8 papers
Hodge Loci and Complex Multiplication via Generalized Symmetries in Calabi-Yau sigma models
Roberta Angius, Roberto Volpato
We propose a sigma-model analogue of Hodge loci in the moduli space of geometric Calabi-Yau compactifications, characterized by the emergence of non-trivial rational Hodge endomorp…
The Art of Networking: Networks of Trivalent 10d Heterotic Junctions
Chiara Altavista, Edoardo Anastasi, Roberta Angius +2
We initiate the study of networks of 10d string theories connected by junctions implied by the cobordism conjecture. Focusing on the recently constructed junction of the three 10d…
The Art of Branching: Cobordism Junctions of 10d String Theories
Chiara Altavista, Edoardo Anastasi, Roberta Angius +1
We describe the explicit construction of configurations of several 10d string theories joining at a 9d junction, providing a dynamical realization of cobordisms between multiple 10…
Non-invertible defects from the Conway SCFT to K3 sigma models II: duality and Fibonacci defects
Roberta Angius, Stefano Giaccari, Sarah M. Harrison +1
We continue the study, initiated in [hep-th:2504.18619], of topological defect lines (TDLs) in the Conway module and K3 non-linear sigma models (NLSMs). In the cas…
Non-invertible defects from the Conway SCFT to K3 sigma models I: general results
Roberta Angius, Stefano Giaccari, Sarah M. Harrison +1
We initiate the study of supersymmetry-preserving topological defect lines (TDLs) in the Conway moonshine module . We show that the tensor category of such defects,…
Towards a classification of topological defects in sigma models
Roberta Angius, Stefano Giaccari
Given a surface, a supersymmetric non-linear K3 sigma model is the internal superconformal field theory (SCFT) in a six dimensional compactification of type IIA superstring on…