Variation of the fine structure constant in QSO spectra from coherent dark matter oscillations
| Autor: | R. Dick, K. E. Wunderle, M. G. Barnett |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
Physics
010308 nuclear & particles physics Astrophysics (astro-ph) Dark matter Planck mass FOS: Physical sciences Order (ring theory) Astronomy and Astrophysics Fine-structure constant Astrophysics Coupling (probability) 01 natural sciences Spectral line Space and Planetary Science 0103 physical sciences 010306 general physics Variation (astronomy) Scalar field Mathematical physics |
| Popis: | We consider the problem of the evolution of the fine structure coefficient alpha under the assumption that the scalar field coupling to the Maxwell term satisfies the condition mt>>1 for coherent dark matter oscillations. In this case we find that the coupling scale f in the leading order coupling -(phi/4f)F^2 affects the cosmological evolution of alpha according to ln(alpha/alpha_0) xi(m_{Pl}/f)ln(tanh(t/2 tau)/tanh(t_0/2 tau)). A fit to the QSO observations by Murphy et al. yields f/xi= 2.12^{+0.58}_{-0.37} 10^5m_{Pl}. Here m_{Pl} is the reduced Planck mass, and xi^2=rho_phi/rho_m parametrizes the contribution of phi to the matter density in the universe. 6 pages, accepted for publication in the MNRAS |
| Databáze: | OpenAIRE |
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