Static and collapsing configurations supported by the spinor fluid

TL;DR

This paper investigates static and collapsing spherically symmetric configurations of a spinor fluid under gravity, revealing solutions that could lead to star-like objects and providing insights into gravitational collapse dynamics.

Contribution

It introduces a two-parametric family of static solutions for spinor fluid configurations and analyzes their collapse, linking these to potential star formation scenarios.

Findings

Found static regular solutions with mass and size determined by central density and spinor mass.

Estimated characteristics of gravitational collapse of spinor fluid systems.

Suggested collapse outcomes could serve as cores for star-like objects.

Abstract

We study a gravitating spherically symmetric nonrelativistic configuration consisting of a spinor fluid whose effective equation of state is derived from a consideration of a limiting system supported by a massive nonlinear spinor field. For such a configuration, we find a two-parametric family of static regular solutions describing compact objects whose masses and sizes are determined by the central density of the spinor fluid and the mass of the spinor field. Using the similarity method, we consider a gravitational collapse of an initially uniform system consisting of the spinor fluid. We estimate the general characteristics of the collapse and show that a resulting nonuniform distribution of the fluid occurs that may serve as a core for the creation of equilibrium starlike configurations.