, Rydberg matter, Rydberg polaron, photonic matter, and time crystal but whose properties …

What can negative mass do?

Negative masses are a hypothetical form of matter that would have a type of negative gravity – repelling all other material around them. Unlike familiar positive mass matter, if a negative mass was pushed, it would accelerate towards you rather than away from you.

How do you get a negative mass?

To create the conditions for negative mass, the researchers used lasers to trap the rubidium atoms and to kick them back and forth, changing the way they spin. When the atoms were released from the laser trap, they expanded, with some displaying negative mass.