Ami Choi (OSU Physics)
Accurate Cosmology with Near-Infrared Detectors
The Wide Field Infrared Survey Telescope (WFIRST) is an upcoming NASA observatory that willinvestigate the origins of cosmic acceleration using weak gravitational lensing. WFIRST willperform galaxy shape measurements using Teledyne H4RG-10 infrared devices; thus it isessential to understand inter-pixel non-linear effects like the brighter-fatter effect (BFE) andnon-linear inter-pixel capacitance (NL-IPC) that can cause systematic errors in the lensinganalysis. The non-destructive readout capability of the H4RG-10 detectors enables correlationmeasurements on flat field data not only between pixels but also between time frames. I willpresent recent efforts to characterize prototype WFIRST detectors and discuss the pathforward towards controlling measurement systematics and producing exciting and accuratecosmological constraints in the 2020s.