A new way to understand the second sound in Bose Einstein condensate

This fluid is referred to as a classic liquid sample for one of the main conditions of matter.

But when they cool helium it happens a few more degrees, it turns into a quantum liquid. This macroscopic view of quantum mechanics is a superfluid fluid that flows smoothly.

So what did you hear when you made an unfavorable decision to put your head into this liquid You will hear the same sound twice as surprising.

Helium first hear the sound:

Besides the normal sound of fluid, there is a second sound phenomenon that results from the quantum nature of this fluid. If someone says something while diving at helrahfluidniya helium first hear the sound first, and then you will get a second chance to hear when it comes as the second note, even though it is very mute. For supra-fluid helium clay, the second clay is much slower than the first clay at a cost of 25 m / s per 250 m / s, between 1 and 2 Kelvin.

While the second conventional audio theory succeeded in the growth of the Svrahfluidniya helium Bose-Einstein condensate atoms ultraholodnite has become a new challenge.

A team of scientists led by Ludwig Matthew of the University of Hamburg presented a new theory that captures the second tone in quantum fluids which was recently published in Physical Review A.

For svrahfluidniya second tone helium is slower than the first tone said co-author Vijay Singh but we are amazed that this is not always true that the second pulse can be faster. New theoretical approaches are needed to capture this. Modern problems require modern solutions as they say.

Feynman method:

We integrate the Integral Feynman method to extend the theory of svrahfluidite main author Ilias Seifie to describe conceptual progress. While integral trajectories brilliantly understood by Richard Feynman, because the number of trajectories form quantum mechanics this trajectory itself is classic.

We have changed the appearance of this trajectory Seifie continues in our integral path they contain information about quantum fluctuations. Imagine a pulba pool that extends from A to B as a visualization of poor orbits entering the Feynman Path integral.

Cross-sectional pastes are more or less round with constant diameters in over the length, but in the integral new path, the shape of the cross section can vary, it can take the form of an ellipse, imagine squeezing the pool noodles together.The physicist values this condition of quantum mechanics as pressure.

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