Approximating the Likelihood Function of CMB Experiments
Bartlett, J. G. · Blanchard, A. · Douspis, M. · Dour, M. Le
Original · EN
We discuss the problem of constraining cosmological parameters with cosmic microwave background band--power estimates. Because these latter are variances, they do not have gaussian distribution functions and, hence, the standard χ²--approach is not strictly applicable. A general purpose approximation to experimental band--power likelihood functions is proposed, which requires only limited experimental details. Comparison with the full likelihood function calculated for several experiments shows that the approximation works well.
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