For a rotating Horndeski black hole, the hair parameter h shrinks and deforms the shadow, and EHT shadow sizes allow but do not uniquely confirm a non-zero h.
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Probing Horndeski Gravity via Kerr Black Hole: Insights from Thin Accretion Disks and Shadows with EHT Observations
For a rotating Horndeski black hole, the hair parameter h shrinks and deforms the shadow, and EHT shadow sizes allow but do not uniquely confirm a non-zero h.