Variability in MAXI J1820+070

MAXI J1820+070 is a recently discovered X-ray binary with the compact object as a black hole. The brightness of the source triggered multiwavelength campaigns of this source from different observatories. Here we analyze the power density spectra obtained from high cadence observations of the source in the hard state using NICER. The evolution of the characteristic frequencies is obtained by modelling the PDS. The correlation of the characteristic frequencies observed has been interpreted as variability occurring at a particular radius and exhibiting different relativistic precessional frequencies. The observed low scatter in the fractional r.m.s. at high frequencies (5-20 Hz) indicates that the variability at higher frequencies is largely independent of the mass accretion rate. The fractional r.m.s. at these frequencies (and equivalently excess variance) for multiple AGNs have been observed to scale inversely with the BH mass while being independent of the mass accretion rate. We assess the applicability of the scaling relation to this stellar-mass black hole.