66 citations · 189 across the 10 of their papers we have counts for
10 papers
Strange Horizons: Understanding Causal Barriers Beyond General Relativity
Bethan Cropp
This thesis explores two avenues into understanding the physics of black holes and horizons beyond general relativity, via analogue models and Lorentz violating theories. Analogue…
Hints of quantum gravity from the horizon fluid
Bethan Cropp, Swastik Bhattacharya, S. Shankaranarayanan
For many years researchers have tried to glean hints about quantum gravity from black hole thermodynamics. However, black hole thermodynamics suffers from the problem of Universali…
Analogue black holes in relativistic BECs: Mimicking Killing and universal horizons
Bethan Cropp, Stefano Liberati, Rodrigo Turcati
Relativistic Bose-Einstein condensates (rBECs) have recently become a well-established system for analogue gravity. Indeed, while such relativistic systems cannot be yet realized e…
Vorticity in analogue gravity
Bethan Cropp, Stefano Liberati, Rodrigo Turcati
In the analogue gravity framework, the acoustic disturbances in a moving fluid can be described by an equation of motion identical to a relativistic scalar massless field propagati…
Ray tracing Einstein-Æther black holes: Universal versus Killing horizons
Bethan Cropp, Stefano Liberati, Arif Mohd +1
Violating Lorentz-invariance, and so implicitly permitting some form of superluminal communication, necessarily alters the notion of a black hole. Nevertheless, in both Einstein-Æt…
Surface gravities for non-Killing horizons
Bethan Cropp, Stefano Liberati, Matt Visser
There are many logically and computationally distinct characterizations of the surface gravity of a horizon, just as there are many logically rather distinct notions of horizon. Fo…
Applications of, and Extensions to, Selected Exact Solutions in General Relativity
Bethan Cropp
In this thesis we consider several aspects of general relativity relating to exact solutions of the Einstein equations. In the first part gravitational plane waves in the Rosen for…
Polarization modes for strong-field gravitational waves
Bethan Cropp, Matt Visser
Strong-field gravitational plane waves are often represented in either the Rosen or Brinkmann forms. These forms are related by a coordinate transformation, so they should describe…
Any spacetime has a Bianchi type I spacetime as a limit
Bethan Cropp, Matt Visser
Pick an arbitrary timelike geodesic in an arbitrary spacetime. We demonstrate that there is a particular limiting process, an "ultra-local limit", in which the immediate neighborho…
General polarization modes for the Rosen gravitational wave
Bethan Cropp, Matt Visser
Strong-field gravitational plane waves are often represented in either the Rosen or Brinkmann forms. While these two metric ansatze are related by a coordinate transformation, so t…