The Grand Design: How Large Scale Structure Illuminates Cosmology and Particle Physics

Title: The Grand Design: How Large-Scale Structure Illuminates Cosmology and Particle Physics– 8-09-2024
Guest Speaker: Abbe Whitford, PhD Student, University of Queensland, Australia.
Summary: In this webinar Abbe presents how large-scale structures in the universe, of the order of GPCs (giga-parsecs), can inform scientists on cosmology and the nature of particle physics. She begins by explaining that the study of large-scales structure is important to help determine the distribution of normal matter, dark matter, and the radiation of the early universe, after the big bang.
Right after the big bang, the radiation domination epoch began, where most of the energy was in the form of radiation. Over time the radiation decreased, and density of matter increased. As time continued, the dark energy domination epoch began, which is believed to be driving the expansion of the universe.
On the other hand, early in the universe it is believed that neutrinos stopped interacting with other particles and started flying freely. Although it was believed that these particles had no mass, now it seems that they might have a small mass. Based on the analysis presented, the mass of neutrinos might have a direct impact on the structure of the universe.
If you are interested in the study of cosmology and how it might have been influenced by neutrinos, this video will be for you. We hope you enjoy it!

Chapters

00:00- Introduction
01:28- Using the Large-scale Structure of the Universe
06:05- Why do we care about the Large-scale Structure of the Universe?
11:39- Part 1: Uncovering the nature of the Universe with the motions of galaxies.
19:07- Poll Question 1 (How fast do you think the peculiar motion can be?)
20:47- Dark Matter Field vs Normal Matter Field
26:02- Poll Question 2 (What fraction of matter do you think is just the dark matter?)
28:57- The bulk flow motions of galaxies
39:33- CosmicFlows 4 dataset
43:22- Part 2: Using the sound waves in the early Universe to understand neutrinos.
44:39- Poll Question 3 (How fast did sound waves move in the early Universe?)
46:43- Sound Waves as Bubbles or BAO’s data results
51:57- How is this related to neutrinos? And firstly, what are neutrinos?
59:36- Questions and Answers


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If you work with the postulates of Einstein's theory of relativity. And if we apply new technologies for this, using the experience of Michelson Morley on the airplane fixing speed 200, 300, 400 m/s., we will see how quantum gravity works. Such measurements are impossible on the satellite due to weightlessness.

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