On Perturbed Two-Dimensional Dirac Operators

2016 ◽  
Vol 41 (3) ◽  
pp. 1249-1263
Author(s):  
Suo Zhao
Keyword(s):  
Dirac Operators ◽  
Two Dimensional

scholarly journals On the Gauss-Bonnet for the quasi-Dirac operators on the sphere

2017 ◽  
Vol 50 (1) ◽  
pp. 66-71
Author(s):  
Andrzej Sitarz
Keyword(s):  
Scalar Curvature ◽  
Dirac Operators ◽  
Two Dimensional ◽  
Spectral Triples ◽  
Bonnet Theorem

Abstract We investigate examples of Gauss-Bonnet theorem and the scalar curvature for the two-dimensional commutative sphere with quasi-spectral triples obtained by modifying the order-one condition.

scholarly journals Two-dimensional Dirac operators with singular interactions supported on closed curves

2020 ◽  
Vol 279 (8) ◽  
pp. 108700
Author(s):  
Jussi Behrndt ◽  
Markus Holzmann ◽  
Thomas Ourmières-Bonafos ◽  
Konstantin Pankrashkin
Keyword(s):  
Dirac Operators ◽  
Two Dimensional ◽  
Closed Curves ◽  
Singular Interactions

scholarly journals Self-Adjointness of Two-Dimensional Dirac Operators on Domains

2017 ◽  
Vol 18 (4) ◽  
pp. 1371-1383 ◽  
Author(s):  
Rafael D. Benguria ◽  
Søren Fournais ◽  
Edgardo Stockmeyer ◽  
Hanne Van Den Bosch
Keyword(s):  
Dirac Operators ◽  
Two Dimensional

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

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