# Higher Tate traces of Chow motives

## TL;DR

This paper classifies Chow motives of projective homogeneous varieties for p-inner semi-simple algebraic groups using a new invariant called the Tate trace, and generalizes motivic equivalence through higher Tits p-indexes.

## Contribution

It introduces the Tate trace as a new motivic invariant and extends the classification of motives and motivic equivalence to broader classes of algebraic groups and varieties.

## Key findings

- Complete classification of Chow motives for p-inner semi-simple groups.
- Introduction of the Tate trace as a maximal pure Tate summand.
- Generalization of motivic equivalence via higher Tits p-indexes.

## Abstract

We establish the complete classification of Chow motives of projective homogeneous varieties for $p$-inner semi-simple algebraic groups, with coefficients in $\mathbb{Z}/p\mathbb{Z}$. Our results involve a new motivic invariant, the Tate trace of a motive, defined as a pure Tate summand of maximal rank. They apply more generally to objects of the Tate subcategory generated by upper motives of irreducible, geometrically split varieties satisfying the nilpotence principle. Using Chernousov-Gille-Merkurjev decompositions and their interpretation through Bialynicki-Birula-Hesselink-Iversen filtrations due to Brosnan, we then generalize the characterization of the motivic equivalence of inner semi-simple groups through the higher Tits $p$-indexes. We also define the motivic splitting pattern and the motivic splitting towers of a summand of the motive of a projective homogeneous variety, which correspond for quadrics to the classical splitting pattern and Knebusch tower of the underlying quadratic form.