“…The oscillation time can be estimated as τ osc ∼ π/ω F,B ∼ 2π(Θ B /Γ B ) 1/2 /m D , so, it decreases with increasing m D . As was observed in [63,43], the differenceω F,B − ω F,B = N c B/(4Θ F,B ) coincides, to the leading order in N c , with the expression obtained in the collective coordinate approach [61,60], see Appendix. At large m D using (21) for the difference ω F,1 − ω F,B we obtain (N c = 3):…”