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Conformal anomalies in 6d 4-derivative theories: a heat-kernel analysis
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abstract
We compute the conformal anomalies for some higher-derivative (non-unitary) 6d Weyl invariant theories using the heat-kernel expansion in the background-field method. To this aim we obtain the general expression for the Seeley-DeWitt coefficient $b_6$ for four-derivative differential operators with background curved geometry and gauge fields, which was known only in flat space so far. We consider four-derivative scalars and abelian vectors as well as three-derivative fermions, confirming the result of the literature obtained via indirect methods. We generalise the vector case by including the curvature coupling $FF \mathrm{Weyl}$.
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Six-dimensional $\mathcal{N}=(2,0)$ Conformal Superspace
A new off-shell 6D N=(2,0) conformal superspace is constructed, and its unique Bach tensor superfield is derived up to overall scaling.
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