Abstract:We prove an explicit formula for the genus-one Fan-Jarvis-Ruan-Witten invariants associated with the quintic threefold, verifying the genus-one mirror conjecture of Huang, Klemm, and Quackenbush. The proof involves two steps. The first step uses localization on auxiliary moduli spaces to compare the usual Fan-Jarvis-Ruan-Witten invariants with a semisimple theory of twisted invariants. The second step uses the genus-one formula for semisimple cohomological field theories to compute the twisted invariants expli… Show more
We use tautological relations and axioms of Cohomological Field Theories to reconstruct all-genus Fan-Jarvis-Ruan-Witten invariants of a Fermat cubic Landau-Ginzburg model (x 3 + y 3 + z 3 : [C 3 /µ 3 ] → C) from genus-one primary invariants. The latter satisfy the Chazy equation by the Belorousski-Pandharipande relation. They can be completely determined by a single genus-one invariant, which can be computed by cosection localization.The Cayley transformation on quasi-modular forms gives rise to an all-genus Landau-Ginzburg/Calabi-Yau correspondence between this Fan-Jarvis-Ruan-Witten theory and the Gromov-Witten theory of the Fermat cubic elliptic curve. As a consequence, these Fan-Jarvis-Ruan-Witten invariants at any genus can be explicitly computed basing on the results on the Gromov-Witten invariants of the elliptic curve. Contents 1 Introduction 2 Belorousski-Pandharipande relation and Chazy equation
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