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After finding a solution for the Hayward regular black hole (HRBH) in massivegravity, we embed the (3+1)-dimensional HRBHs both in massless and in massivegravities into (5+2)- and (6+3)-dimensional Minkowski spacetimes, respectively.Here, massive gravity denotes that a graviton acquires a mass holographicallyby broken momentum conservation in the HRBH. The original HRBH has noholographically added gravitons, which we call massless. Making use of newlyfound embedding coordinates, we obtain desired Unruh temperatures and comparethem with the Hawking and local fiducial temperatures, showing that the Unruheffect for a uniformly accelerated observer in a higher dimensional flatspacetime is equal to the Hawking effect for a fiducial observer in a blackhole spacetime. We also obtain freely falling temperatures of the HRBHs inmassless and massive gravities seen by freely falling observers, which remainfinite even at the event horizons while becoming the Hawking temperatures inasymptotic infinity.

GEMS embeddings of Hayward regular black holes in massless and massive gravities