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Oliver H.E. Philcox (Princeton) ” Large Scale Structure Beyond the 2-Point Function”

November 23, 2021 @ 12:00 pm - 1:00 pm

Abstract:

Quantum fluctuations in inflation provide the seeds for the large scale distribution of matter today. According to the standard paradigm, these fluctuations induce density perturbations that are Gaussian distributed. In this limit, all the information is contained within the pairwise distribution of galaxies, usually represented by a power spectrum. Today, the distribution of matter is far from Gaussian, with structures forming across a vast range of scales. To date, almost all spectroscopic analyses have used only the two-point function. This begs the question: can we extract more information using higher-point statistics?

In this seminar, I will present a pedagogical overview of the leading-order non-Gaussian statistics, and demonstrate how they can be used both to sharpen constraints on known physical parameters, and to provide stringent tests of new physics occurring in the early Universe. One of the major barriers to constraining cosmology from the higher-point functions is computational: measuring the statistics with conventional techniques is infeasible for current and future datasets. I will discuss new methods capable of reducing the computational cost by orders of magnitude, and show how this facilitates a number of exciting new tests of the cosmological model. Such techniques are already being applied to data from BOSS; the corresponding pipelines can be simply reapplied to DESI data, and will lead to sharper parameter constraints without additional observing time.

http://physics.lbl.gov/rpm/index.php/events/If you are looking to confirm if there is an event, due to room reservation, please go to RPM website for a list of all scheduled talks.
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Details

Date:: November 23, 2021
Time:: 12:00 pm - 1:00 pm
Website:: https://lbnl.zoom.us/j/98494136036?pwd=QnR3NjBWb0xQN0hZaTNjTjJGWWpaQT09

Venue

: Zoom Talk
: 50A-5132
Berkeley, ca 94720 + Google Map