High-energy neutrino emission from tidal disruption event outflow-cloud interactions

Tidal disruption events (TDEs), characterized by their luminous transients and high-velocity outflows, have emerged as plausible sources of high-energy neutrinos contributing to the diffuse neutrino. In this study, we calculate the contribution of TDEs to the diffuse neutrino by employing the outflow-cloud model within the TDE framework. Our analysis indicates that the contribution of TDEs becomes negligible when the redshift Z exceeds 2. Employing a set of fiducial values, which includes outflow energy Eₖᵢₙ=10⁵¹ erg, a proton spectrum cutoff energy Ep,max=100 PeV, a volume TDE rate ${ ̇ {}}{N}=8×{}{10}^{{-}7} {Mpc}^{{-}3} {year}^{{-}1}$, covering fraction of clouds ${C}V=0.1$, energy conversion efficiency in the shock ${η}=0.1$, and a proton spectrum index ${{Γ}}={-}1.7$, we find that TDEs can account for approximately 80% of the contribution at energies around 0.3 PeV. Additionally, TDEs still contribute around 18% to the IceCube data below 0.1 PeV and the total contribution is ~24_-15⁺²%. In addition, we also discuss the potential influence of various parameter values on the results in detail. With the IceCube data, we impose constraints on the combination of the physical parameters, i.e., Cf= ̇ NEₖᵢₙCᵥη. Future observations or theoretical considerations would fix some physical parameters, which will help to constrain some individual parameters of TDEs.