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| joint [2020/02/13 11:00] – marta | joint [2020/10/05 16:37] – [Seminar calendar] gomez-valent | ||
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| ====Seminar calendar==== | ====Seminar calendar==== | ||
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| + | __**Summer term 20:**__ | ||
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| + | This discussion is based [[ https:// | ||
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| + | == 8th July 2020: Selected topics in theory and observations of Dark Energy (Tunch) == | ||
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| + | Adrià Gómez-Valent - Boosting MonteCarlo sampling with a non-Gaussian fit | ||
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| + | We propose a new method, called MonteCarlo Posterior Fit, to boost the MonteCarlo sampling of likelihood (posterior) functions. The idea is to approximate the posterior function by an analytical multidimensional non-Gaussian fit. The many free parameters of this fit can be obtained by a smaller sampling than is needed to derive the full numerical posterior. In the examples that we consider, based on supernovae and cosmic microwave background data, we find that one needs an order of magnitude smaller sampling than in the standard algorithms to achieve comparable precision. This method can be applied to a variety of situations and is expected to significantly improve the performance of the MonteCarlo routines in all the cases in which sampling is very time-consuming. Finally, it can also be applied to Fisher matrix forecasts, and can help solve various limitations of the standard approach. | ||
| __**Winter term 19/20:**__ | __**Winter term 19/20:**__ | ||
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| == 20th February 2020: Selected topics in theory and observations of Dark Energy (Tunch) == | == 20th February 2020: Selected topics in theory and observations of Dark Energy (Tunch) == | ||
| - | TBA | + | Cancelled. |
| == 13th February 2020: Journal Club == | == 13th February 2020: Journal Club == | ||