نتایج جستجو برای: field anomaly
تعداد نتایج: 822318 فیلتر نتایج به سال:
It is generally believed that an anomaly should be expected over the continent–ocean (C–O) boundary in the global magnetic anomaly maps. However, such maps prepared at satellite altitude do not show an anomaly over most of the C–O boundary. We address this issue by a forward modelling technique. We use a Geographic Information System (GIS) technique to integrate information of the various geolo...
We demonstrate theoretically and experimentally a two-scale architecture able to achieve giant field enhancement by simultaneously exploiting both the Rayleigh anomaly and localized surface plasmon resonance. Metallic oligomers composed of colloidal nanospheres are well-known for the ability to strongly enhance the near-field at their plasmonic resonance. However, due to intrinsic nonlocality o...
We study the conformal symmetry and the energy-momentum conservation of scalar field interacting with a curved background at D = 2. We avoid to incorporate the metric determinant into the measure of the scalar field to explain the conformal anomaly and the consequent energy-momentum conservation. Contrarily, we split the scalar field in two other fields, in such a way that just one of them can ...
23 OCTOBER 2015 • VOL 350 ISSUE 6259 379 crystal momentum space. This, however, is not important, as a similar effect should be observed in Weyl semimetals, where opposite-chirality fermions exist at distinct points in momentum space. The way that the chiral anomaly manifests in Na 3 Bi is through magnetoresistance (a dependence of the electrical resistance of the material on an applied magneti...
John Bell’s emphasis of the essential ambiguities in anomaly calculations is recalled. Some descendants of the anomaly are reviewed. 1 John Bell and the Chiral Anomaly I expect that most everyone in this audience knows that John Bell codiscovered the mechanism of anomalous symmetry breaking in quantum field theory. Indeed, our paper on this subject [1] is his (and my) most-cited work. The symme...
We analyze the general solution of the Wess-Zumino consistency condition in abelian lattice gauge theories, without taking the classical continuum limit. We find that, if the anomaly density is a local pseudo-scalar field on the lattice, the non-trivial anomaly is always proportional to the anomaly coefficient in the continuum theory. The possible extension of this result to non-abelian theorie...
Weyl semimetals provide the realization of Weyl fermions in solid-state physics. Among all the physical phenomena that are enabled by Weyl semimetals, the chiral anomaly is the most unusual one. Here, we report signatures of the chiral anomaly in the magneto-transport measurements on the first Weyl semimetal TaAs. We show negative magnetoresistance under parallel electric and magnetic fields, t...
We show how the natural Abelian duality of 2 and 3-form gravity theories in 7-dimensional manifold CY3 × S leads to an S-duality between 2 and 3-form theories on simply connected CY3. The massless sector of the 2-form field theory on CY3 corresponds to the A model string field theory. We discuss the complex structure independence of the 2 form theory for a general Kähler manifold and derive the...
Simple scaling properties of correlation functions of a confining gauge theory in d-dimensions lead to the conclusion that k-string dynamics is described, in the infrared limit, by a two-dimensional conformal field theory with conformal anomaly c = (d−2)σk/σ, where σk is the k-string tension and σ that of the fundamental representation. This result applies to any gauge theory with stable k-stri...
Recently, high-order statistics have received more and more interest in the field of hyperspectral anomaly detection. However, most of the existing high-order statistics based anomaly detection methods require stepwise iterations since they are the direct applications of blind source separation. Moreover, these methods usually produce multiple detection maps rather than a single anomaly distrib...
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