SecondPeriodProjectB11 - TransRegio

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Analysis and Forecasts for Large-Scale Dark Energy Surveys

Principal Investigators: L. Amendola (Heidelberg), C. Porciani (Bonn) J. Weller (Munich)


We are currently entering an era of large scale structure surveys, which are designed to test cosmological models and probe the nature of Dark Energy. This requires on the one hand the development of careful and dedicated analysis methods to test specifically for a large range of models of cosmic acceleration and on the other hand to implement the understanding we have of these models into the design of future surveys and satellite missions. In this project we concentrate on efforts to constrain cosmological models which exploits the statistics of the large scale matter distribution and the growth of the large scale structure over time.

Next-generation large-scale surveys for Dark Energy will collect large amount of data, redshifts and ellipticities for hundred of millions of galaxies. In order to extract the maximal amount of cosmological information, the experimental design needs to be optimized by tuning the best combinations of depth, width, and sensitivity. With this project, we will forecast the performance of future surveys and analyze current datasets. It is likely that future breakthroughs come from a combination of different methods, in particular baryon acoustic oscillations, redshift distortions, cosmic shear and cluster observations, in addition to the cosmic microwave background. The forecasting and analysis problem is amplified by the need to take into account all the correlation among these datasets, since they measure related quantities. An honest analysis requires the investigation of the full correlation matrix of these probes. The full correlations could bear extra information and hence tighten the constraints on Dark Energy, and could also suggest new ways to optimize the surveys.

Role within the Transregional Collaborative Research Centre

Teilprojekt B11 will be closely linked to the following other sections of the TRR33:

  • B5 (Weak Lensing and Constraints on the Dark-Energy Equation of State): One of the most promising probes to constrain Dark Energy is weak lensing. A close interaction of members of B11 with the B5 team will be extremly beneficial for a realistic implementation of the likelihoods.

  • B7 (Probing Dark Matter and Dark Energy with observations of the evolution and spatial distribution of galaxy clusters): The successful exploitation of galaxy clusters as cosmological probes relies on correlation with other probes. Hence the two teams will benefit tremendously from a close collaboration.

  • B14 (Large-scale structure and Dark Energy): Large-scale structure data coming galaxy surveys is one of the cornerstones of future Dark Energy probes. Hence we will closely work together with the B14 team to ensure realistic implementation of survey and physical effects, like non-linearities.

  • C3 (Dark Matter-Dark Energy interactions): the models that allow for an explicit interaction between dark components constitute a simple but phenomenologically rich extension of the standard cosmology; the new parameters introduced by the interaction will be included in the forecasts for future missions. The numerical simulations of interacting models will provide the non-linear corrections for the power spectrum.

  • C6 (The "Why Now" problem of Dark Energy): The project C6 will explore from a more theoretical perspective some of the non-standard models that will be studied in the present project, in particular the models with interacting components. This will contribute to focus on the most interesting models and on parameter ranges that are not ruled out by other considerations.

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