# Generalized Flows around Neutron Stars

## TL;DR

This paper reviews theoretical models of accretion flows around neutron stars, discusses the application of the TCAF model with modifications, and presents simulation results supporting its use for various neutron star types.

## Contribution

It introduces how the Two-Component Advective Flow (TCAF) model can be adapted for neutron stars and supports this with simulation findings.

## Key findings

- TCAF can be applied to neutron stars with suitable modifications.
- Simulation results support the applicability of TCAF to different neutron star types.
- Future work can explore TCAF in magnetic and weakly magnetic neutron stars.

## Abstract

In this chapter, we present a brief and non-exhaustive review of the developments of theoretical models for accretion flows around neutron stars. A somewhat chronological summary of crucial observations and modelling of timing and spectral properties are given in sections 2 and 3. In section 4, we argue why and how the Two-Component Advective Flow (TCAF) solution can be applied to the cases of neutron stars when suitable modifications are made for the NSs. We showcase some of our findings from Monte Carlo and Smoothed Particle Hydrodynamic simulations which further strengthens the points raised in section 4. In summary, we remark on the possibility of future works using TCAF for both weakly magnetic and magnetic Neutron Stars.