3 papers
math.FA2026
Helson matrices induced by measures
Sameer Chavan, Chaman Kumar Sahu, Kalyan B. Sinha
We discuss the boundedness, Schatten-class properties and scattering theory of Helson matrices. We also discuss a class of Helson matrices induced by positive and signed measures.…
math.SP2026
Shape-Resonance in Spectral density, Scattering Cross-section, Time delay and Bound on Sojourn time
Hemant Bansal, Alok Maharana, Lingaraj Sahu +1
The Friedrichs model~\cite{Friedrichs} is revisited to obtain precise results about the asymptotic behaviour (the so-called Breit-Wigner formula~\cite{Breit}) of a resonance near a…
quant-ph2025
The likelihood operator and Fisher information in quantum probability
Kalyan B. Sinha, Ritabrata Sengupta
We study the problem of Quantum Likelihood Operators (LO) and their connection with quantum Fisher information (QFI). It is observed that the present approaches to this problem tac…