Yunlei Wang

activity

20222026

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4 papers · 1 filter

math.CA2026

Sparse supports of lattice eigenfunctions: quantitative growth and algebraic rigidity

Yunlei Wang

We study how sparsely a nonzero discrete harmonic function on the standard lattice $Z^{d}$ can be supported. Let $Q_{n}^{(d)} = {- n, \dots, n}^{d}$ , and let $m_{d} (n)$ denote the l…

math.AP2026

Curved Ingham Inequalities for Dispersive Trigonometric Sums

Bernhard H Haak, Philippe Jaming, Ming Wang +1

We study $L^{2}$ restrictions of dispersive trigonometric sums $F (t, x) = n \in Z \sum c_{n} e^{2 π i (∣ n ∣^{s} t + n x)}$ to curves in the $(t, x)$ -plane. Our main result is a curved analogue…

math.AP2026

Approximate null-controllability of discrete heat equations with potentials on lattices

Yann Bourroux, Philippe Jaming, Yunlei Wang

We investigate approximate null-controllability for semi-discrete heat equations on the lattice $h Z^{d}$ with a potential. By establishing spectral inequalities for the disc…

math.AP2026

Observability and Semiclassical Control for Schrödinger Equations on Non-compact Hyperbolic Surfaces

Xin Fu, Yulin Gong, Yunlei Wang

We study the observability of the Schrödinger equation on $X$ , a non-compact covering space of a compact hyperbolic surface $M$ . Using a generalized Bloch theory, functions on $X$ …