From the 1 of 5 linked papers with an AI index.
5 papers
Superdiffusion at the Galactic Centre
Pau Amaro Seoane, Kostas Tzanavaris, Reinhard Genzel +14
The paper models the orbital evolution of the S‑star cluster around the Milky Way’s central black hole using a superdiffusive, fractional transport framework that accounts for long…
The free boundary problem in general relativity
Kostas Tzanavaris, Latham Boyle, Neil Turok
We study the action principle for space-times whose boundary is singular. We suggest that it is natural to treat the singularity as a {\it free} boundary, where the variation is un…
Perfect fluids revisited: an action principle approach
Kostas Tzanavaris
We revisit the variational principle for relativistic perfect fluids in a manifestly covariant formulation based on differential forms, with particular attention to the boundary da…
Popcorn EMRIs: Transient Gravitational Wave Signals and Their Analysis in Schwartz Space
Pau Amaro Seoane, Kostas Tzanavaris
We investigate extreme-mass ratio inspirals (EMRIs) with orbital periods exceeding the observational timescale of mHz gravitational wave observatories. In their early, highly eccen…
Black Mirrors: CPT-Symmetric Alternatives to Black Holes
Kostas Tzanavaris, Latham Boyle, Neil Turok
Einstein's equations imply that a gravitationally collapsed object forms an event horizon. But what lies on the other side of this horizon? In this paper, we question the reality o…