Comparison of Quasinormal Modes of Black Holes in $f(\mathbb{T})$ and $f(\mathbb{Q})$ Gravity

TL;DR

This paper compares the quasinormal modes of black holes in $f( ext{Q})$ and $f( ext{T})$ gravity theories, highlighting differences due to non-metricity and providing data useful for testing gravity models with gravitational wave observations.

Contribution

It presents the first detailed comparison of black hole quasinormal modes in $f( ext{Q})$ and $f( ext{T})$ gravity, including numerical results and analysis.

Findings

Differences in quasinormal modes between $f( ext{Q})$ and $f( ext{T})$ gravity.

Parameter-dependent variations in frequencies.

Potential for gravitational wave data to distinguish gravity theories.

Abstract

We investigate the quasinormal modes of static and spherically symmetric black holes in vacuum within the framework of $f(\mathbb{Q}) = \mathbb{Q} + \alpha \mathbb{Q}^2$ gravity, and compare them with those in $f(\mathbb{T}) = \mathbb{T} + \alpha \mathbb{T}^2$ gravity. Based on the Symmetric Teleparallel Equivalent of General Relativity, we notice that the gravitational effects arise from non-metricity (the covariant derivative of metrics) in $f(\mathbb{Q})$ gravity rather than curvature in $f(R)$ or torsion in $f(\mathbb{T})$. Using the finite difference method and the sixth-order WKB method, we compute the quasinormal modes of massless scalar field and electromagnetic field perturbations. Tables of quasinormal frequencies for various parameter configurations are provided based on the sixth-order WKB method. Our findings reveal the differences in the quasinormal modes of black holes in $f(\mathbb{Q})$ gravity compared to those in $f(R)$ and $f(\mathbb{T})$ gravity. This variation demonstrates the impact of different parameter values, offering insights into the characteristics of $f(\mathbb{Q})$ gravity. These results provide the theoretical groundwork for assessing alternative gravities' viability through gravitational wave data, and aid probably in picking out the alternative gravity theory that best aligns with the empirical reality.