Physicists in the United States said they could test the absorption of sound for the first time in a “perfect fluid.”
It’s not just remarkable technically. The plasma could be used to measure the viscosity and also the quantum friction of neutron stars as a blueprint for more complex ideal flows in the early universe.
Martin Zwierlein of the Massachusetts Institute of Technology (MIT) said It’s pretty difficult to hear a neutron star. But now you can imitate it into a laboratory using atoms, shake that atomic soup, hear it, and know how it sounds like a neutron star.”
“perfect flow” refers for physicists to a liquid that flows with the least pressure and/or viscosity possible under the regulations of quantic mechanics. It is rare, but in the nucleus of neutron stars and in the early Universe it is believed to exist.
In a paper published in Science journal, Zwierlein and MIT colleagues explain how a “perfect fluid” of this type has been formed and heard by the sound waves in the laboratory.
The recording is a result of a glissando of sound waves, sent by a group of elementary particle gas called fermions. Hearing pits are the precise frequencies at which the gas resonates like a plucked cord.
In order to test its acoustic diffusion, how rapidly sound dissipates in the gas, which is connected to a material’s viscosity or internal friction, the researchers studied thousands of sound waves passing through this gas.
Surprisingly they state that they find that the sound diffusion of the fluid was so poor that a “quantum” of the friction, provided by the nature constant Planck, and the mass of individual fermions in the fluid is represented. They claim that they did not.
This simple importance confirms that the intensely interacting fermion gas is a perfect and all-encompassing fluid.
Although the gas and neutron star of Zwierlein are somewhat distinct, he predicts that the wavelengths of the resonating star will be comparable and audible – “if you could close your ear without being ripped off in gravity.”
The findings could be useful closer to Earth to explain how such materials can show a flawless, superconducting flow.
“This work is directly connected to material resistance,” says Zwierlein. “After you have found the lowest resistance you will have from gas, you can tell us what happens in the materials using electrons and how you can create materials that can flow perfectly. It’s amazing.”