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Dilute axion stars converting to photons in the Milky Way's magnetic field.
- Source :
- Journal of High Energy Physics; Dec2023, Vol. 2023 Issue 12, p1-13, 13p
- Publication Year :
- 2023
-
Abstract
- In this paper we examine the possibility of dilute axion stars converting to photons in the weak, large-scale magnetic field of the Milky Way and show that they can resonate with the surrounding plasma and produce a sizable signal. We consider two possibilities for the plasma: free electrons and HII regions. In the former case, we argue that the frequency of the photons will be too small to be observed even by space-based radio telescopes. In the latter case, their frequency is larger, safely above the solar wind cut-off. We provide an estimate of the flux as a function of the decay constant and show that for f<subscript>a</subscript>< 2 × 10<superscript>11</superscript> GeV, the signal will be above the radio emission of the solar system's planets and it could potentially be detected by the NCLE instrument which is on board the Chang'e-4 spacecraft. Finally, we calculate the time scale of decay of the axion star and demonstrate that back-reaction can be neglected for all physically interesting values of the decay constant, while the minimum time scale of decay is in the order of a few hours. [ABSTRACT FROM AUTHOR]
- Subjects :
- AXIONS
STARS
MILKY Way
MAGNETIC fields
PHOTONS
DECAY constants
SOLAR radio emission
Subjects
Details
- Language :
- English
- ISSN :
- 11266708
- Volume :
- 2023
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Journal of High Energy Physics
- Publication Type :
- Academic Journal
- Accession number :
- 174834750
- Full Text :
- https://doi.org/10.1007/JHEP12(2023)164