|
| | | | |
| | | |
| Stat |
Members: 3630
Articles: 2'379'978
Articles rated: 2603
01 October 2023 |
|
| | | | |
|
Article overview
| |
|
|
Measuring $alpha$ in the Early Universe: CMB Temperature, Large-Scale Structure and Fisher Matrix Analysis | | C.J.A.P. Martins
; A. Melchiorri
; R. Trotta
; R. Bean
; G. Rocha
; P.P. Avelino
; P.T.P. Viana
; | | Date: |
10 Mar 2002 | | Journal: | Phys.Rev. D66 (2002) 023505 | | Subject: | astro-ph gr-qc hep-ph hep-th | | Affiliation: | CAUP, Cambridge, IAP), A. Melchiorri (Oxford), R. Trotta (Geneva), R. Bean (Imperial College), G. Rocha (Cambridge), P.P. Avelino (CAUP) and P.T.P. Viana (CAUP | | Abstract: | We extend our recent work on the effects of a time-varying fine-structure constant $alpha$ in the cosmic microwave background, by providing a thorough analysis of the degeneracies between $alpha$ and the other cosmological parameters, and discussing ways to break these with both existing and/or forthcoming data. In particular, we present the state-of-the-art CMB constraints on $alpha$, through a combined analysis of the BOOMERanG, MAXIMA and DASI datasets. We also present a novel discussion of the constraints on $alpha$ coming from large-scale structure observations, focusing in particular on the power spectrum from the 2dF survey. Our results are consistent with no variation in $alpha$ from the epoch of recombination to the present day, and restrict any such (relative) variation to be less than about 4%. We show that the forthcoming MAP and (particularly) Planck experiments will be able to break most of the currently existing degeneracies between $alpha$ and other parameters, and measure $alpha$ to better than percent accuracy. | | Source: | arXiv, astro-ph/0203149 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser CCBot/2.0 (https://commoncrawl.org/faq/)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER