Statistics of Limit Root Bundles Relevant for Exact Matter Spectra of F-Theory MSSMs

Abstract

In the largest, currently known, class of one Quadrillion globally consistent F-theory Standard Models with gauge coupling unification and no chiral exotics, the vector-like spectra are counted by cohomologies of root bundles. In this work, we apply a previously proposed method to identify toric base 3-folds, which are promising to establish F-theory Standard Models with exactly three quark-doublets and no vector-like exotics in this representation. The base spaces in question are obtained from triangulations of 708 polytopes. By studying root bundles on the quark doublet curve $C_{(3,2{)}_{1/6}}$ and employing well-known results about desingularizations of toric K3-surfaces, we derive a \emph{triangulation independent lower bound} ${\check{N}}_P^{(3)}$ for the number $N_P^{(3)}$ of root bundles on $C_{(3,2{)}_{1/6}}$ with exactly three sections. The ratio ${\check{N}}_P^{(3)}/N_P$, where $N_P$ is the total number of roots on $C_{(3,2{)}_{1/6}}$, is largest for base spaces associated with triangulations of the 8-th 3-dimensional polytope ${\Delta }_8^{\circ }$ in the Kreuzer-Skarke list. For each of these $\mathcal{O}(10^{15})$ 3-folds, we expect that many root bundles on $C_{(3,2{)}_{1/6}}$ are induced from F-theory gauge potentials and that at least every 3000th root on $C_{(3,2{)}_{1/6}}$ has exactly three global sections and thus no exotic vector-like quark-doublet modes.

arXiv comment6 pages, 5 figures and 2 tables

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