Intersecting End of the World Branes

TL;DR

This paper constructs explicit solutions for intersecting end of the world branes in theories with multiple scalars, providing insights into the swampland constraints and the structure of moduli space boundaries.

Contribution

It introduces a new class of intersecting ETW brane solutions that allow simultaneous probing of multiple infinite field space limits within a single spacetime.

Findings

Solutions include intersections of bubbles of nothing in toroidal compactifications

Generalizations to compactifications on products of spheres

Inclusion of flux dressings and charged objects at ETW branes

Abstract

Dynamical cobordisms implement the swampland cobordism conjecture in the framework of effective field theory, realizing codimension 1 end of the world (ETW) branes as singularities at finite spacetime distance at which scalars diverge to infinite field space distance. ETW brane solutions provide a useful probe of infinity in moduli field spaces and the associated swampland constraints, such as the distance conjecture. We construct explicit solutions describing intersecting ETW branes in theories with multiple scalars and general potentials, so that different infinite field space limits coexist in the same spacetime, and can be simultaneously probed by paths approaching the ETW brane intersection. Our class of solutions includes physically interesting examples, such as intersections of Witten s bubbles of nothing in toroidal compactifications, generalizations in compactifications on products of spheres, and possible flux dressings thereof (hence including charged objects at the ETW branes). From the cobordism perspective, the intersections can be regarded as describing the end of the world for end of the world branes, or as boundary domain walls interpolating between different ETW brane boundary conditions for the same bulk theory.