2 papers
hep-th2026
The Lorentzian Geometry of Tunneling in Global de Sitter at Late Time
Thibaut Coudarchet, Ben Freivogel, Bjoern Hassfeld +1
It is widely believed that Coleman--De Luccia (CDL) instantons characterize tunneling transitions in a de Sitter multiverse. Their most naive interpretation uses analytic continuat…
hep-th2026
Calabi-Yau Orientifold Hypersurfaces and their F-theory Uplifts
Bjoern Hassfeld, Jakob Moritz
We present an algorithm that constructs Calabi-Yau threefold orientifolds and their -theory uplifts to elliptically-fibered Calabi-Yau fourfolds, embedded in toric varieties at…