Constraints on variation in α and m e from WMAP 7-year data

Aims. We update the constraints on the time variation of the fine structure constant α and the electron mass me, using the latest CMB data, including the 7-yr release of WMAP. Methods. We made statistical analyses of the variation of each one of the constants and of their joint variation, together w...

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Detalles Bibliográficos
Autores principales: Landau, S.J., Scóccola, G.
Formato: JOUR
Materias:
Cosmic background radiation
Cosmological parameters
Early Universe
Cosmic ray measurement
Monolithic microwave integrated circuits
Radiation
Data sets
Early universe
Electron mass
Fine structure constants
Sloan Digital Sky Survey
Statistical analysis
Time variations
Cosmology
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046361_v517_n9_p_Landau
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Aims. We update the constraints on the time variation of the fine structure constant α and the electron mass me, using the latest CMB data, including the 7-yr release of WMAP. Methods. We made statistical analyses of the variation of each one of the constants and of their joint variation, together with the basic set of cosmological parameters. We used a modified version of CAMB and COSMOMC to account for these possible variations. Results. We present bounds on the variation of the constants for different data sets, and show how results depend on them. When using the latest CMB data plus the power spectrum from Sloan Digital Sky Survey LRG, we find that α/α0 = 0.986 ± 0.007 at 1-σ level, when the 6 basic cosmological parameters were fitted, and only variation in α was allowed. The constraints in the case of variation of both constants are α/α0 = 0.986 ± 0.009 and me/me0 = 0.999 ± 0.035. In the case of only variation in me, the bound is me/m e0 = 0.964 ± 0.025. © 2010 ESO.

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