201 citations · 258 across the 14 of their papers we have counts for
8 papers · 1 filter
Carrier Density Oscillation in photoexcited Semiconductors
Ebrahim Najafi, Amir Jafari, Bolin Liao +1
The perturbation of a semiconductor from the thermodynamic equilibrium often leads to the display of nonlinear dynamics and formation of spatiotemporal patterns due to the spontane…
Magnetic topology in fluids
Amir Jafari, Ethan Vishniac
We study the evolution of turbulent magnetic fields from a topological point of view, invoking commonplace mathematical tools from general topology and dynamical systems theory whi…
Topological theory of physical fields
Amir Jafari, Ethan Vishniac
We study the topology associated with physical vector and scalar fields. A mathematical object, e.g., a ball, can be continuously deformed, without tearing or gluing, to make other…
Statistical Analysis of Stochastic Magnetic Fields
Amir Jafari, Ethan Vishniac, Vignesh Vaikundaraman
Previous work has introduced scale-split energy density ψfor a given vector field B in order to quantify the field stochasticity S(t). Application to turbulent magnetic fields lead…
Magnetic stochasticity and diffusion
Amir Jafari, Ethan Vishniac, Vignesh Vaikundaraman
We develop a quantitative relationship between magnetic diffusion and the level of randomness, or stochasticity, of the diffusing magnetic field in a magnetized medium. A general m…
Gravitational Radiation from Binaries: A Pedagogical Introduction
Amir Jafari
This short note serves as an introduction to gravitational radiation through reviewing the inspiral-plunge transition phase in extreme mass ratio binaries. We study the relativisti…
Electromagnetic Helicity in Classical Physics
Amir Jafari
This pedagogical note revisits the concept of electromagnetic helicity in classical systems. In particular, magnetic helicity and its role in mean field dynamo theories is briefly…
Magnetic Fields in Accretion Disks: A Review
Amir Jafari
We review the current theoretical models of the inward advection of the large scale external magnetic fields in accretion discs. The most plausible theories for launching astrophys…