75 citations · 258 across the 15 of their papers we have counts for
4 papers · 1 filter
Dynamics of low energy wave packets in the one-dimensional quantum Heisenberg ferromagnet
Mateusz Kwaśnicki, Marcin Napiórkowski, Sören Petrat +1
Spin wave theory plays a central role in the analysis of low-energy properties of the quantum ferromagnetic Heisenberg model. In this work, we present a first step towards a rigoro…
Large time behavior of Lévy processes and their nonlocal Schrödinger semigroups
Mateusz Kwaśnicki, Phanuel Mariano, Hugo Panzo +1
We study the large time asymptotics of the Feynman-Kac semigroups of the symmetric Lévy process on unbounded open sets. Our main result proves the exact exponential asymptotic deca…
Bell-shaped functions are Poisson kernels
Mateusz Kwaśnicki
In a recent paper [Kwaśnicki, Poisson kernels on the half-plane are bell-shaped, Bull. London Math. Soc. 58 (2026), no. e70303], the author proved that Poisson kernels for a class…
Generalised eigenvector expansion of infinite Toeplitz matrices with absolutely/completely monotone entries
Mateusz Kwaśnicki, Jacek Wszoła
We study the spectral theory of infinite Toeplitz matrices under the assumption that and are completely monotone sequences. We derive expressio…