Using the acoustic peak to measure cosmological parameters

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Abstract
Recent measurements of the cosmic microwave background radiation by the Boomerang experiment indicate that the universe is spatially flat. Here some simple back-of-the-envelope calculations are used to explain their result. The main result is a simple formula for the angular scale of the acoustic peak in terms of the standard density parameters: theta = 0.62^o [1+(Omega_0-1)/2 + Omega_Lambda/14].

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