95 citations · 156 across the 13 of their papers we have counts for
15 papers
Dispersive decay estimates for Dirac equations with a domain wall
Joseph Kraisler, Amir Sagiv, Michael I. Weinstein
Dispersive time-decay estimates are proved for a one-parameter family of one-dimensional Dirac Hamiltonians with dislocations; these are operators which interpolate between two pha…
Near invariance of quasi-energy spectrum of Floquet Hamiltonians
Amir Sagiv, Michael I. Weinstein
The spectral analysis of the unitary monodromy operator, associated with a time-periodically (paramatrically) forced Schrodinger equation, is a question of longstanding interest. H…
An Approximation Theory Framework for Measure-Transport Sampling Algorithms
Ricardo Baptista, Bamdad Hosseini, Nikola B. Kovachki +2
This article presents a general approximation-theoretic framework to analyze measure transport algorithms for probabilistic modeling. A primary motivating application for such algo…
Radiative decay of edge states in Floquet media
Sameh N. Hameedi, Amir Sagiv, Michael I. Weinstein
We consider the effect of time-periodic forcing on a one-dimensional Schr{ö}dinger equation with a topologically protected defect (edge) mode. The unforced system models a domain-w…
Minimizing optimal transport for functions with fixed-size nodal sets
Qiang Du, Amir Sagiv
Consider the class of zero-mean functions with fixed and norms and exactly nodal points. Which functions minimize , the Wasse…
Effective gaps in continuous Floquet Hamiltonians
Amir Sagiv, Michael I. Weinstein
We consider two-dimensional Schroedinger equations with honeycomb potentials and slow time-periodic forcing of the form: $$iψ_t (t,x) = H^\varepsilon(t)ψ=\left(H^0+2i\varepsilon A…
Spectral convergence of probability densities for forward problems in uncertainty quantification
Amir Sagiv
The estimation of probability density functions (PDF) using approximate maps is a fundamental building block in computational probability. We consider forward problems in uncertain…
Kernel-based parameter estimation of dynamical systems with unknown observation functions
Ofir Lindenbaum, Amir Sagiv, Gal Mishne +1
A low-dimensional dynamical system is observed in an experiment as a high-dimensional signal; for example, a video of a chaotic pendulums system. Assuming that we know the dynamica…
Loss of Physical Reversibility in Reversible Systems
Amir Sagiv, Adi Ditkowski, Roy H. Goodman +1
A dynamical system is said to be reversible if, given an output, the input can always be recovered in a well-posed manner. Nevertheless, we argue that reversible systems that have…
The Wasserstein Distances Between Pushed-Forward Measures with Applications to Uncertainty Quantification
Amir Sagiv
In the study of dynamical and physical systems, the input parameters are often uncertain or randomly distributed according to a measure . The system's response pushes…
Loss of Polarization in Collapsing Beams
Gauri Patwardhan, Xiaohui Gao, Amir Sagiv +5
We show theoretically and demonstrate experimentally that collapsing elliptically-polarized laser beams experience a nonlinear ellipse rotation that is highly sensitive to small fl…
Density Estimation in Uncertainty Propagation Problems Using a Surrogate Model
Adi Ditkowski, Gadi Fibich, Amir Sagiv
The effect of uncertainties and noise on a quantity of interest (model output) is often better described by its probability density function (PDF) than by its moments. Although den…
Loss of phase and universality of stochastic interactions between laser beams
Amir Sagiv, Adi Ditkowski, Gadi Fibich
We show that all laser beams gradually lose their initial phase information in nonlinear propagation. Therefore, if two beams travel a sufficiently long distance before interacting…
Relativistic Radiation Mediated Shocks
Ran Budnik, Boaz Katz, Amir Sagiv +1
The structure of relativistic radiation mediated shocks (RRMS) propagating into a cold electron-proton plasma is calculated and analyzed. A qualitative discussion of the physics of…
Probing the Magnetic Field Structure in Gamma-Ray Bursts through Dispersive Plasma Effects on the Afterglow Polarization
Amir Sagiv, Eli Waxman, Abraham Loeb
(Abr) The origin and structure of magnetic fields in Gamma-Ray Burst (GRB) fireball plasmas are two of the most important open questions in all GRB models. We show that the structu…