13/2 ways of counting curves

Details 13/2 ways of counting curves 13/2 ways of counting curves

2011-11-07

arxiv.org/abs/1111.1552v2

Mathematics

Algebraic Geometry

Small corrections. 50 pages, 4 figures. To appear in proceedings of "School on Moduli Spaces", Isaac Newton Institute, Cambrid

Scientific paper

In the past 20 years, compactifications of the families of curves in algebraic varieties X have been studied via stable maps, Hilbert schemes, stable pairs, unramified maps, and stable quotients. Each path leads to a different enumeration of curves. A common thread is the use of a 2-term deformation/obstruction theory to define a virtual fundamental class. The richest geometry occurs when X is a nonsingular projective variety of dimension 3. We survey here the 13/2 principal ways to count curves with special attention to the 3-fold case. The different theories are linked by a web of conjectural relationships which we highlight. Our goal is to provide a guide for graduate students looking for an elementary route into the subject.

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