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The recent observation of the shadow of the supermassive black hole M87*,located at the centre of the M87 galaxy, by the Event Horizon Telescopecollaboration has opened up a new window to probe the strong gravity regime. Inthis letter, we explicitly demonstrate the consequences of this observation onbrane world black holes, characterized by existence of a negative tidal charge.Our results based on three observables associated with the shadow, namely,angular diameter, deviation from circularity and axis ratio reveal that theexistence of a negative tidal charge is more favoured, possibly marking adeviation from general relativity.

Silhouette of M87*: A new window to peek into the world of hidden dimensions