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Intermediate-mass black holes (IMBHs) are the missing link betweenstellar-mass and supermassive black holes, widely believed to reside in atleast some dense star clusters, but not yet observed directly. Tidaldisruptions of white dwarfs (WDs) are luminous only for black holes lessmassive than $\sim 10^5\,M_{\odot}$, therefore providing a unique smoking gunthat could finally prove the existence of IMBHs beyond any reasonable doubt.Here, we investigate the tidal captures of WDs by IMBHs in dense star clusters,and estimate a typical rate of $\sim 1\,{\rm Myr}^{-1}$ for galactic nuclei and$\sim 0.01\,{\rm Myr}^{-1}$ for globular clusters. Following the capture, theWD inspirals onto the IMBH producing gravitational waves detectable out to$\sim100$ Mpc by LISA for $\sim 10^4\,M_{\odot}$ IMBHs. The subsequent tidalstripping/disruption of the WD can also release bright X-ray and gamma-rayemission with luminosities of at least $\gtrsim10^{40}\,\rm{erg\,s^{-1}}$,detectable by \textit{Chandra}, \textit{Swift}, and upcoming telescopes, suchas the \textit{Einstein Probe}.

On the Tidal Capture of White Dwarfs by Intermediate-mass Black Holes in Dense Stellar Environments