نتایج جستجو برای: heisenberg frame
تعداد نتایج: 110602 فیلتر نتایج به سال:
The study of step 2 subRiemannian manifolds has the Heisenberg group as a prototype. This is a noncommutative Lie group with the base manifold R and endowed with a nonintegrable distribution spanned by two of the noncommutative left invariant vector fields. This structure enjoys also the property of being a contact structure or a CR-manifold. The study of the subRiemannian geodesics on the Heis...
In this paper, a system with spin S=3/2 with general isotropic nearest neighbor exchange within a mean field approximation possess is discnssed. We derive equations describing non-Heisenberg isotropic model using coherent states of SU(4) group in real parameters and then obtain dispersion equations of spin wave of dipole and quadrupole branches for a small linear excitation from the ground state.
in this paper we get some results and applications for duals and approximate duals of g-frames in hilbert spaces. in particular, we consider the stability of duals and approximate duals under bounded operators and we study duals and approximate duals of g-frames in the direct sum of hilbert spaces. we also obtain some results for perturbations of approximate duals.
in this paper, g-dual function-valued frames in l2(0;1) are in-troduced. we can achieve more reconstruction formulas to ob-tain signals in l2(0;1) by applying g-dual function-valued framesin l2(0;1).
Hilbert frames theory have been extended to frames in Hilbert $C^*$-modules. The paper introduces equivalent $*$-frames and presents ordinary duals of a constructed $*$-frame by an adjointable and invertible operator. Also, some necessary and sufficient conditions are studied such that $*$-frames and ordinary duals or operator duals of another $*$-frames are equivalent under these conditions. W...
Using both mean field renormalization group (MFRG) and Surface-Bulk MFRG (SBMFRG), we study the critical behavior of the classical Heisenberg and XY models on a simple cubic lattice. Critical temperatures as well as critical exponents, characteristic the universality classes of these two models were calculated, analytically for1, 2, 3 and 4 spin clusters. The results are in good agreement with...
The Grushin plane is a right quotient of the Heisenberg group. Heisenberg geodesics’ projections are solutions of an isoperimetric problem in the Grushin plane.
We consider, in the frame of the long-wavelength Heisenberg model, the effect of a pinning field on the spin wave band gaps and transmission spectra of one-dimensional comb-like structures. Using a Green’s function method, we obtained closed-form expressions for the band structure and the transmission coefficients for an arbitrary value of the number N of sites (N ′of resonators) in the comb-li...
In an earlier paper, we considered a phenomenological action with unconventional supersymmetry. Here we consider a microscopic statistical picture which leads to exactly the same form for the action that was postulated before. We find that standard physics can be regained at low energy for fermions and gauge bosons, but that there are testable violations of Lorentz invariance, both for fermions...
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