Constraints on time variation of fine structure constant from WMAP-3yr data
| dc.creator | Stefanescu, Petruta | |
| dc.date | 2007-07-02 | |
| dc.date.accessioned | 2026-07-07T11:17:24Z | |
| dc.date.available | 2026-07-07T11:17:24Z | |
| dc.description | This paper presents the constraints on the time variation of the fine structure constant at recombination relative to its present value, Delta_alpha = (alpha_rec-alpha_0) / alpha_0, obtained from the analysis of the WMAP-3yr Cosmic Microwave Background (CMB) data, with an additional prior on the Hubble expansion rate from HST Hubble Key Project. I found out that -0.039 < Delta_alpha < 0.010 at 95% C.L., which brings a 30% improvement to the previous limits from WMAP-1yr data. The corresponding recombination redshift, 1012 < z_rec < 1115, shows a delayed recombination epoch compared with the results from WMAP-1yr data. | |
| dc.description | 11 pages, 3 figures; accepted for publication in New Astronomy, June 02 2007 | |
| dc.identifier | https://arxiv.org/abs/0707.0190 | |
| dc.identifier | http://arxiv.org/abs/0707.0190 | |
| dc.identifier | NewAstron.12:635-640,2007 | |
| dc.identifier | doi:10.1016/j.newast.2007.06.004 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/192995 | |
| dc.subject | Astrophysics | |
| dc.title | Constraints on time variation of fine structure constant from WMAP-3yr data | |
| dc.type | text |