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- · arXiv e-print (arXiv:0904.1612)
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| Title: |
| Dark Matter Constraints from a Cosmic Index of Refraction |
| Authors: |
| Gardner, S.; Latimer, D. |
| Publication: |
| eprint arXiv:0904.1612 |
| Publication Date: |
| 04/2009 |
| Origin: |
| ARXIV |
| Keywords: |
| High Energy Physics - Phenomenology, Astrophysics - Cosmology and Extragalactic Astrophysics, Nuclear Theory |
| Comment: |
| 9 pages, LaTeX, 1 figure |
| Bibliographic Code: |
| 2009arXiv0904.1612G |
Abstract
The dark-matter candidates of particle physics invariably possess electromagnetic interactions, if only via quantum fluctuations. Taken en masse, dark matter can thus engender an index of refraction which deviates from its vacuum value. Its presence is signaled through frequency-dependent effects: the real part yields dispersive effects in propagation, and the imaginary part yields such in attenuation. We discuss theoretical constraints on the expansion of the index of refraction with frequency, the physical interpretation of the terms, and the particular observations needed to isolate its coefficients. This, with the advent of new opportunities to view gamma-ray bursts at cosmological distance scales, gives us a new probe of dark matter. As a first application we use the time delay determined from radio afterglow observations of gamma-ray bursts to limit the charge-to-mass ratio of dark matter to |\epsilon/M|<>
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