Erling A. T. Svela

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20242026

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math.CA2026

On the existence of optimizers for nonlinear time-frequency concentration problems: the Born--Jordan distribution

Federico Stra, Erling A. T. Svela, S. Ivan Trapasso

We study the $L^{p}$ concentration problem for the Born--Jordan distribution in dimension $d > 1$ , thus extending the one-dimensional analysis in [Stra-Svela-Trapasso, J. Math. Pures A…

math.CA2025

On the existence of optimizers for nonlinear time-frequency concentration problems: the Wigner distribution

Federico Stra, Erling A. T. Svela, S. Ivan Trapasso

We prove that, for any measurable phase space subset $Ω \subset R^{2 d}$ with $0 < ∣Ω∣ < \infty$ and any $1 \leq p < \infty$ , the nonlinear concentration problem $$ \sup_{f \in L^2…