Conveners
Session 7: Wednesday
- Hayley Macpherson (University of Chicago)
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Leonardo Giani05/02/2025, 08:30
Does the Universe look the same everywhere? Are we living in a special place?
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These questions have intrigued laypeople and philosophers alike for centuries, but for the first time, astronomers are in the position of addressing them quantitatively. Existing state-of-the-art maps of the Universe around us, combined with an upcoming wealth of observational data, compel us to seek a deeper... -
Francesco Sorrenti (University of Geneva)05/02/2025, 09:00
Peculiar velocities surveys are going to play a key role in testing our knowledge about the nearby universe and our cosmological assumptions. In this talk, I will review what peculiar velocities are and some recent fundings and analysis that I have been developed concerning these novel observables. In particular, I will focus on the information we can extrapolate about peculiar velocities from...
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Prof. Tamara Davis (The University of Queensland)05/02/2025, 09:30
In this talk I will look at some theoretical details of peculiar velocities. We’ll explore different ways that peculiar velocities can be measured and corrected for. We’ll discuss what it means to say “space is expanding” and answer the question of whether it is possible to have a galaxy “at rest” with respect to us if it is beyond the Hubble sphere (which is similar to asking whether a...
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Dr Mark Neyrinck (Blue Marble Space Institute of Science; University of Denver)05/02/2025, 09:50
There is an analogy between terrestrial and cosmic watersheds, and river networks. A terrestrial (usual) watershed is a patch of land where water all flows into the same river. Cosmic watersheds gather matter into the cosmic web of walls and filaments, all flowing inward toward galaxies. How good is that analogy? One quantitative way to investigate this question is through a "cosmic...
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David Wiltshire05/02/2025, 10:10
The timescape model revisits the foundations of general relativity — the issues of quasilocal energy and angular momentum in a universe with large complex structures. Quantitative predictions had to wait til the 2020s for observations to reach a precision to distinguish the timescape model from the 100-year old Friedmann-Lemaître models, on which standard cosmology is based. With a huge...
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