From the 1 of 16 linked papers with an AI index.
6 citations · 14 across the 8 of their papers we have counts for
16 papers
Formation of extremal regular black holes
Johanna Borissova
Static and slowly evolving regular black holes with a non-extremal inner horizon are generally expected to suffer from mass inflation. Here we consider the scenario of asymptotic g…
Modified Friedmann equations and non-singular cosmologies in non-polynomial quasi-topological gravities
Johanna Borissova, João Magueijo
The paper studies four‑dimensional non‑polynomial quasi‑topological gravity, derives modified Friedmann equations, and demonstrates that such theories can yield cosmological models…
All generalised dilaton theories from gravities
Johanna Borissova
We demonstrate that generic two-dimensional Horndeski theories can arise from the reduction of pure gravities in dimensions, and therefore generic onshell configurations…
Null geodesic defocusing in dynamical black-hole-to-white-hole transitions
Johanna Borissova, Stefano Liberati, Matt Visser
We investigate the defocusing of null geodesics in dynamical, non-singular black-hole-to-white-hole transitions. Working at the level of spacetime kinematics, and without assuming…
Regular black holes from pure gravity in four dimensions
Johanna Borissova, Raúl Carballo-Rubio
We derive static spherically symmetric regular black holes as vacuum solutions to purely gravitational theories in four dimensions. To that end, we construct four-dimensional non-p…
Effective geometrodynamics for renormalization-group improved black-hole spacetimes in spherical symmetry
Johanna Borissova, Raúl Carballo-Rubio
We consider the spherically reduced Einstein-Hilbert action, Einstein field equations and Schwarzschild spacetime modified by a renormalization-group (RG) scale-dependent gravitati…