Weights and t-structures: in general triangulated categories, for 1-motives, mixed motives, and for mixed Hodge complexes and modules

Details Weights and t-structures: in general triangulated categories, for 1-motives, mixed motives, and for mixed Hodge complexes and modules Weights and t-structures: in general triangulated categories, for 1-motives, mixed motives, and for mixed Hodge complexes and modules

2010-11-15

arxiv.org/abs/1011.3507v4

Mathematics

Algebraic Geometry

'Signs of weights' reversed: this new convention is compatible with the 'classical' one for Hodge complexes and perverse sheav

Scientific paper

We study certain 'weights' for triangulated categories endowed with $t$-structures. Our results axiomatize and describe in detail the relations between the Chow weight structure (introduced in a preceding paper), the (conjectural) motivic t-structure for Voevodsky's motives, and the conjectural weight filtration for them. This picture becomes non-conjectural when restricted to the derived categories of 1-motives (over a smooth base) and of Artin-Tate motives over number fields; other examples include Beilinson's derived category of graded polarizable mixed Hodge complexes and Saito's derived category of mixed Hodge modules. We also study weight filtrations for the heart of $t$ and (the degeneration of) weight spectral sequences. In a subsequent paper we apply the results obtained in order to prove that (certain) 'standard' conjectures imply the existence of Beilinson's categories of mixed motivic sheaves endowed with weight filtrations.

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