Self Gravitating Incompressible Fluid in Two Dimensions

TL;DR

This paper develops simplified models for the steady states and evolution of two-dimensional, self-gravitating, incompressible, rotating gases, providing analytical and numerical solutions relevant to astrophysics.

Contribution

It introduces two reduced models for 2D self-gravitating fluids, simplifying complex PDEs to facilitate analysis of their steady and dynamic behaviors.

Findings

Analytical solutions for steady states.

Numerical simulations of time evolution.

Potential applications in astrophysics.

Abstract

In this paper we develop two models for the steady states and evolution of two dimensional isothermal self gravitating and rotating incompressible gas which are based on the hydrodynamic equations for stratified fluid. The first model is for the steady states of the gas while the second addresses the time evolution of the gas subject to some constraints. These models reduce the initial five partial differential equations that govern this system to two for the steady state model and to three for the time dependent model. Analytical and numerical solutions of the model equations are used to study the structure of the resulting steady and time dependent states of the fluid with some possible astrophysical applications.