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153 results on '"Verbeek, B."'

51. Publieke Besluitvorming

Author

Hart, P. 't, Metselaar, M., Verbeek, B., Goverde, H.J.M., Hart, P. 't, Metselaar, M., Verbeek, B., and Goverde, H.J.M.

Abstract

P. 't Hart Publieke Besluitvorming : ,1996, Item does not contain fulltext

Published
1996

76. Asymmetric noise and output power in semiconductor lasers with optical feedback near threshold.

Author

Mink, J. and Verbeek, B. H.

Subjects
*SEMICONDUCTOR lasers, *OPTICS
Abstract

An asymmetry in the output power and the low-frequency noise emitted from the rear and front facets of index-guided semiconductor lasers with a large percentage of optical feedback into the front facet is reported. Transitions from coherent to incoherent feedback-induced properties by modulation of the feedback path length can be distinguished in the output power versus current (L-I) curve. A cross-over point is found only in the front facet L-I curve corresponding to a minimum in the noise. A model is presented which correctly describes the asymmetry between the L-I curve of the front and rear facets. It also predicts the observed cross-over point in the front facet L-I curve. [ABSTRACT FROM AUTHOR]

Published
1986
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95. All-Order Amplitudes at any Multiplicity in the Multi-Regge Limit.

Author

Duca, V. Del, Druc, S., Drummond, J. M., Duhr, C., Dulat, F., Marzucca, R., Papathanasiou, G., and Verbeek, B.

Subjects
*MULTIPLICITY (Mathematics), *YANG-Mills theory, *KINEMATICS
Abstract

We propose an all-loop expression for scattering amplitudes in planar N=4 super Yang-Mills theory in multi-Regge kinematics valid for all multiplicities, all helicity configurations, and arbitrary logarithmic accuracy. Our expression is arrived at from comparing explicit perturbative results with general expectations from the integrable structure of a closely related collinear limit. A crucial ingredient of the analysis is an all-order extension for the central emission vertex that we recently computed at next-to-leading logarithmic accuracy. As an application, we use our all-order formula to prove that all amplitudes in this theory in multi-Regge kinematics are single-valued multiple polylogarithms of uniform transcendental weight. [ABSTRACT FROM AUTHOR]

Published
2020
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100. Full-Color Two-Loop Four-Gluon Amplitude in N=2 Supersymmetric QCD.

Author

Duhr C, Johansson H, Kälin G, Mogull G, and Verbeek B

Abstract

We present the fully integrated form of the two-loop four-gluon amplitude in N=2 supersymmetric quantum chromodynamics with gauge group SU(N_{c}) and with N_{f} massless supersymmetric quarks (hypermultiplets) in the fundamental representation. Our result maintains full dependence on N_{c} and N_{f}, and relies on the existence of a compact integrand representation that exhibits the duality between color and kinematics. Specializing to the N=2 superconformal theory, where N_{f}=2N_{c}, we obtain remarkably simple amplitudes that have an analytic structure close to that of N=4 super-Yang-Mills theory, except that now certain lower-weight terms appear. We comment on the corresponding results for other gauge groups.

Published
2019
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