Probing a polymerized black hole with the frequency shifts of photons

As is well-known, black hole plays an important role in probing the quantum effects of gravity in the strong-field regime. In this paper, we focus on a polymerized black hole and investigate the quantum effects on the redshift, blueshift, and gravitational redshift of photons emitted by massive particles revolving around this black hole. With a general relativistic formalism, we obtain two elegant and concise expressions for the mass of the black hole and the quantum parameter in terms of few direct observables, and find that all the frequency shifts of photons decrease with the quantum parameter. By expanding the total frequency shift for large orbit of the emitter, low peculiar redshift, and small azimuthal angle, we find that the leading contributions to the frequency shift are originated from the kinematic shift and peculiar shift, and the quantum effects make a negligible contribution. In addition, we study the effects of the plasma on the redshift/blueshift for the first time, and conclude that the presence of plasma results in the decrease of the redshift/blueshift.

Automated summary

In this paper, the quantum effects on the redshift, blueshift, and gravitational redshift of photons emitted by massive particles revolving around a polymerized black hole were investigated. Elegant and concise expressions for the mass of the black hole and the quantum parameter were obtained, and it was found that all the frequency shifts of photons decrease as the quantum parameter decreases. The leading contributions to the frequency shift were found to come from the kinematic shift and peculiar shift, while the quantum effects made a negligible contribution. Additionally, the effects of plasma on the redshift/blueshift were studied for the first time, and it was concluded that the presence of plasma results in a decrease in the redshift/blueshift.