# Modelling quantum aspects of disruption of a white dwarf star by a black hole

## TL;DR

This paper models the quantum effects during the disruption of a white dwarf by a black hole, revealing quantum turbulence, fragmentation, and potential links to ultraluminous X-ray bursts and gamma-ray bursts.

## Contribution

It introduces a quantum hydrodynamic simulation approach to study white dwarf disruption, highlighting quantum turbulence and novel astrophysical phenomena.

## Key findings

- White dwarf mass is stripped during periastron passage.
- Quantum turbulence with vortices forms in the accretion disk.
- Possible explanation for ultraluminous X-ray bursts and gamma-ray bursts.

## Abstract

We study the final stages of the evolution of a binary system consisted of a black hole and a white dwarf star. We implement the quantum hydrodynamic equations and carry out numerical simulations. As a model of a white dwarf star, we consider a zero temperature droplet of attractively interacting degenerate atomic bosons and spin-polarized atomic fermions. Such mixtures are investigated experimentally nowadays. We find that the white dwarf star is stripped off its mass while passing the periastron. Due to nonlinear effects, the accretion disk originated from the white dwarf becomes fragmented and the onset of a quantum turbulence with giant quantized vortices present in the bosonic component of the accretion disk is observed. The binary system ends its life in a spectacular way, revealing quantum features underlying the white dwarf star's structure. We find a charged mass, falling onto a black hole, could be responsible for recently discovered ultraluminous X-ray bursts. The simulations show that the final passage of a white dwarf near a black hole can cause a gamma-ray burst.