Scientists have made a major breakthrough in understanding neutron star failures through ultracold supersolid experiments. This research links quantum mechanics and astrophysics, revealing new details about the internal dynamics of neutron stars and opening up new ways to simulate stellar phenomena.
Neutron stars have fascinated and baffled scientists since their signature was first detected in 1967. Known for its periodic flashes and rapid rotation, neutron stars are among the densest objects in the universe. They are as massive as the sun, but are compressed into a sphere with a diameter of only about 20 kilometers. These stellar objects exhibit a peculiar behavior known as "catastrophe," in which the star suddenly accelerates its rotation.
This phenomenon suggests that neutron stars may be partially superfluid. In a superfluid, rotation is characterized by countless tiny vortices, each carrying a portion of angular momentum. The malfunction occurs when these vortices escape from the star's inner shell into its solid outer shell, increasing the star's rotational speed.
A key element of the research lies in the concept of a "supersolid" - a state that exhibits both crystalline and superfluid properties - which is predicted to be an essential component of neutron star failures. Quantized vortices "nest" in the supersolid until they collectively escape and are thus absorbed by the star's outer shell, accelerating the star's rotation. Recently, supersolid phases have been realized in experiments with ultracold dipole atoms, providing a unique opportunity to simulate conditions inside neutron stars.
Recent studies by researchers at the University of Innsbruck and the Austrian Academy of Sciences, as well as the Gran Sasso National Laboratory and the Gran Sasso Scientific Institute in Italy, have shown that faults can occur in ultracold supersolids that can serve as versatile analogs of the interior of neutron stars. This groundbreaking approach allows the scintillation mechanism to be explored in detail, including its dependence on the mass of the supersolid.
First author Elena Poli said: "Our study establishes a strong link between quantum mechanics and astrophysics, providing a new perspective on the internal nature of neutron stars. Mutations provide valuable insights into the internal structure and dynamics of neutron stars. By studying these events, scientists can learn more about the properties of matter under extreme conditions."
Francesca Ferlaino emphasizes: "This study demonstrates a new approach to gain insight into the behavior of neutron stars and opens new avenues for quantum simulations of stellar objects from low-energy Earth laboratories."
The research was published in Physical Review Letters and was funded by the Austrian Science Fund FWF and the European Research Council ERC, among others.
Compiled source: ScitechDaily