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- K. Scharnhorst
- 1999

The article reviews some of the (fairly scattered) information available in the mathematical literature on the subject of angles in complex vector spaces. The following angles and their relations are considered: Euclidean, complex, and Hermitian angles, (Kasner’s) pseudo-angle, the Kähler angle (synonyms for the latter used in the literature are: angle of… (More)

- K. Scharnhorst
- 1993

The Letter reconsiders a result obtained by Chrétien and Peierls in 1954 within nonlocal QED in 4D [Proc. Roy. Soc. London A 223, 468]. Starting from secondly quantized fermions subject to a nonlocal action with the kernel [i 6∂x a (x)− m b (x)] and gauge covariantly coupled to an external U(1) gauge field they found that for a = b the induced gauge field… (More)

- K. Scharnhorst
- 1996

Within Euclidean lattice field theory an exact equivalence between the one-flavour 2D Thirring model with Wilson fermions and Wilson parameter r = 1 to a two-colour loop model on the square lattice is established. For noninteracting fermions this model reduces to an exactly solved loop model which is known to be a free fermion model. The two-colour loop… (More)

- K. Scharnhorst
- 1993

Based on a methodological analysis of the effective action approach certain conceptual foundations of quantum field theory are reconsidered to establish a quest for an equation for the effective action. Relying on the functional integral formulation of Lagrangian quantum field theory a functional integral equation for the complete effective action is… (More)

- K. Scharnhorst
- 1984

The present study introduces and investigates a new type of equation which is called Grassmann integral equation in analogy to integral equations studied in real analysis. A Grassmann integral equation is an equation which involves Grassmann (Berezin) integrations and which is to be obeyed by an unknown function over a (finite-dimensional) Grassmann algebra… (More)

- K. Scharnhorst
- 2000

We show that Clifford algebras are closely related to the study of isoclinic subspaces of spinor spaces and, consequently, to the Hurwitz-Radon matrix problem. Isocliny angles are introduced to parametrize gamma matrices, i.e., matrix representations of the generators of finite-dimensional Clifford algebras C(m,n). Restricting the consideration to the… (More)

- K. Scharnhorst
- 1995

Some time ago Salmhofer demonstrated the equivalence of the strong coupling lattice Schwinger model withWilson fermions to a certain 8-vertex model which can be understood as a self-avoiding loop model on the square lattice with bending rigidity η = 1/2 and monomer weight z = (2κ)−2. The present paper applies two approximate analytical methods to the… (More)

- K. Scharnhorst
- 2008

4 × 4 Dirac (gamma) matrices (irreducible matrix representations of the Clifford algebras C(3,1), C(1,3), C(4,0)) are an essential part of many calculations in quantum physics. Although the final physical results do not depend on any particular representation of the Dirac matrices (e.g. due to the invariance of traces of products of Dirac matrices), the… (More)

- K. Scharnhorst
- 1996

In this paper a method previously employed by Salmhofer to establish an exact equivalence of the one-flavour strong coupling lattice Schwinger model with Wilson fermions to some 8-vertex model is applied to the case with two flavours. As this method is fairly general and can be applied to strong coupling QED and purely fermionic models with any… (More)

- Klaus Scharnhorst
- Quantum Information & Computation
- 2013

Relying on a mathematical analogy of the pure states of the two-qubit system of quantum information theory with four-component spinors we introduce the concept of the intrinsic entanglement of spinors. To explore its physical sense we study the entanglement capabilities of the spin representation of (pseudo-) conformal transformations in (3+1)dimensional… (More)

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