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Refined broccoli invariants

2018; American Mathematical Society; Volume: 28; Issue: 1 Linguagem: Inglês

10.1090/jag/705

1534-7486

Lothar Göttsche, Franziska Schroeter,

Algebraic Geometry and Number Theory

We introduce a tropical enumerative invariant depending on a variable y y which generalizes the tropical refined Severi degree. We show that this refined broccoli invariant is indeed independent of the point configuration, and that it specializes to a tropical descendant Gromov-Witten invariant for y = 1 y=1 and to the corresponding broccoli invariant for y = − 1 y=-1 . Furthermore, we define tropical refined descendant Gromov-Witten invariants which equal the corresponding refined broccoli invariants giving a new insight to the nature of broccoli invariants. We discuss various possible generalizations e.g. to refinements of bridge curves and Welschinger curves.