Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-17
Phys.Rev. D71 (2005) 123510
Astronomy and Astrophysics
Astrophysics
7 pages RevTeX4 with 7 figures. Updated to match version accepted by PRD. Calculations extended to sixth-order and extra clari
Scientific paper
10.1103/PhysRevD.71.123510
While inflation gives an appealing explanation of observed cosmological data, there are a wide range of different inflation models, providing differing predictions for the initial perturbations. Typically models are motivated either by fundamental physics considerations or by simplicity. An alternative is to generate large numbers of models via a random generation process, such as the flow equations approach. The flow equations approach is known to predict a definite structure to the observational predictions. In this paper, we first demonstrate a more efficient implementation of the flow equations exploiting an analytic solution found by Liddle (2003). We then consider alternative stochastic methods of generating large numbers of inflation models, with the aim of testing whether the structures generated by the flow equations are robust. We find that while typically there remains some concentration of points in the observable plane under the different methods, there is significant variation in the predictions amongst the methods considered.
Liddle Andrew R.
Ramirez Erandy
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