Physicists Create Fluid with ‘Negative Mass’

An general group of physicists from a United States, Japan, and China has combined a liquid with disastrous mass, that is accurately what it sounds like. A paper describing a investigate is published by a biography Physical Review Letters.

Khamehchi et al combined a liquid with disastrous effective mass. Image credit: Gerhard Boegner.

Khamehchi et al combined a liquid with disastrous effective mass. Image credit: Gerhard Boegner.

Hypothetically, matter can have disastrous mass in a same clarity that an electric assign can be possibly disastrous or positive.

People frequency consider in these terms, and a bland universe sees usually a certain aspects of Isaac Newton’s Second Law of Motion, in that a force is equal to a mass of an intent times a acceleration.

In other words, if we pull an object, it will accelerate in a instruction you’re pulling it. Mass will accelerate in a instruction of a force.

“That’s what many things that we’re used to do. With disastrous mass, if we pull something, it accelerates toward you,” explained lead co-author Dr. Michael McNeil Forbes, a physicist during Washington State University in Pullman and a University of Washington in Seattle.

Dr. Forbes and his co-authors, from Washington State University, OIST Graduate University in Japan, and Shanghai University in China, combined a conditions for disastrous mass by cooling rubidium atoms to roughly comprehensive 0 (minus 459.67 degrees Fahrenheit, or reduction 273.15 degrees Celsius), formulating what is famous as a Bose-Einstein condensate.

In this state of matter, particles pierce intensely solemnly and, following a beliefs of quantum mechanics, act like waves.

They also synchronize and pierce in unanimity as what is famous as a superfluid, that flows but losing energy.

The group combined these conditions by regulating lasers to delayed a particles, creation them colder, and permitting hot, high appetite particles to shun like steam, cooling a element further.

The lasers trapped a atoms as if they were in a play measuring reduction than a hundred microns across.

At this point, a rubidium superfluid has unchanging mass.

Breaking a play will concede a rubidium to rush out, expanding as a rubidium in a core pushes outward.

To emanate disastrous mass, Dr. Forbes and his colleagues practical a second set of lasers that kicked a atoms behind and onward and altered a approach they spin.

Now when a rubidium rushes out quick enough, if behaves as if it has disastrous mass.

“Once we push, it accelerates backwards. It looks like a rubidium hits an invisible wall,” Dr. Forbes said.

“The materialisation is frequency combined in laboratory conditions and can be used to try some of a some-more severe concepts of a cosmos,” he added.


M.A. Khamehchi et al. 2017. Negative-Mass Hydrodynamics in a Spin-Orbit–Coupled Bose-Einstein Condensate. Phys. Rev. Lett. 118 (15): 155301; doi: 10.1103/PhysRevLett.118.155301