13 citations · 36 across the 15 of their papers we have counts for
4 papers · 1 filter
Observability of Baouendi-Grushin-Type Equations Through Resolvent Estimates
Cyril Letrouit, Chenmin Sun
In this article, we study the observability (or, equivalently, the controllability) of some subelliptic evolution equations depending on their step. This sheds light on the speed o…
Observability and Controllability for the Schr{ö}dinger Equation on Quotients of Groups of Heisenberg Type
Clotilde Fermanian Kammerer, Cyril Letrouit
We give necessary and sufficient conditions for the controllability of a Schr\''odinger equation involving the sub-Laplacian of a nilmanifold obtained by taking the quotient of a g…
Quantum limits of sub-Laplacians via joint spectral calculus
Cyril Letrouit
We establish two results concerning the Quantum Limits (QLs) of some sub-Laplacians. First, under a commutativity assumption on the vector fields involved in the definition of the…
Subelliptic wave equations are never observable
Cyril Letrouit
It is well-known that observability (and, by duality, controllability) of the elliptic wave equation, i.e., with a Riemannian Laplacian, in time is almost equivalent to the G…