نتایج جستجو برای: dispersion relation
تعداد نتایج: 351994 فیلتر نتایج به سال:
We study the so called crossing estimate for analytic dispersion relations of periodic lattice systems in dimensions three and higher. Under a certain regularity assumption on the behavior of the dispersion relation near its critical values, we prove that an analytic dispersion relation suppresses crossings if and only if it is not a constant on any affine hyperplane. In particular, this will t...
Abstract Background: Considering the increasing incidence of acute coronary syndrome (ACS) without diagnostic ECG change and importance of diagnostic markers including QT dispersion in ACS, we aimed to determine the relationship between QT dispersion and CK-MB in patients who referred to Taleghani Hospital in year 1391. Materials and methods: This cross-sectional study was concluded on patients...
OBJECTIVE To study QT dispersion in left ventricular hypertrophy and chronic heart failure and to determine the relation to ventricular arrhythmias. SETTING Investigational laboratory of a tertiary referral centre. STUDY DESIGN Patients with left ventricular hypertrophy and normal systolic function (n = 14) and patients with chronic heart failure (n = 18) were matched with controls (n = 17)...
A bstract We present a dispersion relation for defect CFT that reconstructs two-point functions in the presence of as an integral single discontinuity. The main virtue this formula is it streamlines explicit bootstrap calculations, bypassing resummation conformal blocks. As applications we reproduce known results monodromy defects epsilon-expansion, and new supersymmetric Wilson line at strong ...
We calculate the dispersion relation associated with a solitary wave in a quasi-one-dimensional Bose-Einstein condensate of atoms confined in a harmonic, cylindrical trap in the limit of weak and strong interactions. In both cases, the dispersion relation is linear for long-wavelength excitations and terminates at the point where the group velocity vanishes. We also calculate the dispersion rel...
Many CFT problems, e.g. ones with global symmetries, have correlation functions a crossing antisymmetric sector. We show that such function can be expanded in terms of manifestly objects, which we call the '+ type Polyakov blocks'. These blocks are built from AdS$_{d+1}$ Witten diagrams. In 1d they encode type' analytic functionals act on functions. general d establish this diagram basis disper...
To know the properties of a particle or a wave, one should measure how its energy changes with its momentum. The relation between them is called the dispersion relation, which encodes essential information of the kinetics. In a magnet, the wave motion of atomic spins serves as an elementary excitation, called a spin wave, and behaves like a fictitious particle. Although the dispersion relation ...
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