Analogue gravity is a research programme which investigates analogues of general
relativistic gravitational fields within other physical systems, typically but not exclusively …

This chapter provides a brief introduction to the Kerr spacetime and rotating black holes,
touching on the most common coordinate representations of the spacetime metric and the …

Gravity simulators are laboratory systems in which small excitations such as sound or
surface waves, behave as fields propagating on a curved spacetime geometry. The analogy …

We present a lesser known way to conceptualize stationary black holes, which we call the
river model. In this model, space flows like a river through a flat background, while objects …

Photon fluids have recently found applications in the simulation of a variety of physical
phenomena such as superfluidity, vortex instabilities, and artificial gauge theories. Here we …

The standard Lense–Thirring metric is a century-old slow-rotation large-distance
approximation to the gravitational field outside a rotating massive body, depending only on …

In this paper we propose to apply the analogy between gravity and condensed matter
physics to relativistic Bose—Einstein condensates (RBECs), ie condensates composed by …

Optical field fluctuations in self-defocusing media can be described in terms of sound waves
in a two-dimensional photon fluid. It is shown that, while the background fluid couples with …

Analogue physics became very popular in recent decades. It allows simulating inaccessible
physical phenomena, such as black holes, in the laboratory. The first success of analogue …

The Kerr spacetime is perhaps the most astrophysically important of the currently known
exact solutions to the Einstein field equations. Whenever spacetimes can be put in unit …