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排序方式: 共有104条查询结果,搜索用时 31 毫秒
21.
22.
Misha Chertkov Bob Ecke Gregory Eyink Darryl Holm 《Journal of statistical physics》2003,113(5-6):637-642
23.
It is proved that for any two subsets A and B of an arbitrary finite field $
\mathbb{F}_q
$
\mathbb{F}_q
such that |A||B| > q, the identity 10AB = $
\mathbb{F}_q
$
\mathbb{F}_q
holds. Under the assumption |A||B| ⩾2q, this improves to 8AB = $
\mathbb{F}_q
$
\mathbb{F}_q
. 相似文献
24.
Misha Bialy 《Geometric And Functional Analysis》2010,20(2):357-367
We propose a new condition à{{\aleph}} which enables us to get new results on integrable geodesic flows on closed surfaces. This paper has two parts. In the first,
we strengthen Kozlov’s theorem on non-integrability on surfaces of higher genus. In the second, we study integrable geodesic
flows on a 2-torus. Our main result for a 2-torus describes the phase portraits of integrable flows. We prove that they are
essentially standard outside what we call separatrix chains. The complement to the union of the separatrix chains is C
0-foliated by invariant sections of the bundle. 相似文献
25.
A hypercomplex manifold is a manifold equipped with a triple of complex structures I, J, K satisfying the quaternionic relations. We define a quaternionic analogue of plurisubharmonic functions on hypercomplex manifolds, and interpret these functions geometrically as potentials of HKT (hyperkähler with torsion) metrics. We prove a quaternionic analogue of A. D. Aleksandrov and ChernLevine-Nirenberg theorems. 相似文献
26.
27.
We show (i) how the evolution of a wave packet created from an initial thermal ensemble can be controlled by manipulating interferences during the wave packet's fractional revivals and (ii) how the wave-packet evolution can be mapped onto the dynamics of a few-state system, where the number of states is determined by the amount of information one wants to track about the wave packet in the phase space. We illustrate our approach by (i) switching off and on field-free molecular axis alignment induced by a strong laser pulse and (ii) converting alignment into field-free orientation, starting with rotationally cold or hot systems. 相似文献
28.
Spanner M Ivanov MY Kalosha V Hermann J Wiersma DA Pshenichnikov M 《Optics letters》2003,28(9):749-751
We show how cross-phase modulation between two pulses, combined with optimal pulse shaping at the input of a dielectric medium, can be used to generate nearly single-cycle pulses that are tunable from the ultraviolet to the mid-infrared at the output of the medium, precompensating for dispersion to all orders. 相似文献
29.
Misha Verbitsky 《Selecta Mathematica, New Series》2004,10(4):551-559
For any subvariety of a compact holomorphic symplectic Kähler manifold, we define the symplectic Wirtinger number W(X). We show that
and the equality is reached if and only if the subvariety
is trianalytic, i.e. compatible with the hyperkähler structure on M. For a sequence
of immersions of simple holomorphic symplectic manifolds, we show that
相似文献
30.
We discuss electron diffraction from two counterpropagating light waves with two different frequencies. We show that, even though these waves do not form a standing wave, electron diffraction similar to the conventional Kapitza-Dirac effect, i.e., scattering on a standing wave, is still possible. The nonlinear response of the electron to the laser fields creates a stationary diffraction grating from which the same electron scatters. 相似文献