Inverted Dirac oscillator

• URL: http://arxiv.org/abs/2606.15303v1
• Date: Sat, 13 Jun 2026 13:50:13 GMT
• Title: Inverted Dirac oscillator
• Abstract summary: Dirac oscillator is obtained from the Dirac Hamiltonian $HmathrmD = left( cveccdot vecp + mc2right)$ by modifying the momentum through a non-Hermitian substitution.<n>We show that the Hamiltonian $Hmathrmr$ is a pseudo-$mathcalPT$-symmetric operator.
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• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The Dirac oscillator is obtained from the Dirac Hamiltonian $H^{\mathrm{D}} = \left( c\vecα\cdot \vec{p} + mc^{2}β\right)$ by modifying the momentum through a non-Hermitian substitution $\overrightarrow{p} \rightarrow \overrightarrow{p} \pm iωβ\overrightarrow{q}$. Despite the non-Hermitian nature of this momentum operator, the full Hamiltonian remains Hermitian due to the presence of the Dirac matrix $\vecα$. However, if one instead introduces a Hermitian modification of the form $\vec{p} \rightarrow \vec{p} \pm ωβ\overrightarrow{q}$, the resulting Hamiltonian is no longer Hermitian. In this case, the system corresponds to an inverted Dirac oscillator $H^{\mathrm{r}}$, where the potential becomes unbounded from below, the energy spectrum becomes continuous, and the eigenfunctions fail to be square-integrable, leading to normalization difficulties. We show that the Hamiltonian $H^{\mathrm{r}}$ is a pseudo-$\mathcal{PT}$-symmetric operator, and we introduce an unbounded, non-unitary transformation that establishes a connection between $H^{\mathrm{r}}$ and $H^{\mathrm{D}}$. The purpose of this work is to analyze this relativistic quantum system -- known as the Dirac inverted oscillator -- which, despite its various applications, admits an exact analytical solution

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