Planck intermediate results XXIV : Constraints on variations in fundamental constants

Show full item record



Permalink

http://hdl.handle.net/10138/233349

Citation

Ade , P A R , Keihänen , E , Kurki-Suonio , H , Suur-Uski , A -S , Valiviita , J & Planck Collaboration 2015 , ' Planck intermediate results XXIV : Constraints on variations in fundamental constants ' Astronomy & Astrophysics , vol. 580 , A22 . DOI: 10.1051/0004-6361/201424496

Title: Planck intermediate results XXIV : Constraints on variations in fundamental constants
Author: Ade, P. A. R.; Aghanim, N.; Arnaud, M.; Ashdown, M.; Aumont, J.; Baccigalupi, C.; Banday, A. J.; Barreiro, R. B.; Battaner, E.; Benabed, K.; Benoit-Levy, A.; Bernard, J. -P.; Bersanelli, M.; Bielewicz, P.; Bond, J. R.; Borrill, J.; Bouchet, F. R.; Burigana, C.; Butler, R. C.; Calabrese, E.; Chamballu, A.; Chiang, H. C.; Christensen, P. R.; Clements, D. L.; Colombo, L. P. L.; Couchot, F.; Curto, A.; Cuttaia, F.; Danese, L.; Davies, R. D.; Davis, R. J.; de Bernardis, P.; de Rosa, A.; de Zotti, G.; Delabrouille, J.; Diego, J. M.; Dole, H.; Dore, O.; Dupac, X.; Ensslin, T. A.; Eriksen, H. K.; Fabre, O.; Finelli, F.; Forni, O.; Frailis, M.; Franceschi, E.; Keihänen, E.; Kurki-Suonio, H.; Suur-Uski, A. -S.; Valiviita, J.
Contributor: University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Department of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
Date: 2015-08
Language: eng
Number of pages: 25
Belongs to series: Astronomy & Astrophysics
ISSN: 0004-6361
URI: http://hdl.handle.net/10138/233349
Abstract: Any variation in the fundamental physical constants, more particularly in the fine structure constant, a, or in the mass of the electron, me, affects the recombination history of the Universe and cause an imprint on the cosmic microwave background angular power spectra. We show that the Planck data allow one to improve the constraint on the time variation of the fine structure constant at redshift z - 10(3) by about a factor of 5 compared to WMAP data, as well as to break the degeneracy with the Hubble constant, H-0. In addition to a, we can set a constraint on the variation in the mass of the electron, me, and in the simultaneous variation of the two constants. We examine in detail the degeneracies between fundamental constants and the cosmological parameters, in order to compare the limits obtained from Planck and WMAP and to determine the constraining power gained by including other cosmological probes. We conclude that independent time variations of the fine structure constant and of the mass of the electron are constrained by Planck to Delta alpha/alpha = (3.6 +/- 3.7) x 10(-3) and Delta m(e)/m(e) = (4 +/- 11) x 10(-3) at the 68% confidence level. We also investigate the possibility of a spatial variation of the fine structure constant. The relative amplitude of a dipolar spatial variation in a (corresponding to a gradient across our Hubble volume) is constrained to be delta alpha/alpha = (-2.4 +/- 3.7) x 10(-2).
Subject: cosmology: observations
cosmic background radiation
cosmological parameters
atomic data
FINE-STRUCTURE CONSTANT
MICROWAVE BACKGROUND ANISOTROPIES
BARYON ACOUSTIC-OSCILLATIONS
TIME-VARIATION
PHYSICAL CONSTANTS
ANALYTIC APPROACH
HUBBLE CONSTANT
ALPHA
COSMOLOGY
UNIVERSE
115 Astronomy, Space science
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
aa24496_14.pdf 2.080Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record