The Bloch-type motive decomposition conjecture for finite quotients

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:XX/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 NN' such that

X(X,π)NQ(1),Y(X,π)NQ(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.

Sources & referencesView supporting material

Primary source

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

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