Technological advances in controlling and manipulating fluids have enabled the
experimental realization of acoustic analogues of gravitational black holes. A flowing fluid …

Gratings which are in apparent motion reveal some startling properties for classical
radiation, especially for luminal gratings traveling at or around the speed of light. We show …

Reciprocity is a fundamental principle of wave physics related to time-reversal symmetry.
Nonreciprocal wave behaviors have been pursued for decades because of their great …

The superradiant amplification in the scattering from a rotating medium was first elucidated
by Sir Roger Penrose over 50 years ago as a means by which particles could gain energy …

A longstanding pursuit in information communication is to increase transmission capacity
and accuracy, with multiplexing technology playing as a promising solution. To overcome …

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 …

Quantization effects of the nonlinear magnon-vortex interaction in ferromagnetic nanodisks
are studied. We show that the circular geometry twists the spin-wave fields with spiral phase …

Coherent wave control exploits the interference among multiple waves im**ing on a
system to suppress or enhance outgoing signals based on their relative phase and …

Multiplexing technology with increased information capacity plays a crucial role in the realm
of acoustic communication. Different quantities of sound waves, including time, frequency …

Discussion Meeting on The next generation of analogue gravity experiments held at the
Royal Society in December 2019. This theme issue comprises a collection of recent …