The survival and disruption of cold dark matter microhaloes: implications for direct and indirect detection experiments

摘要: If the dark matter particle is a neutralino, then first structures to form are cuspy cold (CDM) haloes collapsing after redshifts z ≈ 100 in mass range 10 −6 ‐10 −3 M � . We carry out detailed study of survival these microhaloes Galaxy as they experience tidal encounters with stars, molecular clouds, and other substructures. test validity analytic impulsive heating calculations using high-resolution N-body simulations. A major limitation estimates that mean energy inputs compared binding energies, instead actual lost from system. This criterion leads an overestimate stripped underestimate disruption time-scale, since CDM strongly bound their inner parts. show significant fraction material can be unbound by Galactic substructure stars; however, central regions remain relatively intact. Furthermore, near solar radius those which collapse significantly earlier than average will suffer very little mass-loss. Thus, we expect surviving microhaloes, smooth component narrow features phase space, may uncovered direct detection experiments, well numerous cores proper motions arcminutes per year, detected indirectly via annihilation into gamma-rays.