Cosmic concordance and the fine structure constant

Details Cosmic concordance and the fine structure constant Cosmic concordance and the fine structure constant

2000-08-17

arxiv.org/abs/astro-ph/0008265v1

Phys.Rev. D63 (2001) 043505

Astronomy and Astrophysics

Astrophysics

12 Pages

Scientific paper

10.1103/PhysRevD.63.043505

Recent measurements of a peak in the angular power spectrum of the cosmic microwave background appear to suggest that geometry of the universe is close to being flat. But if other accepted indicators of cosmological parameters are also correct then the best fit model is marginally closed, with the peak in the spectrum at larger scales than in a flat universe. Such observations can be reconciled with a flat universe if the fine structure constant had a lower value at earlier times, which would delay the recombination of electrons and protons and also act to suppress secondary oscillations as observed. We discuss evidence for a few percent increase in the fine structure constant between the time of recombination and the present.

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