Abstract
We study how to couple a 6D superconformal field theory (SCFT) to gravity. In F-theory, the models in question are obtained working on the supersymmetric background $$ \mathbb{R} $$ 5,1 × B where B is the base of a compact elliptically fibered Calabi-Yau threefold in which two-cycles have contracted to zero size. When the base has orbifold singularities, we find that the anomaly polynomial of the 6D SCFTs can be understood purely in terms of the intersection theory of fractional divisors: the anomaly coefficient vectors are identified with elements of the orbifold homology. This also explains why in certain cases, the SCFT can appear to contribute a “fraction of a hypermultiplet” to the anomaly polynomial. Quantization of the lattice of string charges also predicts the existence of additional light states beyond those captured by such fractional divisors. This amounts to a refinement to the lattice of divisors in the resolved geometry. We illustrate these general considerations with explicit examples, focusing on the case of F-theory on an elliptic Calabi-Yau threefold with base $$ {\mathrm{\mathbb{P}}}^2/{\mathbb{Z}}_3 $$ .
Highlights
An important assumption in much of the literature on 6D supergravity theories is that the matter fields organize according to “conventional” supermultiplets
We study how to couple a 6D superconformal field theory (SCFT) to gravity
When the base has orbifold singularities, we find that the anomaly polynomial of the 6D SCFTs can be understood purely in terms of the intersection theory of fractional divisors: the anomaly coefficient vectors are identified with elements of the orbifold homology
Summary
We discuss some aspects of 6D supergravity theories for F-theory compactified on a smooth base Bsmth. A hallmark of chiral 6D theories is the presence of self-dual and anti-self-dual threeform field strengths, and the corresponding BPS lattice of strings. These field strengths come about about from reduction of the 10D gravity multiplet, as well as reduction of the RR five-form flux to six-dimensional vacua. We reach the tensorial Coulomb branch of the theory by giving vevs to the scalars in the tensor multiplets. This generates a tension for the strings. The invariant field strengths of these tensor fields are
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