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Looking for a varying $alpha$ in the Cosmic Microwave Background | | P.P. Avelino
; C.J.A.P. Martins
; G. Rocha
; P. Viana
; | | Date: |
29 Aug 2000 | | Journal: | Phys.Rev. D62 (2000) 123508 | | Subject: | astro-ph gr-qc hep-ph | | Affiliation: | CAUP and DF-FCUP, Porto), C.J.A.P. Martins (DAMTP, Cambridge and CAUP), G. Rocha (CAUP and Dep. Physics, Oxford) and P. Viana (CAUP and DMA-FCUP, Porto | | Abstract: | We perform a likelihood analysis of the recently released BOOMERanG and MAXIMA data, allowing for the possibility of a time-varying fine-structure constant. We find that in general this data prefers a value of $alpha$ that was smaller in the past (which is in agreement with measurements of $alpha$ from quasar observations). However, there are some interesting degeneracies in the problem which imply that strong statements about $alpha$ can not be made using this method until independent accurate determinations of $Omega_b h^2$ and $H_0$ are available. We also show that a preferred lower value of $alpha$ comes mainly from the data points around the first Doppler peak, whereas the main effect of the high-$ell$ data points is to increase the preferred value for $Omega_b h^2$ (while also tightening the constraints on $Omega_0$ and $H_0$). We comment on some implications of our results. | | Source: | arXiv, astro-ph/0008446 | | Services: | Forum | Review | PDF | Favorites | |
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