HWF Analysis of TRN Black Holes

Abstract

We extend the horizon wave-function (HWF) formalism to a spherically symmetric, charged, spinless quantum source in $\mathcal{D} + 1$ dimensional spacetime geometry and construct the HWFs associated with inner- as well as outer-horizons of the Tangherlini--Reissner--Nordström (TRN) black hole. The corresponding black hole formation probabilities, $P_{\rm BH}^{\pm}$, are also calculated and their sensitivities due to various source parameters including charge, mass, and $\mathcal{D}$ are analysed as well. Our analysis reveals that the ratio of inner- to outer-horizon probabilities, $P_{\rm BH}^{-}/P_{\rm BH}^{+}$, changes drastically from being unity as the source departs away from being in the extremal limit defined by $α$ ($\to 1$ for extremal case). Furthermore, black hole formation probabilities are found to be highly suppressed for higher values of $\mathcal{D}$, particularly for the source mass, $m \lesssim Λ_{\mathcal{D}}$, e.g., for $α= 0.5$, the ratio, $P_{\rm BH}^{+}(\mathcal{D} = 5)/P_{\rm BH}^{+}(\mathcal{D}=10)$ turn out to be approximately $2.95\times10^3$, $117$, and $3.35$ respectively for $m/Λ_{\mathcal{D}} = 0.5, 1$ and $2$, with $Λ_{\mathcal{D}}$ being the reduced gravity scale associated with $\mathcal{D}$ spatial-dimensions.