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We present the results regarding the analysis of the fast X-ray/infrared (IR)variability of the black-hole transient MAXI J1535$-$571. The data studied inthis work consist of two strictly simultaneous observations performed withXMM-Newton (X-rays: 0.7$-$10 keV), VLT/HAWK-I ($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 showsa strong asymmetric anti-correlation dip at positive lags. We detect a near-IRQPO (2.5 $\sigma$) at $2.07\pm0.09$ Hz simultaneously with an X-ray QPO atapproximately the same frequency ($f_0=2.25\pm0.05$). From the cross-spectralanalysis a lag consistent with zero was measured between the two oscillations.We also measure a significant correlation between the average near-IR andmid-IR fluxes during the second night, but find no correlation on shorttimescales. We discuss these results in terms of the two main scenarios forfast IR variability (hot inflow and jet powered by internal shocks). In bothcases, our preliminary modelling suggests the presence of a misalignmentbetween disk and jet.

Fast infrared variability from the black-hole candidate MAXI J1535$-$571 and tight constraints on the modelling