Multi-messenger Constraint of Hubble Constant H₀ with Tidal Disruption Events

Tidal disruption events (TDEs), apart from producing luminous electromagnetic (EM) flares, can generate potentially detectable gravitational wave (GW) burst signals by future space-borne GW detectors. I propose a methodology to constrain the Hubble constant H₀ by incorporating the TDE parameters measured by EM observations (e.g., stellar mass, black hole (BH) mass and spin, and other orbital parameters) into the observed TDE GW waveforms. I argue that an accurate knowledge of the BH spin could help constrain the orbital inclination angle, hence alleviating the well-known distance-inclination degeneracy in GW waveform fitting. For individual TDEs, the precise redshift measurement of the host galaxies along with the luminosity distance D_L constrained by EM and GW signals would give a self-contained measurement of H₀ via Hubble's law, completely independent of any specific cosmological models.