The conjectural injectivity of pushforward on Chow groups for very general ample divisors

Let XX be a smooth projective variety, let DXD\subset X be a very general smooth ample divisor of sufficiently large degree, and let j:DXj:D\hookrightarrow X be the inclusion. Pushforward injectivity conjecture. The pushforward map on rational Chow groups

j:CHk(D)QCHk(X)Qj_*:CH_k(D)\otimes \mathbb{Q}\longrightarrow CH_k(X)\otimes \mathbb{Q}

is injective whenever k>0k>0. This is posed as the dual of the preceding Chow-theoretic Lefschetz questions and concerns the kernel of pushforward for positive-dimensional cycles. The source gives no evidence that the conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Kalyan Banerjee and Jaya NN Iyer, “On the kernel of the push-forward homomorphism between Chow groups”, arXiv:1504.07887 (2016).

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