Speaker
Description
Observations of neutron stars have revealed a rapid changing in rotation velocity, known as a “Glitch” phenomenon. The glitching mechanism is thought to be related to neutron superfluidity inside neutron stars. In the inner crust region, neutrons are $^1S_0$ superfluid. While in the outer core, they behave as $^3P_2$ superfluid, which may form half-Integer vortices [1]. Vortices in different regions connect with each other, and this can form a "network" of vortices consisting of a large number of vortices. This "vortex network" could be the key mechanism to explain the glitch phenomenon [2]. However, the microscopic structure of how these vortices connect across the inner crust and outer core boundary has not yet been investigated.
In this presentation, we describe the microscopic structure of neutron $^3P_2$ superfluid in the outer core of a neutron star using the Gross-Pitaevskii equation (GPE) and explain the shape of the neutron quantum vortex. Furthermore, we analyze how $^3P_2$ vortices in the outer core connect to $^1S_0$ vortices in the inner crust. Quantitatively evaluate the magnitude of the interaction between the vortices of the two regions.
[1] M.Kobayashi, M.Nitta, PRC 105, 035807 (2022)
[2] G. Marmorini, S. Yasui, M. Nitta, Scientific Reports, 14:7857 (2024)