WMAP 5-year constraints on time variation of $\alpha$ and $m_e$ in a detailed recombination scenario

Abstract

We study the role of fundamental constants in an updated recombination scenario. We focus on the time variation of the fine structure constant, and the electron mass in the early Universe, and put bounds on these quantities by using data from CMB including WMAP 5-yr release and the 2dFGRS power spectrum. We analyze how the constraints are modified when changing the recombination scenario.

11 pages, accepted for publication in Physics Letters B

References in corpus (8)

• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Temperature Analysis
• How well do we understand cosmological recombination?
• Primordial helium recombination I: feedback, line transfer, and continuum opacity
• Rapid HeII->HeI recombination and radiation concerned with this process
• Primordial helium recombination III: Thomson scattering, isotope shifts, and cumulative results
• CMB constraints on the fine structure constant
• Primordial helium recombination II: two-photon processes

Cited by in corpus (4)

• Cosmology with varying fundamental constants from hyperlight, coupled scalars
• Constraining Variations in the Fine Structure Constant in the presence of Early Dark Energy
• Varying couplings in the early universe: correlated variations of $\alpha$ and $G$
• Impact of the matter density uncertainty on the dark energy reconstruction