Morel's conjecture on rational points in the -homotopy category

Let FF be the base field, let XX be a smooth variety over FF, and write

for the MorelVoevodsky homotopy category of schemes over $F$. The set $X(F)$ consists of the $F$-rational points of $X$, and $(,X)$ denotes the morphisms from

to XX in this category. Define an equivalence relation on X(F)X(F) generated by elementary 1^1-homotopies, namely by pairs x,yx,y for which there exists a morphism h:A1Xh:\mathbf{A}^1\to X with h(0)=xh(0)=x and h(1)=yh(1)=y. Morel's conjecture. If XX is a smooth variety, the natural map

X(F)HomH(F)(SpecF,X)X(F)\to \operatorname{Hom}_{\mathcal{H}(F)}(\operatorname{Spec} F,X)

is surjective and identifies the right-hand side with the quotient of X(F)X(F) by the equivalence relation generated by

(xy)    h:A1Xh(0)=x and h(1)=y.(x\sim y)\iff \exists h:\mathbf{A}^1\to X\mid h(0)=x\text{ and }h(1)=y.

This conjecture describes morphisms from the point to the 1^1-homotopy category in terms of rational points modulo 1^1-homotopy. The supplied text gives no resolution status, so it remains open here.

Sources & referencesView supporting material

Primary source

Bruno Kahn and R. Sujatha, “Birational geometry and localisation of categories”, arXiv:0805.3753 (2014).

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