Structure conjecture for sRC quotients of smooth klt pairs
Structure conjecture for sRC quotients of smooth klt pairs
Let be a klt pair with smooth and nef. An orbifold morphism is a morphism of orbifold pairs. The pair is sRC if its slope rationally connected quotient has the vanishing property described in the preceding definition. An orbifold fiber is a fiber of such a morphism equipped with its induced orbifold structure.
Structure conjecture for sRC quotients. There exists an orbifold morphism
with the following properties:
- is a klt pair, is smooth, and
- General orbifold fibers are sRC.
- The fibration is locally trivial with respect to pairs: for any small open set ,
over , where is a general fiber of .
This conjecture seeks a structure theorem for sRC quotients analogous to the known structure theorem for the sRC quotient of an lc pair. It predicts that, under nefness of the anti-canonical divisor, the quotient has a smooth klt base with numerically trivial log canonical class, sRC general fibers, and local product structure; its resolution status is not specified in the source.
Sources & referencesView supporting material
Primary source
Frédéric Campana, Junyan Cao and Shin-ichi Matsumura, “Projective klt pairs with nef anti-canonical divisor”, arXiv:1910.06471 (2019).
Progress summary
Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.
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