Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/30121
Title: | Bending of light in axion backgrounds |
Author: | McDonald, Jamie I. Ventura, Luís B. |
Issue Date: | 2020 |
Publisher: | American Physical Society |
Abstract: | In this work we examine refraction of light by computing full solutions to axion electrodynamics.
We also allow for the possibility of an additional plasma component. We then specialise to wavelengths which are small compared to background scales to determine if refraction can be described
by geometric optics. In the absence of plasma, for small incidence angles relative to the optical
axis, axion electrodynamics and geometric optics are in good agreement, with refraction occurring
at O(g
2
aγγ). However, for rays which lie far from the optical axis, the agreement with geometric
optics breaks down and the dominant refraction requires a full wave-optical treatment, occurring at
O(gaγγ). In the presence of sufficiently large plasma masses, the wave-like nature of light becomes
suppressed and geometric optics is in good agreement with the full theory for all rays. Our results
therefore suggest the necessity of a more comprehensive study of lensing and ray-tracing in axion
backgrounds, including a full account of the novel O(gaγγ) wave-optical contribution to refraction. In this work we examine refraction of light by computing full solutions to axion electrodynamics. We also allow for the possibility of an additional plasma component. We then specialise to wavelengths which are small compared to background scales to determine if refraction can be described by geometric optics. We also allow for the possibility of an additional plasma component. In the absence of plasma, for small incidence angles relative to the optical axis, axion electrodynamics and geometric optics are in good agreement, with refraction occurring at $\mathcal{O}(g_{a \gamma \gamma}^2)$. However, for rays which lie far from the optical axis, the agreement with geometric optics breaks down and the dominant refraction requires a full wave-optical treatment, occurring at $\mathcal{O}(g_{a \gamma \gamma})$. In the presence of sufficiently large plasma masses, the wave-like nature of light becomes suppressed and geometric optics is in good agreement with the full theory for all rays. Our results therefore suggest the necessity of a more comprehensive study of lensing and ray-tracing in axion backgrounds, including a full account of the novel $\mathcal{O}(g_{a \gamma \gamma})$ wave-optical contribution to refraction. |
Peer review: | no |
URI: | http://hdl.handle.net/10773/30121 |
ISSN: | 2470-0010 |
Appears in Collections: | CIDMA - Artigos DFis - Artigos GGDG - Artigos |
Files in This Item:
File | Description | Size | Format | |
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paper2708.pdf | 767.39 kB | Adobe PDF | View/Open |
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