Strong rational connectedness conjecture for smooth loci of log Del Pezzo surfaces

Work over an algebraically closed field of characteristic zero. A log Del Pezzo surface is a pair (X,Δ)(X,\Delta) consisting of a normal projective surface XX and an effective Q\mathbb Q-divisor Δ=aiΔi\Delta=\sum a_i\Delta_i, with 0<ai10<a_i\leq 1, having log terminal singularities, such that (KX+Δ)-(K_X+\Delta) is ample. The smooth locus is XsmX^{sm}.

Strong rational connectedness conjecture. The smooth locus XsmX^{sm} of a log Del Pezzo surface (X,Δ)(X,\Delta) is strongly rationally connected.

This would extend the known rational connectedness of the smooth locus and would allow weak approximation to be proved for many log Del Pezzo surfaces. The conjecture is presented as unresolved in the source.

Sources & referencesView supporting material

Primary source

Brendan Hassett and Yuri Tschinkel, “Approximation at places of bad reduction”, arXiv:math/0605274 (2006).

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