Yale Postdoctoral Trainees

NPA Seminar: Nickolas Kokron, Princeton, "Probing the S(igma)-8 tension at the onset of stage-IV cosmic surveys"

In 1970, Allan Sandage famously described Cosmology as “A search for two numbers”. In the half-century since that description of the field was penned, as Stage III cosmic surveys come to an end and Stage-IV surveys begin taking data, the field finds itself having measured the six parameters of the concordance ΛCDM model at nearly 1% precision. However, different experiments now report different values for two of these parameters – namely the Hubble Constant and the variance of dark matter density fluctuations, S(igma) 8 – at varying levels of significance.

NPA Seminar: Adriaan Duivenvoorden, Flatiron Institute; Simons Foundation, "Cosmology from the fine details of the microwave sky with the Atacama Cosmology Telescope and the Simons Observatory"

Modern ground-based microwave observatories offer a high-resolution perspective on the cosmic microwave background (CMB) and its secondary components, complementing galaxy surveys and the low resolution CMB data from the Planck and WMAP satellites. In this talk, I will introduce two such observatories, the Atacama Cosmology Telescope (ACT) and the Simons Observatory. The ACT collaboration is preparing to release its sixth public data release. This release, DR6, is the result from a 6-year-long survey covering 40% of the sky at arcminute resolution.

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