Konstantinos Efstathiou
Associate Professor of Mathematics
Associate Dean of Undergraduate Curricular Affairs
Duke Kunshan University
Konstantinos Efstathiou is Associate Professor of Mathematics at Duke Kunshan University.
His research interests in dynamical systems include the geometrical and topological aspects of integrable Hamiltonian systems and the collective dynamics of coupled oscillators.
Recent Posts
Our recent preprint Hamiltonian Monodromy in a Tavis-Cummings System with an $A_2$ Singularity, with Gabriela Gutierrez-Guillen, Pavao Mardešić, and Dominique Sugny, analyzes the topology of the singular Lagrangian fibration of the classical two-spin Tavis–Cummings system. We show that this three-degree-of-freedom integrable Hamiltonian system has a singularity of $A_2$ type which has not been previously observed in “well-behaved” singular Lagrangian fibrations and goes beyond the familiar focus–focus ($A_1$) singularity.