Anqi Chen

Last Update 2023/08/29
I am a phenomenological cosmologist interested in the intersection of theory and observation. Specifically, I think the recently growing variety of the cosmological and astrophysical probes, including but not limited to the cosmic microwave background, galaxy clustering, weak lensing, 21 cm absorption, and Supernovae, could help enlighten the theorists about the direction where we should search for a unification of the quantum field theory and the general relativity. My research usually goes in a cycle between the observation and theory in this pattern: By staring at the recently published observation, I propose a phenomenological model to explain a part of the results. Then I carry out the calculation and the statistically robust analysis on this model against the combined probes. In the end it will deliver a fairly concrete verdict on the previous hypothesis, positive or negative.
I have been working in the Dark Energy Survey, so my expertise on the observational side is in the large scale structure probes. On the theory side, I am mostly interested in the primordial black hole as dark matter, decaying dark matter, and modified gravities.
My next project would be exploring the possibility of explaining the "lensing is low" problem by applying Gaussian process to the expansion history in the weak lensing and galaxy clustering surveys.
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