My Research at the Jet Propulsion Institute
I worked under Dr. Jason Rhodes and Dr. Tim Eifler at the Jet Propulsion Laboratory in the Caltech SURF Program. Our project was to create a pipeline to combine the constraining power of two types of cosmological data - the Cosmic Microwave Background and gravitational lensing - in order to get better bounds on cosmological parameters . A more technical description is below, and the full paper can be found here.
The CMB allows for a powerful probe of early universe physics. Given background cosmology the angular power spectrum can be computed to high accuracy with linear perturbation theory). This allows for tight constraints on cosmological parameters. The latest and most precise measurements of CMB anisotropies come from Planck, and are reported in Planck Collaboration et al. (2013). Since the first measurements of cosmic shear it has become a powerful tool for probing cosmological parameters. It is particularly powerful at constraining the time evolution of dark energy, dark matter density, and power spectrum amplitude. Thus, it is strongly complementary to CMB data, which has strong constraints on early universe time conditions. Many lensing surveys are currently being carried out, such as the Dark Energy Survey or planned for the near future, including the Large Synoptic Survey Telescope(LSST), Euclid, and Wide-Field Infrared Survey Telescope(WFIRST). These surveys also range from deeper and narrower, such as WFIRST, to more broad, LSST and EUCLID. The focus of this paper is to integrate these two powerful and complementary sources of cosmological information, the CMB and gravitational lensing, using the most constraining data sets (Planck, LSST/WFIRST/EUCLID) and the newest cosmological analysis pipelines (CLASS, CosmoLike). We first present a re-analysis of Planck data using the CLASS code, and then move on to forecasting constraining power of future surveys. We analyze comparisons of constraining power of our joint analysis framework versus probes using CLASS or CosmoLike only.