Format results
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What is S_8(z_low) actually?
Noah Sailer - University of California, Berkeley
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Where are the supermassive black holes measured by PTAs?
Gabriela Sato-Polito - Institute for Advanced Study (IAS) - School of Natural Sciences (SNS)
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Graviton non-Gaussianity with non-Bunch-Davies initial conditions
Maria Mylova - University of Tokyo
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Think Emergent -- what if we abandon the fundamentality of (quantum) gravity?
Angela Chen - University of Tokyo
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What's Your Story? Merger tracers in present-day galaxies
Lucas Valenzuela - Ludwig-Maximilians-Universität München (LMU)
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Joint modeling of astrophysical systematics for cosmological surveys
Niko Sarcevic - Newcastle University
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The Tacoma Narrows bridge collapse, 1940
Bill Unruh - University of British Columbia
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Turning Back Time on Space
Farnik Nikakhtar - Yale University
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Searching for New Physics in the Late Universe With Millions of Galaxies in Millions of Dimensions - VIRTUAL ONLY
Minh Nguyen - University of Michigan–Ann Arbor
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Fundamental Physics from Galaxy Surveys
Mikhail Ivanov - Massachusetts Institute of Technology (MIT)
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What is S_8(z_low) actually?
Noah Sailer - University of California, Berkeley
Claims of a low clustering amplitude (S_8) at low redshifts from weak galaxy lensing measurements trace back nearly a decade, however, recent work suggests these results may be driven by large baryonic feedback or mischaracterization of linear alignments. I will present a complimentary approach to… -
Where are the supermassive black holes measured by PTAs?
Gabriela Sato-Polito - Institute for Advanced Study (IAS) - School of Natural Sciences (SNS)
Pulsar timing arrays (PTAs) consist of a set of regularly monitored millisecond pulsars with extremely stable rotational periods. The arrival time of pulses can be altered by the passage of gravitational waves (GWs) between them and the Earth, thus serving as a galaxy-wide GW detector. Evidence for… -
Cosmological Coupling in the Era of the Dark Energy Spectroscopic Instrument
Kevin Croker
Recent advances in General Relativity point toward unanticipated, and dynamic, relations between ultracompact objects and the universe they inhabit. The possibility for strongly gravitating systems, like astrophysical black holes (BHs) and their embedding cosmology, to directly interact has been… -
Squeezing primordial non-Gaussianity out of the matter bispectrum (and trispectrum) with consistency relations
Sam Goldstein - Columbia University
In this seminar, I will discuss recent progress towards developing robust methods to constrain PNG in the non-linear regime based on the LSS consistency relations — non-perturbative statements about the structure of LSS correlation functions derived from symmetries of the LSS equations of motion… -
Graviton non-Gaussianity with non-Bunch-Davies initial conditions
Maria Mylova - University of Tokyo
I will discuss recent progress on the initial conditions for inflation and how this can potentially enhance gravitational wave non-Gaussianity (NG). In particular, there is a significant additional NG contribution in the flattened configuration, offering a straightforward way to boost parity… -
Think Emergent -- what if we abandon the fundamentality of (quantum) gravity?
Angela Chen - University of Tokyo
In this talk, I will present a published and an ongoing work in the direction of emergent gravity. The first is what I dubbed as the generalized Unruh effect, a mapping from arbitrary states in the Fock space of positive Minkowski (Kruskal) modes to Rindler (Schwarzschild) modes obtained by… -
What's Your Story? Merger tracers in present-day galaxies
Lucas Valenzuela - Ludwig-Maximilians-Universität München (LMU)
Present-day galaxies still contain a multitude of clues about their formation histories. But which properties should we best look at and what do they actually reveal about the past? Using cosmological simulations, I will show what insights about a galaxy's formation and merger history can be gained… -
Joint modeling of astrophysical systematics for cosmological surveys
Niko Sarcevic - Newcastle University
In this talk, I will present a novel framework for modeling the weak lensing source galaxy redshift distribution and galaxy intrinsic alignment via a shared luminosity function. In the context of LSST Year 1 and Year 10 cosmic shear analysis, I demonstrate the significant impact of the luminosity… -
The Tacoma Narrows bridge collapse, 1940
Bill Unruh - University of British Columbia
4 months after it opened, the Tacoma Narrows bridge, one of the world's longest suspension bridges at the time, collapsed spectacularly in the first storm that hit it. Though it was built to exceed all of the standrds at the time, something clearly went wrong. The failure was filmed from almost the… -
Turning Back Time on Space
Farnik Nikakhtar - Yale University
One big question in the physics of large-scale structures is how we can trace back the evolution of cosmic structures and reconstruct the initial density field. The universe we observe today is dotted with galaxy clusters separated by vast voids, in sharp contrast to its initial state, which was… -
Searching for New Physics in the Late Universe With Millions of Galaxies in Millions of Dimensions - VIRTUAL ONLY
Minh Nguyen - University of Michigan–Ann Arbor
The growth of cosmic structures provides a bridge between observations and theories. In the first part of this talk, I will review the sigma8 tension between early- and late-time measurements of cosmic structure growth, and its physical implications. Are we seeing a chink in the standard… -
Fundamental Physics from Galaxy Surveys
Mikhail Ivanov - Massachusetts Institute of Technology (MIT)
Elucidating the nature of dark matter, dark energy, and dynamics of the early universe stand as major challenges of modern cosmology and particle physics. I will present a new program of addressing these challenges with galaxy surveys. This program builds on theoretical particle physics tools and…