Aschenbach effect for spinning particles in Kerr–(A)dS spacetime

A non-monotonic behavior of the velocity gradient a test particle revolving around rapidly rotating black hole in locally non-rotating frame reference is known as Aschenbach effect. This effect can serve distinguishing signature holes, being potentially useful for measurements astrophysical spins. paper generalization our previous research to motion spinning particles with non-zero cosmological constant. We show that both particle's spin $s$ and constant $\Lambda$ modify critical value $a_c$, which be observed; $a_c$ increase or decrease depending on signs $\Lambda$. also found mimic given causing thus discrepancy $s$,