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**Dirac Hamiltonian with Imaginary Mass and Induced Helicity—Dependence by Indefinite Metric** ()

It is of general theoretical interest to investigate the properties of superluminal matter wave equations for spin one-half particles. One can either enforce superluminal propagation by an explicit substitution of the real mass term for an imaginary mass, or one can use a matrix representation of the imaginary unit that multiplies the mass term. The latter leads to the tachyonic Dirac equation, while the equation obtained by the substitution

*m**im*in the Dirac equation is naturally referred to as the imaginary-mass Dirac equation. Both the tachyonic as well as the imaginary-mass Dirac Hamiltonians commute with the helicity operator. Both Hamiltonians are pseudo-Hermitian and also possess additional modified pseudo-Hermitian properties, leading to constraints on the resonance eigenvalues. Here, by an explicit calculation, we show that specific sum rules over the The spectrum is found to consist of well-defined real energy eigenvalues and complex resonance and anti-resonance energies. In the quantized imaginary-mass Dirac field, one-particle states of right-handed helicity acquire a negative norm (“indefinite metric”) and can be excluded from the physical spectrum by a Gupta-Bleuler type condition.Keywords

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U. Jentschura, "Dirac Hamiltonian with Imaginary Mass and Induced Helicity—Dependence by Indefinite Metric,"

*Journal of Modern Physics*, Vol. 3 No. 9, 2012, pp. 887-894. doi: 10.4236/jmp.2012.39116.Conflicts of Interest

The authors declare no conflicts of interest.

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