275 citations · 1.7k across the 132 of their papers we have counts for
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Inverse problems for locally perturbed lattices -- Discrete Hamiltonian and quantum graph
Emilia Blåsten, Pavel Exner, Hiroshi Isozaki +2
We consider the inverse scattering problems for two types of Schrödinger operators on locally perturbed periodic lattices. For the discrete Hamiltonian, the knowledge of the S-matr…
On the inverse problem of finding cosmic strings and other topological defects
Matti Lassas, Lauri Oksanen, Plamen Stefanov +1
We consider how microlocal methods developed for tomographic problems can be used to detect singularities of the Lorentzian metric of the Universe using measurements of the Cosmic…
On Absence and Existence of the Anomalous Localized Resonance without the Quasi-static Approximation
Henrik Kettunen, Matti Lassas, Petri Ola
The paper considers the transmission problems for Helmholtz equation with bodies that have negative material parameters. Such material parameters are used to model metals on optica…
Linearization stability results and active measurements for the Einstein-scalar field equations
Yaroslav Kurylev, Matti Lassas, Gunther Uhlmann
We study the Einstein equations coupled with the scalar field equations, , , and , where the sources c…
Schrodinger's Hat: Electromagnetic, acoustic and quantum amplifiers via transformation optics
Allan Greenleaf, Yaroslav Kurylev, Matti Lassas +1
The advent of transformation optics and metamaterials has made possible devices producing extreme effects on wave propagation. Here we give theoretical designs for devices, Schrödi…
Approximate quantum and acoustic cloaking
Allan Greenleaf, Yaroslav Kurylev, Matti Lassas +1
At any energy E > 0, we construct a sequence of bounded potentials , supported in an annular region in three-space, which act as approxi…