2 papers
math.SP2020
On the eigenvalues of quantum graph Laplacians with large complex couplings
James B. Kennedy, Robin Lang
We study the location of the spectrum of the Laplacian on compact metric graphs with complex Robin-type vertex conditions, also known as conditions, on some or all of the graph…
math.SP2019
On the eigenvalues of the Robin Laplacian with a complex parameter
Sabine Bögli, James B. Kennedy, Robin Lang
We study the spectrum of the Robin Laplacian with a complex Robin parameter on a bounded Lipschitz domain . We start by establishing a number of properties of the correspond…