Manin obstruction to strong approximation for homogeneous spaces

作者：Borovoi Mikhail^*; Demarche Cyril

来源：Commentarii Mathematici Helvetici, 2013, 88(1): 1-54.

DOI：10.4171/CMH/277

• Manin obstruction
• strong approximation
• Brauer group
• homogeneous spaces
• connected algebraic groups

For a homogeneous space X (not necessarily principal) of a connected algebraic group G (not necessarily linear) over a number field k, we prove a theorem of strong approximation for the adelic points of X in the Brauer-Manin set. Namely, for an adelic point x of X orthogonal to a certain subgroup (which may contain transcendental elements) of the Brauer group Br(X) of X with respect to the Manin pairing, we prove a strong approximation property for x away from a finite set S of places of k. Our result extends a result of Harari for torsors of semiabelian varieties and a result of Colliot-Thelene and Xu for homogeneous spaces of simply connected semisimple groups, and our proof uses those results.

• 出版日期2013