ﻻ يوجد ملخص باللغة العربية
We consider the strong field asymptotics for the occurrence of zero modes of certain Weyl-Dirac operators on $mathbb{R}^3$. In particular we are interested in those operators $mathcal{D}_{B}$ for which the associated magnetic field $B$ is given by pulling back a $2$-form $beta$ from the sphere $mathbb{S}^2$ to $mathbb{R}^3$ using a combination of the Hopf fibration and inverse stereographic projection. If $int_{mathbb{S}^2}beta eq0$ we show that [ sum_{0le tle T}mathrm{dim},mathrm{Ker},mathcal{D}_{tB} =frac{T^2}{8pi^2},biggllvertint_{mathbb{S}^2}betabiggrrvert,int_{mathbb{S}^2}lvert{beta}rvert+o(T^2) ] as $Tto+infty$. The result relies on ErdH{o}s and Solovejs characterisation of the spectrum of $mathcal{D}_{tB}$ in terms of a family of Dirac operators on $mathbb{S}^2$, together with information about the strong field localisation of the Aharonov-Casher zero modes of the latter.
We show that Toda shock waves are asymptotically close to a modulated finite gap solution in the region separating the soliton and the elliptic wave regions. We previously derived formulas for the leading terms of the asymptotic expansion of these sh
We consider discrete spectra of bound states for non-relativistic motion in attractive potentials V_{sigma}(x) = -|V_{0}| |x|^{-sigma}, 0 < sigma leq 2. For these potentials the quasiclassical approximation for n -> infty predicts quantized energy le
We consider the radial wave equation in similarity coordinates within the semigroup formalism. It is known that the generator of the semigroup exhibits a continuum of eigenvalues and embedded in this continuum there exists a discrete set of eigenvalu
We study the small dispersion limit for the Korteweg-de Vries (KdV) equation $u_t+6uu_x+epsilon^{2}u_{xxx}=0$ in a critical scaling regime where $x$ approaches the trailing edge of the region where the KdV solution shows oscillatory behavior. Using t
Let $Lambda$ be a lattice in ${bf R}^d$ with positive co-volume. Among $Lambda$-periodic $N$-point configurations, we consider the minimal renormalized Riesz $s$-energy $mathcal{E}_{s,Lambda}(N)$. While the dominant term in the asymptotic expansion o