14 citations · 34 across the 19 of their papers we have counts for
21 papers
Schatten class Hankel operators on doubling Fock spaces and the Berger-Coburn phenomenon
Ghazaleh Asghari, Jani A. Virtanen, Zhangjian Hu
Using the notion of integral distance to analytic functions, we give a characterization of Schatten class Hankel operators acting on doubling Fock spaces on the complex plane and u…
Crouzeix's conjecture for classes of matrices
Ryan O'Loughlin, Jani Virtanen
For a matrix which satisfies Crouzeix's conjecture, we construct several classes of matrices from for which the conjecture will also hold. We discover a new link between cy…
Volterra-type inner derivations on Hardy spaces
H. Arroussi, C. Tong, J. A. Virtanen +1
A classical result of Calkin [Ann. of Math. (2) 42 (1941), pp. 839-873] says that an inner derivation maps the algebra of bounded operators on a Hilbert sp…
On the Berger-Coburn phenomenon
Zhangjian Hu, Jani A. Virtanen
In their previous work, the authors proved the Berger-Coburn phenomenon for compact and Schatten class Hankel operators on generalized Fock spaces when , th…
On the spectrum of the double-layer operator on locally-dilation-invariant Lipschitz domains
Simon N. Chandler-Wilde, Raffael Hagger, Karl-Mikael Perfekt +1
We say that , the boundary of a bounded Lipschitz domain, is locally dilation invariant if, at each , is either locally or locally coincides (in some coordinat…
Essential positivity
A. Perälä, J. A. Virtanen
We define essentially positive operators on Hilbert space as a class of self-adjoint operators whose essential spectra is contained in the nonnegative real numbers and describe the…