Generalized Zariski component conjecture for branch-curve strata

For ue3 ue 3, define the numerical invariants

d(u)=u(u1),d( u)= u( u-1), c(u)=u(u1)(u2),c( u)= u( u-1)( u-2), n(u)=12ν(ν1)(ν2)(ν3).n( u)=\frac{1}{2}\nu(\nu-1)(\nu-2)(\nu-3).

Let V(d,c,n)V(d,c,n) be the space of irreducible plane curves of degree dd with cc cusps and nn nodes as their only singularities, and let B(d,c,n)B(d,c,n) be the family of branch curves of generic projections of smooth surfaces of degree u u in cmathbbP3cmathbb{P}^3. Generalized Zariski component conjecture. For each u3 u\ge 3, the variety V(d(u),c(u),n(u))V(d( u),c( u),n( u)) contains a component disjoint from B(d(u),c(u),n(u))B(d( u),c( u),n( u)). This generalizes the known degree-33 case, where V(6,6,0)V(6,6,0) has a component disjoint from B(6,6,0)B(6,6,0), and predicts such non-branch components in every degree u3 u\ge 3.

Sources & referencesView supporting material

Primary source

Michael Friedman and Maxim Leyenson, “On ramified covers of the projective plane I: Segre's theory and classification in small degrees, with Appendix by Eugenii Shustin”, arXiv:0903.3359 (2010).

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