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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2010
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v517_n9_p_Landau http://hdl.handle.net/20.500.12110/paper_00046361_v517_n9_p_Landau |
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paper:paper_00046361_v517_n9_p_Landau2023-06-08T14:27:53Z Constraints on variation in α and m e from WMAP 7-year data Cosmic background radiation Cosmological parameters Early Universe Cosmic ray measurement Monolithic microwave integrated circuits Radiation Cosmic background radiation Cosmological parameters Data sets Early universe Electron mass Fine structure constants Sloan Digital Sky Survey Statistical analysis Time variations Cosmology 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. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v517_n9_p_Landau http://hdl.handle.net/20.500.12110/paper_00046361_v517_n9_p_Landau |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Cosmic background radiation Cosmological parameters Early Universe Cosmic ray measurement Monolithic microwave integrated circuits Radiation Cosmic background radiation Cosmological parameters Data sets Early universe Electron mass Fine structure constants Sloan Digital Sky Survey Statistical analysis Time variations Cosmology |
| spellingShingle |
Cosmic background radiation Cosmological parameters Early Universe Cosmic ray measurement Monolithic microwave integrated circuits Radiation Cosmic background radiation Cosmological parameters Data sets Early universe Electron mass Fine structure constants Sloan Digital Sky Survey Statistical analysis Time variations Cosmology Constraints on variation in α and m e from WMAP 7-year data |
| topic_facet |
Cosmic background radiation Cosmological parameters Early Universe Cosmic ray measurement Monolithic microwave integrated circuits Radiation Cosmic background radiation Cosmological parameters Data sets Early universe Electron mass Fine structure constants Sloan Digital Sky Survey Statistical analysis Time variations Cosmology |
| description |
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. |
| title |
Constraints on variation in α and m e from WMAP 7-year data |
| title_short |
Constraints on variation in α and m e from WMAP 7-year data |
| title_full |
Constraints on variation in α and m e from WMAP 7-year data |
| title_fullStr |
Constraints on variation in α and m e from WMAP 7-year data |
| title_full_unstemmed |
Constraints on variation in α and m e from WMAP 7-year data |
| title_sort |
constraints on variation in α and m e from wmap 7-year data |
| publishDate |
2010 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v517_n9_p_Landau http://hdl.handle.net/20.500.12110/paper_00046361_v517_n9_p_Landau |
| _version_ |
1768541873314463744 |