# Weight structures and weights' on the hearts of $t$-structures

## Mikhail V. Bondarko

We define and study transversal weight and $t$-structures (for triangulated categories); if a weight structure is transversal to a $t$-one, then it defines certain weights' for its heart. Our results axiomatize and describe in detail the relations between the Chow weight structure ${w_{\textit{Chow}}}$ for Voevodsky's motives (introduced in a preceding paper), the (conjectural) motivic $t$-structure, and the conjectural weight filtration for them. This picture becomes non-conjectural when restricted to the derived categories of Deligne's $1$-motives (over a smooth base) and of Artin-Tate motives over number fields. In particular, we prove that the weights' for Voevodsky's motives (that are given by ${w_{\textit{Chow}}}$) are compatible with those for $1$-motives (that were classically' defined using a quite distinct method); this result is new. Weight structures transversal to the canonical $t$-structures also exist for the Beilinson's $D^b_{{\tilde{H}}_p}$ (the derived category of graded polarizable mixed Hodge complexes) and for the derived category of (Saito's) mixed Hodge modules.

We also study weight filtrations for the heart of $t$ and (the degeneration of) weight spectral sequences. The corresponding relation between $t$ and $w$ is strictly weaker than transversality; yet it is easier to check, and we still obtain a certain filtration for (objects of) the heart of $t$ that is strictly respected by morphisms.

In a succeeding paper we apply the results obtained in order to reduce the existence of Beilinson's mixed motivic sheaves (over a base scheme $S$) and `weights' for them to (certain) standard motivic conjectures over a universal domain $K$.

Homology, Homotopy and Applications, Vol. 14 (2012), No. 1, pp.239-261.

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