Radial Oscillations and Dynamical Instability Analysis for Linear-Quadratic GUP-modified White Dwarfs

TL;DR

This paper investigates how linear-quadratic generalized uncertainty principle (LQGUP) modifications affect white dwarf properties, showing that LQGUP worsens gravitational collapse and induces instability at lower densities, with effects intensifying as the GUP parameter increases.

Contribution

The study introduces the impact of LQGUP on white dwarf mass-radius relations and dynamical stability, providing new insights into quantum gravity effects on stellar structures.

Findings

LQGUP decreases the mass and increases the radius of white dwarfs.

Instability occurs for all GUP parameter values, with lower central densities at higher lpha.

Higher lpha values lower the maximum stable mass of white dwarfs.

Abstract

A modification to the Heisenberg uncertainty principle is called the generalized uncertainty principle (GUP), which emerged due to the introduction of a minimum measurable length, common among phenomenological approaches to quantum gravity. One approach to GUP is called linear-quadratic GUP (LQGUP) which satisfies both the minimum measurable length and the maximum measurable momentum, resulting to an infinitesimal phase space volume proportional to the first-order momentum $(1 - \alpha p)^{-4} d^3x d^3p$, where $\alpha$ is the still-unestablished GUP parameter. In this study, we explore the mass-radius relations of white dwarfs whose equation of state has been modified by LQGUP, and provide them with radial perturbations to investigate the dynamical instability arising from the oscillations. We find from the mass-radius relations that the main effect of LQGUP is to worsen the gravitational collapse by decreasing the mass of the relatively massive white dwarfs (including their limiting mass, while increasing their limiting radius). This effect gets more prominent with larger values of $\alpha$. We then compare the results with available observational data. To further investigate the impact of the GUP parameter, a dynamical instability analysis of the white dwarf was conducted, and we find that instability sets in for all values of $\alpha$. With increasing $\alpha$, we also find that the central density at which instability occurs decreases, resulting to a lower maximum mass. This is in contrast to quadratic GUP, where instability only sets in below a critical value of the quadratic GUP parameter.