Photon propagation in a cold axion background with and without magnetic field
A cold relic axion condensate resulting from vacuum misalignment in the early Universe oscillates with a frequency m , where m is the axion mass. We determine the properties of photons propagating in a simplified version of such a background where the sinusoidal variation is replaced by a square wav...
| Autores: | , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2012 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/131788 |
| Acceso en línea: | https://hdl.handle.net/2445/131788 |
| Access Level: | acceso abierto |
| Palabra clave: | Física de partícules Experiments Fotons Particle physics Photons |
| Sumario: | A cold relic axion condensate resulting from vacuum misalignment in the early Universe oscillates with a frequency m , where m is the axion mass. We determine the properties of photons propagating in a simplified version of such a background where the sinusoidal variation is replaced by a square wave profile. We prove that previous results, which indicated that charged particles moving fast in such a background radiate (originally derived assuming that all momenta involved were much larger than m ), hold for long wavelengths, too. We also analyze in detail how the introduction of a magnetic field changes the properties of photon propagation in such a medium. We briefly comment on possible astrophysical implications of these results. |
|---|