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for questions about motives in algebraic geometry, including constructions of categories of motives and motivic sheaves, and aspects of the standard conjectures.

25 votes
2 answers
3k views

Most significant results in motivic integration theory?

I am thinking about reading a course on motivic integration. I have already read certain introductions to the subject; yet I am not sure that they mention all the significant parts of the theory. So, …
Mikhail Bondarko's user avatar
22 votes

Voevodsky's counterexample to the existence of a motivic t-structure

triangulated subcategory of Artin's motives (generated by motives of varieties of dimension $0$). … Hanamura considers his own category of motives; yet I proved that it is (anti)-equivalent to Voevodsky's motives. 2. There is also the category of Nori's motives. …
Mikhail Bondarko's user avatar
17 votes
Accepted

Voevodsky's Triangulated Categories of Motives and their Relationships

Firstly, one can hardly hope to have a "reasonable" motivic $t$-structure for motives with integral coefficients. Furthermore, motives with transfers(! … Now let's consider motives with integral coefficients. …
Mikhail Bondarko's user avatar
15 votes
Accepted

Is the Hodge Conjecture an $\mathbb{A}^1$-homotopy invariant?

If the varieties are $\mathbb{A}^1$-homotopy equivalent, then their Voevodsky motives are isomorphic also (since there is a connecting functor making the obvious diagram commutative). … For this purpose one may recall that Chow motives embed into Voevodsky one and note that both the cycle classes and the Hodge classes are determined by Chow motives of the corresponding varieties. …
Mikhail Bondarko's user avatar
14 votes
1 answer
743 views

Can there exist Chow motives/motivic cohomology for compact Kähler manifolds?

In particular, could there exist some 'Chow motives for compact Kähler manifolds'? …
Mikhail Bondarko's user avatar
14 votes
1 answer
1k views

Are two conjectural descriptions of the motivic t-structure (via cohomology and via affine v...

I know of two conjectural descriptions of the motivic $t$-structure for Voevodsky's motives. … Mixed motives and algebraic cycles, III// Math. Res. …
Mikhail Bondarko's user avatar
14 votes
1 answer
1k views

Motivic cohomology vs. K-theory for singular varieties

Here for motivic cohomology I would like to take $Hom_{DM}(M(X),\mathbb{Z}(p)[q]$; $DM$ is the category of Voevodsky's motives, and $M(X)$ is the motif of $X$ (I don't want to take the motif with compact …
Mikhail Bondarko's user avatar
13 votes
1 answer
587 views

Is there a yoga of effectivity for motives and their realizations?

Inside the 'usual' categories of motives (Chow, Voevodsky ones) there are the categories of effective motives. … Similarly, there are effective Hodge structures; they seem to be closely related with effective motives. …
Mikhail Bondarko's user avatar
11 votes
2 answers
1k views

The vanishing of $MGL^{2n+i,n}(X)$; do spectra of smooth projective varieties generate $SH_{...

I have two questions related to the stable motivic homotopy categories of Morel-Voevodsky. The first is probably simple; I wonder what is known on the second one. For the algebraic cobordism theory …
Mikhail Bondarko's user avatar
10 votes

Understanding the definition of the Lefschetz (pure effective) motive

The basic property of the Lefschetz motif (in this aspect) is the Cancellation Theorem: $Hom(X,Y)\cong Hom(X\otimes L,Y\otimes L)$ for any effective motives X and Y. … If it does, then its image in the ('usual') Chow motives is invertible (with respect to the tensor product). …
Mikhail Bondarko's user avatar
10 votes

On Grothendieck's idea on his Standard Conjecture B

In the paper Smirnov, Oleg N., Graded associative algebras and Grothendieck standard conjectures// Invent. Math. 128 (1997), no. 1, 201–206 it is proved that Standard Conjecture D (numerical equivalen …
Mikhail Bondarko's user avatar
9 votes

What exactly do the standard conjectures in characteristic zero refer to?

Any characteristic zero field is an inductive limit of fields that can be embedded into complex numbers (i.e., those of characteristic 0 and of cardinality at most continuum). Hence the assumption t …
Mikhail Bondarko's user avatar
9 votes
0 answers
273 views

Which field extensions do not affect Chow groups?

Let $X$ be a (say, smooth projective) variety over a field $k$. For which $K$ it is known that the ("ordinary", that is, not higher) Chow groups of $X$ map onto that of $X_K$ bijectively? This stateme …
Mikhail Bondarko's user avatar
8 votes
Accepted

Motivic L-function vs motivic zeta function

The idea is to rewrite the $L$-function as the sum of $\sharp [Sym^nM](F_p)t^n$; here "the number of $F_p$-points" of a motif is a natural homomorphism from the Grothendieck group of motives to abelian …
Mikhail Bondarko's user avatar
8 votes
1 answer
722 views

The conjectural relation between mixed motivic sheaves and the perverse t-structure.

As far as I remember, there 'should exist' an exact etale realization functor from the category of mixed motivic sheaves (over a base scheme $S$) to the category of perverse $l$-adic sheaves over $S$. …
Mikhail Bondarko's user avatar

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