Colliot-Thélène's exactness conjecture for zero-cycles

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Let kk be a global field and let XX be a smooth, projective, geometrically integral variety over kk. Write CH0(X)CH_0(X) for the Chow group of zero-cycles modulo rational equivalence, and let CH0(X)∗CH_0(X)^* denote the degree-zero-compatible profinite completion appearing in the source. Exactness conjecture for zero-cycles. The complex

lim←⁡nCH0(X)/n⟶∏vlim←⁡nCH0(Xkv)∗/n⟶Hom(Br(X),Q/Z)\varprojlim_n CH_0(X)/n \longrightarrow \prod_v \varprojlim_n CH_0(X_{k_v})^*/n \longrightarrow {\rm Hom}({\rm Br}(X),\mathbb Q/\mathbb Z)

induced by the sum of the pairings of Br(X){\rm Br}(X) with the groups CH0(Xkv)CH_0(X_{k_v}), with values in Br(kv)⊂Q/Z{\rm Br}(k_v)\subset\mathbb Q/\mathbb Z, is exact. This conjecture encompasses the preceding conjecture on zero-cycles of degree one and concerns all smooth projective varieties without geometric restrictions. Its general status is open.

References

Primary source

Jean-Louis Colliot-Thélène, “Une liste de problèmes”, arXiv:2212.05791 (2022).

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