From: Cosimo Bambi [view email]
[v1] Fri, 4 Feb 2022 13:18:49 UTC (2,405 KB)
[v2] Sun, 10 Sep 2023 14:19:13 UTC (2,422 KB)
Title: Observational appearance of Kaluza-Klein black holes
Abstract: The optical properties of rotating black holes in Kaluza-Klein theory described by the total mass, spin, and electric and magnetic charges are investigated in detail. Using a developed general relativistic ray-tracing code to calculate the motion of photons, the numerous shadows of Kaluza-Klein black holes are generated. The properties of the black hole shadow and the light deflection angle around these black holes are also studied in order to put constraints on the parameters of Kaluza-Klein black holes using M87* shadow observations. The possibility of imposing constraints on Kaluza-Klein black holes using shadow observations is investigated. Moreover, we find that small charges (electric and magnetic) of the black hole can meet these constraints. We conclude that with the current precision of the M87* black hole shadow image observation by the EHT collaboration, the shadow observations of Kaluza-Klein black holes are indistinguishable from that of the Kerr black hole. Much better observational accuracy than the current capabilities of the EHT collaboration are required in order to place verified constraints on the parameters of modified theories of gravity in the strong field regime.
| Comments: | 13 pages, 9 figures. v2: refereed version |
| Subjects: | General Relativity and Quantum Cosmology (gr-qc) |
| Cite as: | arXiv:2202.02122 [gr-qc] |
| (or arXiv:2202.02122v2 [gr-qc] for this version) | |
| https://doi.org/10.48550/arXiv.2202.02122 |
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DOI(s) linking to related resources
12 – Appearance Prejudice and Discrimination against Black Women
Appearance Prejudice and Discrimination against Black Women discusses Black women’s substantive experiences of discrimination based on their appearance. Black women experience biases around body features, skin color, hair, personal grooming choices, and other appearance-related variables. Black women also receive constant messages about how they do not meet mainstream beauty standards. These messages may cause women to internalize negative self-images. We offer therapists strategies to support Black women to deconstruct beauty stereotypes and foster cultural beauty ideals to help manage and reject societal invalidations.
Type Chapter
Information
What Practitioners Should Know and Do
, pp. 288 – 308
Publisher: Cambridge University Press
Print publication year: 2023
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