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Spectral geometry of the Moyal plane with harmonic propagation  [PDF]
Victor Gayral,Raimar Wulkenhaar
Mathematics , 2011, DOI: 10.4171/JNCG/140
Abstract: We construct a `non-unital spectral triple of finite volume' out of the Moyal product and a differential square root of the harmonic oscillator Hamiltonian. We find that the spectral dimension of this triple is d but the KO-dimension is 2d. We add another Connes-Lott copy and compute the spectral action of the corresponding U(1)-Yang-Mills-Higgs model. We find that the `covariant coordinate' involving the gauge field combines with the Higgs field to a unified potential, yielding a deep unification of discrete and continuous parts of the geometry.
Exact analytic expressions for electromagnetic propagation and optical nonlinear generation in finite one-dimensional periodic multilayers  [PDF]
Matteo Cherchi
Physics , 2009, DOI: 10.1103/PhysRevE.69.066602
Abstract: Translation Matrix Formalism has been used to find an exact analytic solution for linear light propagation in a finite one-dimensional (1D) periodic stratified structure. This modal approach allows to derive a closed formula for the electric field in every point of the structure, by simply imposing a convenient form for the boundary conditions. We show how to apply this result to Second Harmonic Generation (SHG) in the undepleted pump regime.
Propagation of compressional elastic waves through a 1-D medium with contact nonlinearities  [PDF]
Bruno Lombard,Jo?l Piraux
Physics , 2008,
Abstract: Propagation of monochromatic elastic waves across cracks is investigated in 1D, both theoretically and numerically. Cracks are modeled by nonlinear jump conditions. The mean dilatation of a single crack and the generation of harmonics are estimated by a perturbation analysis, and computed by the harmonic balance method. With a periodic and finite network of cracks, direct numerical simulations are performed and compared with Bloch-Floquet's analysis.
Sound propagation and oscillations of a superfluid Fermi gas in the presence of a 1D optical lattice  [PDF]
L. P. Pitaevskii,S. Stringari,G. Orso
Physics , 2004, DOI: 10.1103/PhysRevA.71.053602
Abstract: We develop the hydrodynamic theory of Fermi superfluids in the presence of a periodic potential. The relevant parameters governing the propagation of sound (compressibility and effective mass) are calculated in the weakly interacting BCS limit. The conditions of stability of the superfluid motion with respect to creation of elementary excitations are discussed. We also evaluate the frequency of the center of mass oscillation when the superfluid gas is additionally confined by a harmonic trap.
On the harmonic oscillator on the Lobachevsky plane  [PDF]
P. Stovicek,M. Tusek
Physics , 2007, DOI: 10.1134/S1061920807040152
Abstract: We introduce the harmonic oscillator on the Lobachevsky plane with the aid of the potential $V(r)=(a^2\omega^2/4)sinh(r/a)^2$ where $a$ is the curvature radius and $r$ is the geodesic distance from a fixed center. Thus the potential is rotationally symmetric and unbounded likewise as in the Euclidean case. The eigenvalue equation leads to the differential equation of spheroidal functions. We provide a basic numerical analysis of eigenvalues and eigenfunctions in the case when the value of the angular momentum, $m$, equals 0.
Harmonic functions on the lattice: Absolute monotonicity and propagation of smallness  [PDF]
Gabor Lippner,Dan Mangoubi
Mathematics , 2013, DOI: 10.1215/00127094-3164790
Abstract: In this work we establish a connection between two classical notions, unrelated so far: Harmonic functions on the one hand and absolutely monotonic functions on the other hand. We use this to prove convexity type and propagation of smallness results for harmonic functions on the lattice.
A Fulling-Kuchment theorem for the 1D harmonic oscillator  [PDF]
Victor Guillemin,Hamid Hezari
Mathematics , 2011, DOI: 10.1088/0266-5611/28/4/045009
Abstract: We prove that there exists a pair of "non-isospectral" 1D semiclassical Schr\"odinger operators whose spectra agree modulo h^\infty. In particular, all their semiclassical trace invariants are the same. Our proof is based on an idea of Fulling-Kuchment and Hadamard's variational formula applied to suitable perturbations of the harmonic oscillator. Keywords: Inverse spectral problems, semiclassical Schr\"odinger operators, trace invariants, Hadamard's variational formula, harmonic oscillator, Penrose mushroom, Sturm-Liouville theory.
KAM for the quantum harmonic oscillator  [PDF]
Beno?t Grébert,Laurent Thomann
Mathematics , 2010, DOI: 10.1007/s00220-011-1327-5
Abstract: In this paper we prove an abstract KAM theorem for infinite dimensional Hamiltonians systems. This result extends previous works of S.B. Kuksin and J. P\"oschel and uses recent techniques of H. Eliasson and S.B. Kuksin. As an application we show that some 1D nonlinear Schr\"odinger equations with harmonic potential admits many quasi-periodic solutions. In a second application we prove the reducibility of the 1D Schr\"odinger equations with the harmonic potential and a quasi periodic in time potential.
Ground State Energy for Fermions in a 1D Harmonic Trap with Delta Function Interaction  [PDF]
Zhong-Qi Ma,C. N. Yang
Physics , 2009, DOI: 10.1088/0256-307X/26/12/120505
Abstract: Conjectures are made for the ground state energy of a large spin 1/2 Fermion system trapped in a 1D harmonic trap with delta function interaction. States with different spin J are separately studied. The Thomas-Fermi method is used as an effective test for the conjecture.
Beam Propagation in Photonic Crystals  [PDF]
B. Guizal,D. Felbacq,R. Smaali
Physics , 2006,
Abstract: The recent interest in the imaging possibilities of photonic crystals (superlensing, superprism, optical mirages etc...) call for a detailed analysis of beam propagation inside a finite periodic structure. In this paper, we give such a theoretical and numerical analysis of beam propagation in 1D and 2D photonic crystals. We show that, contrarily to common knowledge, it is not always true that the direction of propagation of a beam is given by the normal to the dispersion curve. We explain this phenomenon in terms of evanescent waves and we construct a renormalized dispersion curve that gives the correct direction.
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