2010

Minimally Parametric Power Spectrum Reconstruction from the Lyman-alpha Forest

Bird, Simeon, Peiris, Hiranya V., Viel, Matteo et al.

Understand

Current results from the Lyman alpha forest assume that the primordial power spectrum of density perturbations follows a simple power law form, with running.

We present the first analysis of Lyman alpha data to study the effect of relaxing this strong assumption on primordial and astrophysical constraints.
We perform a large suite of numerical simulations, using them to calibrate a minimally parametric framework for describing the power spectrum.
Combined with cross-validation, a statistical technique which prevents over-fitting of the data, this framework allows us to reconstruct the power spectrum shape without strong prior assumptions.

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Then

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