The Anomalous Magnetic Moment of a Photon Propagating in a Magnetic Field

We analyze the spectrum of the Hamiltonian of a photon propagating in a strong magnetic field $B\sim B_{\mathrm{c}\mathrm{r}}$, where $B_{\rm cr}= \frac{m^2}{e} \simeq 4.4 \times 10^{13}$ Gauss is the Schwinger critical field . We show that the expected value of the Hamiltonian of a quantized photon for a perpendicular mode is a concave function of the magnetic field $B$. We show by a partially analytic and numerical method that the anomalous magnetic moment of a photon in the one loop approximation is a non - decreasing function of the magnetic field $B$ in the range $0\le B\le 30B_{\mathrm{c}\mathrm{r}}$ We provide a numerical representation of the expression for the anomalous magnetic moment in terms of special functions. We find that the anomalous magnetic moment ${\mu }_{\gamma }$ of a photon for $B=30B_{\mathrm{c}\mathrm{r}}$ is $8\mathrm{/}3$ of the anomalous magnetic moment of a photon for $B=1\mathrm{/}2B_{\mathrm{c}\mathrm{r}}$.