The Bloch-type motive decomposition conjecture for finite quotients

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Let XX be a smooth projective variety over a field kk of characteristic 00, and let GG be a finite group acting on XX. Suppose that

Hi(X,OX)=Hi(X,OX)GH^i(X,\mathcal{O}_{X})=H^i(X,\mathcal{O}_{X})^G

for all ii. Write (X,π)(X,\pi) for the motive associated with the quotient map π:X→X/G\pi:X\to X/G, and let YY be a resolution of singularities of X/GX/G. Then there exist effective motives NN and N′N' such that

X≅(X,π)⊕N′⊗Q(−1),Y≅(X,π)⊕N⊗Q(−1).X\cong (X,\pi)\oplus N'\otimes\mathbb{Q}(-1),\qquad Y\cong (X,\pi)\oplus N\otimes\mathbb{Q}(-1).

This is the motive decomposition predicted by the Bloch conjectures for zero-cycles on finite quotients; the supplied text does not indicate whether it has been proved or disproved in this generality.

References

Primary source

Andre Chatzistamatiou, “First coniveau notch of the Dwork family and its mirror”, arXiv:0804.2472 (2009).

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