Bayesian model selection analysis of WMAP3

  title={Bayesian model selection analysis of WMAP3},
  author={David Parkinson and Pia Mukherjee and Andrew R. Liddle},
  journal={Physical Review D},
We present a Bayesian model selection analysis of WMAP3 data using our code CosmoNest. We focus on the density perturbation spectral index nS and the tensor-to-scalar ratio r, which define the plane of slow-roll inflationary models. We find that while the Bayesian evidence supports the conclusion that nS 6= 1, the data are not yet powerful enough to do so at a strong or decisive level. If tensors are assumed absent, the current odds are approximately 8 to 1 in favour of nS 6= 1 under our… Expand

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