Speaker: Justin Feng (CENTRA, IST)
Title: Self-collision of a portal wormhole
Portals (also known as loop based thin shell wormholes or gates in the literature) are wormholes supported by a single loop of negative mass, negative tension cosmic string and have the property that the geometry is everywhere flat except at the cosmic string. In this talk, I describe the construction, topology, and smoothing of portals, and consider what happens if one attempts to collide the mouths of a portal, which naively resembles a topology changing process. For a simple anisotropic fluid, it is found that in general relativity, portal mouths do not experience an acceleration as they are brought together, and a curvature singularity forms in the limit that the separation distance vanishes.
Room: ZOOM videoconference (contact firstname.lastname@example.org for URL)