Constraints on the Scale Parameter of Regular Black Hole in Asymptotically Safe Gravity from Extreme Mass Ratio Inspirals

Abstract

This paper evaluates the potential for constraining the quantum scale parameter $\xi$ of regular black hole within the asymptotically safe gravity framework using gravitational waves from extreme mass ratio inspirals (EMRIs). Since $\xi$ cannot be precisely determined from first principles, observational constraints become crucial. We employ the Augmented Analytical Kludge (AAK) method to calculate gravitational waveforms in the equatorial plane and systematically analyze the influence of different $\xi$ values on phase evolution. Comparison with the Schwarzschild case demonstrates that the corrective effects of $\xi$ accumulate in the phase over observation time, thereby providing distinguishable observational signatures. Through waveform mismatch analysis, our results indicate that the LISA detector can effectively detect the presence of $\xi$ at the $\sim 10^{-4}$ level for systems with a mass of $10^6{M}_{\odot }$. Further assessment using the Fisher information matrix (FIM) confirms a measurement precision of $\Delta \xi \approx 3.225\times 10^{-4}$, which significantly surpasses existing observational methods, providing quantitative observational evidence for asymptotically safe quantum gravity theory in the strong-field regime.

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