July 21, 2015 | 1:00 PM | LASR Conference Room | Open Group seminar Modeling and measuring CMB lensing in the cross-correlation era Giulio Fabbian, SISSA-Trieste
Being less sensitive to systematic effects, the cross-correlations between Cosmic Microwave Background (CMB) data sets and large-scale structures surveys are expected to provide excellent astrophysical and cosmological constraints in the upcoming years. In order to capitalize on the advantages offered by these joint analysis techniques, an accurate physical modeling of both the observables involved is required. I will present recent numerical results on CMB lensing simulations aiming at including effects of non-linear evolution of large-scale structures beyond the Born approximation on large fraction of the sky. If time allows, I will also discuss the status of the POLARBEAR experiment and its upgrade, the Simons Array, which will provide one of the best CMB data set for cross-correlation studies.
August 6, 2015 | 2:00 PM | LASR Conference Room | Open Group seminar The invisible landscape - Weak lensing mass maps with the Dark Energy Survey and beyond Chihway Chang, ETH Zurich
Our view of the Universe is distorted due to gravitational lensing. These distortions help us understand the content and history of the Universe. In this talk I will describe our recent work where we used the Dark Energy Survey Science Verification data to make a large weak lensing mass map of a slice of our Universe. I then discuss a variety of topics that can be investigated with these maps and in combination with other cosmological maps. As we look forward to the completion of current surveys and more ambitious future surveys coming online, these explorations would allow us to take a new look at the invisible landscape of our Universe.