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排序方式: 共有329条查询结果,搜索用时 234 毫秒
31.
E. M. C. de Abreu C. Neves Clovis Wotzasek 《Zeitschrift fur Physik C Particles and Fields》1995,68(3):509-512
We show that a complete covariantization of the chiral constraint in the Floreanini-Jackiw necessitates an infinite number of auxiliary Wess-Zumino fields other-wise the covariantization is only partial and unable to remove the nonlocality in the chiral boson operator. We comment on recent works that claim to obtain covariantization through the use of Batalin-Fradkin-Tyutin method, that uses just one Wess-Zumino field. 相似文献
32.
33.
M. C. Abreu M. Alimi C. Baglin A. Baldit G. P. Barreira M. Bedjidian P. Bordalo S. Borenstein J. Britz A. Bussiere P. Busson A. Casaca R. Cases J. Castor C. Charlot B. Chaurand D. Contardo E. Descroix A. Devaux J. Fargeix X. Felgeyrolles P. Force L. Fredj J. M. Gago C. Gerschel P. Gomes P. Gorodetzky J. Y. Grossiord A. Guichard J. P. Guillaud R. Haroutunian L. Kluberg L. Kraus G. Landaud I. Linck C. Louren?o A. Maio L. Peralta M. Pimenta J. R. Pizzi C. Racca S. Ramos A. Romana R. Salmeron A. Sinquin P. Sonderegger J. Varela NA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1988,38(1):129-133
The like-sign dimuons copiously recorded in the NA 38 experiment both inp-U and O?U reactions at 200 GeV/nucleon are interpreted as resulting from decays of π andK mesons in comparable proportions. The ++/?? ratio is large (?1.7) and ascribed to theK + being more copiously produced than theK ?. Both the average transverse momentum and the ++/?? ratio are comparable forp-U and O?U reactions, and both increase only slightly with the transverse energyE T . 相似文献
34.
Raul A. Abreu 《Physics letters. A》1984,100(7):375-378
The results of electron energy loss measurements on polycrystalline films of PbF2, PbC12, PbBr2 and PbI2 are present and the calculated dielectric functions are discussed in relation to their band structures and optical data. 相似文献
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36.
Aad G Abbott B Abdallah J Abdelalim AA Abdesselam A Abdinov O Abi B Abolins M Abramowicz H Abreu H Acerbi E Acharya BS Ackers M Adams DL Addy TN Adelman J Aderholz M Adomeit S Adragna P Adye T Aefsky S Aguilar-Saavedra JA Aharrouche M Ahlen SP Ahles F Ahmad A Ahsan M Aielli G Akdogan T Akesson TP Akimoto G Akimov AV Alam MS Alam MA Albrand S Aleksa M Aleksandrov IN Aleppo M Alessandria F Alexa C Alexander G Alexandre G Alexopoulos T Alhroob M Aliev M Alimonti G Alison J Aliyev M Allport PP 《Physical review letters》2010,105(25):252303
By using the ATLAS detector, observations have been made of a centrality-dependent dijet asymmetry in the collisions of lead ions at the Large Hadron Collider. In a sample of lead-lead events with a per-nucleon center of mass energy of 2.76 TeV, selected with a minimum bias trigger, jets are reconstructed in fine-grained, longitudinally segmented electromagnetic and hadronic calorimeters. The transverse energies of dijets in opposite hemispheres are observed to become systematically more unbalanced with increasing event centrality leading to a large number of events which contain highly asymmetric dijets. This is the first observation of an enhancement of events with such large dijet asymmetries, not observed in proton-proton collisions, which may point to an interpretation in terms of strong jet energy loss in a hot, dense medium. 相似文献
37.
We consider a bounded open set with smooth boundary \(\Omega \subset M\) in a Riemannian manifold (M, g), and suppose that there exists a non-trivial function \(u\in C({\overline{\Omega }})\) solving the problem in the distributional sense, with \(V\in L^\infty (\Omega )\), where \(u\equiv 0\) on \(\partial \Omega .\) We prove a sharp inequality involving \(||V||_{L^{\infty }(\Omega )}\) and the first eigenvalue of the Laplacian on geodesic balls in simply connected spaces with constant curvature, which slightly generalises the well-known Faber–Krahn isoperimetric inequality. Moreover, in a Riemannian manifold which is not necessarily simply connected, we obtain a lower bound for \(||V||_{L^{\infty }(\Omega )}\) in terms of its isoperimetric or Cheeger constant. As an application, we show that if \(\Omega \) is a domain on a m-dimensional minimal submanifold of \({\mathbb {R}}^n\) which lies in a ball of radius R, then
相似文献
$$\begin{aligned} -\Delta u=V(x)u, \,\, \text{ in }\,\,\Omega , \end{aligned}$$
$$\begin{aligned} ||V||_{L^{\infty }(\Omega )}\ge \left( \frac{m}{2R}\right) ^{2}. \end{aligned}$$
38.
Juan Bory Reyes Ricardo Abreu Blaya Martín P. Árciga Alejandre Yudier Peña Pérez 《Complex Analysis and Operator Theory》2018,12(5):1369-1382
In this paper we are interested in finding solvability conditions for Riemann and Dirichlet type boundary value problems with generalized Hölder-continuous boundary data in the case of hyperanalytic functions defined in a domain of the complex plane bounded by an h-summable closed curve. 相似文献
39.
40.
Luís Daniel Abreu 《Monatshefte für Mathematik》2010,161(3):237-253
We study the structure of Gabor and super Gabor spaces inside ${L^{2}(\mathbb{R}^{2d})}$ and specialize the results to the case where the spaces are generated by vectors of Hermite functions. We then construct an isometric isomorphism between such spaces and Fock spaces of polyanalytic functions and use it in order to obtain structure theorems and orthogonal projections for both spaces at once, including explicit formulas for the reproducing kernels. In particular we recover a structure result obtained by N. Vasilevski using complex analysis and special functions. In contrast, our methods use only time-frequency analysis, exploring a link between time-frequency analysis and the theory of polyanalytic functions, provided by the polyanalytic part of the Gabor transform with a Hermite window, the polyanalytic Bargmann transform. 相似文献