60 citations · 214 across the 23 of their papers we have counts for
8 papers · 1 filter
On mass inflation and late-time divergences in limiting-curvature regular black holes
Johanna Borissova
Mass inflation in non-extremal regular black holes with a non-linear dependence of the Misner-Sharp mass on the asymptotic mass may be a transient phenomenon followed by…
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…
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…
black hole thermodynamics in general quasi-topological gravity
Johanna Borissova
We present a unified framework for the discussion of black hole thermodynamics of -dimensional static black holes with spherical or compact hyperbolic horizon topology satisfyin…
Modified Friedmann equations and non-singular cosmologies in non-polynomial quasi-topological gravities
Johanna Borissova, João Magueijo
Quasi-topological theories of gravity are known to resolve black-hole singularities. We investigate whether the same mechanism can remove cosmological singularities. Focusing on no…
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…
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…