Greybody factors of charged black holes with axion hair
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915795211124736 |
|---|---|
| author | Nakarachinda, Ratchaphat Boonserm, Petarpa De Felice, Antonio Tsujikawa, Shinji Wongjun, Pitayuth |
| author_facet | Nakarachinda, Ratchaphat Boonserm, Petarpa De Felice, Antonio Tsujikawa, Shinji Wongjun, Pitayuth |
| contents | We study the greybody factor of charged hairy black holes (BHs) that arise due to the presence of an axion coupled to the electromagnetic field. Specifically, we consider spin-0 and spin-1 test particles propagating in the background of BHs with axion hair, where the spacetime geometry is modified compared to that of the Reissner-Nordstrom (RN) BH. In contrast to the RN solution, with a given total BH charge, the effective potential for test particles depends on the ratio of electric to magnetic charges. In other words, charged BHs with axion hair breaks the electric-magnetic duality present in the RN solution. We compute the transmission coefficient of test particles plunging into the charged hairy BH and find that the deviation from the RN solution is particularly evident for higher multipole moments. Precise measurements of greybody factors can thus serve as probes for the possible existence of axions coupled to the electromagnetic field, as well as potential signatures of magnetic monopoles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_18241 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Greybody factors of charged black holes with axion hair Nakarachinda, Ratchaphat Boonserm, Petarpa De Felice, Antonio Tsujikawa, Shinji Wongjun, Pitayuth General Relativity and Quantum Cosmology We study the greybody factor of charged hairy black holes (BHs) that arise due to the presence of an axion coupled to the electromagnetic field. Specifically, we consider spin-0 and spin-1 test particles propagating in the background of BHs with axion hair, where the spacetime geometry is modified compared to that of the Reissner-Nordstrom (RN) BH. In contrast to the RN solution, with a given total BH charge, the effective potential for test particles depends on the ratio of electric to magnetic charges. In other words, charged BHs with axion hair breaks the electric-magnetic duality present in the RN solution. We compute the transmission coefficient of test particles plunging into the charged hairy BH and find that the deviation from the RN solution is particularly evident for higher multipole moments. Precise measurements of greybody factors can thus serve as probes for the possible existence of axions coupled to the electromagnetic field, as well as potential signatures of magnetic monopoles. |
| title | Greybody factors of charged black holes with axion hair |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2506.18241 |