Photon emissions from near-horizon extremal and near-extremal Kerr equatorial emitters
| العنوان: | Photon emissions from near-horizon extremal and near-extremal Kerr equatorial emitters |
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| المؤلفون: | Bin Chen, Minyong Guo, Zezhou Hu, Haopeng Yan |
| المصدر: | Physical Review D. 104 |
| بيانات النشر: | American Physical Society (APS), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Physics, Photon, Horizon (archaeology), Physics::Accelerator Physics, FOS: Physical sciences, Astrophysics::Earth and Planetary Astrophysics, General Relativity and Quantum Cosmology (gr-qc), Astrophysics, General Relativity and Quantum Cosmology |
| الوصف: | We consider isotropic and monochromatic photon emissions from equatorial emitters moving along future-directed timelike geodesics in the near-horizon extremal Kerr (NHEK) and near-horizon near-extremal Kerr (near-NHEK) regions, to asymptotic infinity. We obtain numerical results for the photon escaping probability (PEP) and derive analytical expressions for the maximum observable blueshift (MOB) of the escaping photons, both depending on the emission radius and the emitter's proper motion. In particular, we find that for all anti-plunging or deflecting emitters that can eventually reach to asymptotic infinity, the PEP is greater than $50\%$ while for all plunging emitters the PEP is less than $55\%$, and for the bounded emitters in the (near-)NHEK region, the PEP is always less than $59\%$. In addition, for the emitters on unstable circular orbits in the near-NHEK region, the PEP decreases from $55\%$ to $50\%$ as the orbital radius decreases from the one of the innermost stable circular orbit to the one of the horizon. Furthermore, we show how the orientation of the emitter's motion along the radial or azimuthal direction affects the PEP and the MOB of the emitted photons. Comment: Slight change in title, matched the published version in PRD |
| تدمد: | 2470-0029 2470-0010 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a989026c3ab252b56e6a97360cf4a9e1 https://doi.org/10.1103/physrevd.104.124005 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....a989026c3ab252b56e6a97360cf4a9e1 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24700029 24700010 |
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