Rossby waves are a pervasive feature of the large-scale motions of the Earth's atmosphere
and oceans. These waves (also known as planetary waves and r-modes) also play an …

We relate the model of vorticity wave interaction to Krein collision, PT-symmetry breaking,
and the formation of exceptional points in shear flow instabilities. We show that the …

The Holmboe wave instability is one of the classic examples of a stratified shear instability,
usually explained as the result of a resonance between a gravity wave and a vorticity wave …

One mechanistic interpretation of baroclinic instability is that of mutual constructive
interference of Rossby edge waves. The suppression of baroclinic instability over slopes has …

This study is a direct follow-up of the paper by Heifetz and Guha [Phys. Rev. E 100, 043105
(2019) 2470-0045 10.1103/PhysRevE. 100.043105] on a minimal nonlinear dynamical …

Here we show how Feynman's simplified model for the Josephson junction, as a
macroscopic two-state coupled quantum system, has a one-to-one correspondence with the …

The Kelvin–Helmholtz (KH) instability of a shear layer with an initially uniform magnetic field
in the direction of flow is studied in the framework of 2D incompressible …

A recent letter [JR Carpenter and A. Guha,“Instability of a smooth shear layer through wave
interactions,” Phys. Fluids 31, 081701 (2019)] compared the neutral modes of a smooth two …

We establish a link between vorticity wave interaction and $\mathcal {PT} $-symmetry
breaking in shear flow instabilities. The minimal dynamical system for two coupled counter …

Studies of Kelvin–Helmholtz (KH) instability have typically modelled the initial mean flow as
an isolated stratified shear layer. However, geophysical flows frequently exhibit multiple …