  Black hole accretion is one of nature's most efficient energy extraction
processes. When gas falls in, a significant fraction of its gravitational
binding energy is either converted into radiation or flows outwards in the form
of black hole-driven jets and disk-driven winds. Recently, the Event Horizon
Telescope (EHT), an Earth-size sub-millimetre radio interferometer, captured
the first images of M87's black hole. These images were analysed and
interpreted using general-relativistic magnetohydrodynamics (GRMHD) models of
accretion disks with rotation axes aligned with the black hole spin axis.
However, since infalling gas is often insensitive to the black hole spin
direction, misalignment between accretion disk and black hole spin may be a
common occurrence in nature. In this work, we use the general-relativistic
radiative transfer (GRRT) code \texttt{BHOSS} to calculate the first synthetic
radio images of (highly) tilted disk/jet models generated by our
GPU-accelerated GRMHD code \texttt{HAMR}. While the tilt does not have a
noticeable effect on the system dynamics beyond a few tens of gravitational
radii from the black hole, the warping of the disk and jet can imprint
observable signatures in EHT images on smaller scales. Comparing the images
from our GRMHD models to the 43 GHz and 230 GHz EHT images of M87, we find that
M87 may feature a tilted disk/jet system. Further, tilted disks and jets
display significant time variability in the 230 GHz flux that can be further
tested by longer-duration EHT observations of M87.

Astrophysics of Galaxies;High Energy Astrophysical Phenomena;General Relativity and Quantum Cosmology;Computational Physics