arXiv subjects

Héctor Parra de Freitas

Publications and source records attributed to Héctor Parra de Freitas.

3 recordsLinked to original sources

arXiv2025

Symmetries and dualities in non-supersymmetric CHL strings

We chart the classical moduli space of heterotic strings with broken supersymmetry a la Scherk-Schwarz and gauge group rank reduced by 8 in eight dimensions. This space consists of four connected components, each with its own characteristic spectrum and T-duality group. Three of these components uplift to nine dimensions and can be described as Coxeter polyhedra, allowing an exact characterization of their maximal symmetry enhancements and decompactification limits. We determine the maximal enhancements in the eight dimensional theories using lattice based algorithms in the bosonic formulation, and perform an indepth analysis of their massless spectra. Finally we argue that one component has a supersymmetric $\mathcal{N} = 1$ sector described by BPS objects at strong coupling in a non-supersymmetric version of the type IIB string on $T^2/\mathbb{Z}_2$ with one $O7^+$-plane.

hep-th↗

arXiv2023

Tadpoles and Gauge Symmetries

The tadpole conjecture proposes that complex structure moduli stabilisation by fluxes that have low tadpole charge can be realised only at special points in moduli space, leading generically to (large) gauge symmetries. Here we provide an exhaustive survey of the gauge symmetries arising in F-theory flux compactifications on products of attractive $\mbox{K3}$ surfaces, with complex structure moduli fully stabilised. We compute the minimal rank of the left-over non-abelian gauge group for all flux configurations within the tadpole bound, finding that it is always non-zero. It decreases in a roughly linear fashion with the tadpole charge, reaching zero at charge 30. By working out possible gauge algebras for different values of the tadpole, we find that all simple ADE Lie algebras of rank $\le 18$ appear.

hep-th↗

arXiv2022

Freezing of Gauge Symmetries in the Heterotic String on $T^4$

We derive a map relating the gauge symmetry groups of heterotic strings on $T^4$ to other components of the moduli space with rank reduction. This generalizes the results for $T^2$ and $T^3$ which mirror the singularity freezing mechanism of K3 surfaces in F and M-theory, respectively. The novel feature in six dimensions is that the map explicitly involves the topology of the gauge groups, in particular acting only on non-simply-connected ones. This relation is equivalent to that of connected components of the moduli space of flat $G$-bundles over $T^2$ with $G$ non-simply-connected. These results are verified with a reasonably exhaustive list of gauge groups obtained with a moduli space exploration algorithm.

hep-th↗