  We present the results regarding the analysis of the fast X-ray/infrared (IR)
variability of the black-hole transient MAXI J1535$-$571. The data studied in
this work consist of two strictly simultaneous observations performed with
XMM-Newton (X-rays: 0.7$-$10 keV), VLT/HAWK-I ($K_{\rm s}$ band, 2.2 $\mu$m)
and VLT/VISIR ($M$ and $PAH2$_$2$ bands, 4.85 and 11.88 $\mu$m respectively).
The cross-correlation function between the X-ray and near-IR light curves shows
a strong asymmetric anti-correlation dip at positive lags. We detect a near-IR
QPO (2.5 $\sigma$) at $2.07\pm0.09$ Hz simultaneously with an X-ray QPO at
approximately the same frequency ($f_0=2.25\pm0.05$). From the cross-spectral
analysis a lag consistent with zero was measured between the two oscillations.
We also measure a significant correlation between the average near-IR and
mid-IR fluxes during the second night, but find no correlation on short
timescales. We discuss these results in terms of the two main scenarios for
fast IR variability (hot inflow and jet powered by internal shocks). In both
cases, our preliminary modelling suggests the presence of a misalignment
between disk and jet.
