Toral Affine Sieve Conjecture for hyperbolic toral orbits

Let \gGL2(Q)\g\in\operatorname{GL}_2(\mathbb{Q}) be a hyperbolic matrix, that is, one having two distinct real eigenvalues; equivalently

tr(\g)24det(\g)>0.\operatorname{tr}(\g)^2-4\det(\g)>0.

Let \G=\g+:={\gn:n0}\G=\langle\g\rangle^+:=\{\g^n:n\ge0\} be the semigroup generated by \g\g, and suppose that \bv0Q2{(0,0)}\bv_0\in\mathbb{Q}^2\setminus\{(0,0)\} is a nonzero vector such that the orbit \cO:=\G\bv0Z2\cO:=\G\cdot\bv_0\subset\mathbb{Z}^2 is integral and infinite. Toral Affine Sieve Conjecture. Then

lim inf(x,y)\cO\gW(xy)loglogxy\gb20.373365.\liminf_{(x,y)\in\cO}\frac{\gW(xy)}{\log\log|xy|}\ge \gb_2\approx0.373365.

The conjecture predicts a lower bound for the number of prime factors along an infinite toral orbit, in the spirit of the affine sieve. Its status is not resolved in the supplied source context.

Sources & referencesView supporting material

Primary source

Alex Kontorovich and Jeff Lagarias, “On Toric Orbits in the Affine Sieve”, arXiv:1808.03235 (2018).

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