5 citations · 18 across the 6 of their papers we have counts for
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Cohomology and Topological Anomalies
Christian Ekstrand
The chiral anomaly can be considered as an object defined either on the space of gauge potentials or on the orbit space. We will discuss the relation between the two descriptions.…
Covariant Schwinger terms
C. Adam, C. Ekstrand, T. Sykora
There exist two versions of the covariant Schwinger term in the literature. They only differ by a sign. However, we shall show that this is an essential difference. We shall carefu…
A Geometrical Description of the Consistent and Covariant Chiral Anomaly
C. Ekstrand
A geometrical interpretation of the consistent and covariant chiral anomaly is done in the space-time respective Hamiltonian framework.
k-Gerbes, Line Bundles and Anomalies
C. Ekstrand
We use sets of trivial line bundles for the realization of gerbes. For 1-gerbes the structure arises naturally for the Weyl fermion vacuum bundle at a fixed time. The Schwinger ter…
Z_2-Graded Cocycles in Higher Dimensions
C. Ekstrand
Current superalgebras and corresponding Schwinger terms in 1 and 3 space dimensions are studied. This is done by generalizing the quantization of chiral fermions in an external Yan…
A Simple Algebraic Derivation of the Covariant Anomaly and Schwinger Term
C. Ekstrand
An expression for the curvature of the "covariant" determinant line bundle is given in even dimensional space-time. The usefulness is guaranteed by its prediction of the covariant…