On the Chirality of a Discrete Dirac–Kähler Equation

Abstract

We discuss a discrete analogue of the Dirac-K\"{a}hler equation in which chiral properties of the continual counterpart are captured. We pay special attention to a discrete Hodge star operator. To build one a combinatorial construction of double complex is used. We describe discrete exterior calculus operations on a double comlex and obtain the discrete Dirac-K\"{a}hler equation using these tools. Self-dual and anti-self-dual discrete inhomogeneous forms are presented. The chiral invariance of the massless discrete Dirac-K\"{a}hler equation is shown. Moreover, in the massive case we prove that a discrete Dirac-K\"{a}hler operator flips the chirality.