‘Negative mass’ created at Washington State University

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‘Negative mass’ created at Washington State University

Post by Cr6 on Sun Apr 23, 2017 11:03 pm

‘Negative mass’ created at Washington State University
April 10, 2017


Michael Forbes WSU physicsBy Eric Sorensen, WSU science writer

PULLMAN, Wash. – 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.

The phenomenon is rarely created in laboratory conditions and can be used to explore some of the more challenging concepts of the cosmos, said Michael Forbes, a WSU assistant professor of physics and astronomy and an affiliate assistant professor at the University of Washington. The research appears today in the journal Physical Review Letters, where it is featured as an “Editor’s Suggestion.”

Hypothetically, matter can have negative mass in the same sense that an electric charge can be either negative or positive. People rarely think in these terms, and our everyday world sees only the positive aspects of Isaac Newton’s Second Law of Motion, in which a force is equal to the mass of an object times its acceleration, or F=ma.

In other words, if you push an object, it will accelerate in the direction you’re pushing it. Mass will accelerate in the direction of the force.

“That’s what most things that we’re used to do,” said Forbes, hinting at the bizarreness to come. “With negative mass, if you push something, it accelerates toward you.”

Conditions for negative mass

He and his colleagues created the conditions for negative mass by cooling rubidium atoms to just a hair above absolute zero, creating what is known as a Bose-Einstein condensate. In this state, predicted by Satyendra Nath Bose and Albert Einstein, particles move extremely slowly and, following the principles of quantum mechanics, behave like waves. They also synchronize and move in unison as what is known as a superfluid, which flows without losing energy.

Led by Peter Engels, WSU professor of physics and astronomy, researchers on the sixth floor of Webster Hall created these conditions by using lasers to slow the particles, making them colder, and allowing hot, high energy particles to escape like steam, cooling the material further.

The lasers trapped the atoms as if they were in a bowl measuring less than a hundred microns across. At this point, the rubidium superfluid has regular mass. Breaking the bowl will allow the rubidium to rush out, expanding as the rubidium in the center pushes outward.

To create negative mass, the researchers applied a second set of lasers that kicked the atoms back and forth and changed the way they spin. Now when the rubidium rushes out fast enough, if behaves as if it has negative mass.

“Once you push, it accelerates backwards,” said Forbes, who acted as a theorist analyzing the system. “It looks like the rubidium hits an invisible wall.”

Avoiding underlying defects

The technique used by the WSU researchers avoids some of the underlying defects encountered in previous attempts to understand negative mass.

“What’s a first here is the exquisite control we have over the nature of this negative mass, without any other complications” said Forbes. Their research clarifies, in terms of negative mass, similar behavior seen in other systems.

This heightened control gives researchers a new tool to engineer experiments to study analogous physics in astrophysics, like neutron stars, and cosmological phenomena like black holes and dark energy, where experiments are impossible.

“It provides another environment to study a fundamental phenomenon that is very peculiar,” Forbes said.

Forbes’ colleagues on the Physical Review Letters paper include WSU research assistants Mohammad Khamehchi, Khalid Hossain and Maren Mossman, as well as Thomas Busch in Japan and Yongping Zhang in China and Japan. The work was supported in part by a WSU New Faculty Seed Grant and the National Science Foundation.

News media contact:
Michael Forbes, WSU assistant professor of physics and astronomy, (206) 280-9082, m.forbes@wsu.edu



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Re: ‘Negative mass’ created at Washington State University

Post by Nevyn on Sun Apr 23, 2017 11:39 pm

Yeah, I'm pretty sure they are misunderstanding something here. I don't know what that is but negative mass is an illogical concept. I keep thinking about the last stage of two magnets coming together when you get the snap. They are removing as much charge as possible (ultra cold) so when they release it, charge starts coming in and each atom fires up again and they all push each other away, like an explosion. That's my off-the-cuff answer at the moment, anyway.

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Re: ‘Negative mass’ created at Washington State University

Post by Jared Magneson on Mon May 22, 2017 9:24 pm

I dissected this article heavily on Facebook, and it's really simple. The fluid is not exhibiting negative mass, it's just moving in another direction.

“Once you push, it accelerates backwards,” said Forbes, who acted as a theorist analyzing the system. “It looks like the rubidium hits an invisible wall.”

An acceleration away isn't negative mass, it's just another vector. The mass may have a velocity away, making the numbers we assign that velocity negative relative to some other velocity/vector, but that doesn't mean the mass itself has gone below zero.

And how can something with negative mass "hit an invisible wall"? More virtual particle nonsense?

It's just another example of these mainstream types lacking a fundamental understanding of motion, mass, and just about everything else in physics at this point.

Jared Magneson

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