Abstract
We compute the gravitational U(1) and the non-abelian SU(4) anomalies in pure N = 4 conformal supergravity. The former vanishes, the latter does not vanish. However, in coupling the N = 4 Yang-Mills matter to N = 4 conformal supergravity, the SU(4) axial anomaly vanishes when the gauge group has four generators. The U(1) axial anomaly then no longer vanishes. We conclude that pure N = 4 conformal supergravity is inconsistent, whereas the above coupling may be consistent.
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