Format results
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The dipole tension
Roya Mohayaee - Institut d'Astrophysique de Paris
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Prompt cusps of dark matter
Sten Delos - Carnegie Institution for Science
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Gravity under Scrutiny on Cosmic Scales
Agnès Ferté - Stanford University
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Kinetic theory of collisionless self-gravitating systems
Uddipan Banik - Princeton University
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Symmetries and anomalies at the IR fixed point of gravity
Kurt Hinterbichler - Case Western Reserve University
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"Primordial Black Holes and Gravitational Waves from Inflation "
Ogan Ozsoy - Universidad Autonoma de Madrid
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What does quantum gravity tell us about the puzzles of cosmology?"
Samir Mathur - Ohio State University
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Chaos and resonances in EMRI (extreme mass ratio inspiral) dynamics
Zhen Pan - Shanghai Jiao Tong University
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Spectrogram correlated stacking: A novel time-frequency domain analysis of the Stochastic Gravitational Wave Background
Niayesh Afshordi - University of Waterloo & Perimeter Institute
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Searching for the fundamental nature of dark matter in the cosmic large-scale structure
Keir Rogers - University College London
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The dipole tension
Roya Mohayaee - Institut d'Astrophysique de Paris
Standard model of cosmology is based on the cosmological principle. The cosmological principle states that the Universe is statistically homogeneous and isotropic on large scales. Is this hypothesis supported by the observations ? After a historical survey of the field, I shall use the high redshift… -
Prompt cusps of dark matter
Sten Delos - Carnegie Institution for Science
The onset of the formation of structure in the early universe was marked by the monolithic collapse of smooth peaks in the initial density field. This process creates prompt rho ~ r^-1.5 density cusps of dark matter, which persist largely unaltered through the subsequent growth of dark matter halos… -
Examining challenges to LCDM model near and far: from nearby dwarf galaxies to UV bright galaxies at z>5
Andrey Kravtsov - University of Chicago
I will present a galaxy formation model within the Lambda Cold Dark Matter (LCDM) framework that is calibrated on the results of galaxy formation simulations and some of the empirical properties of nearby dwarf galaxies. I will then use the model to interpret a number of ostensible challenges to the… -
Gravity under Scrutiny on Cosmic Scales
Agnès Ferté - Stanford University
While General Relativity has withstood tests on solar system scales, progress in observational cosmology now enables tests on the largest scales. I will present results from our tests of gravity using Dark Energy Survey Year 3 weak lensing and clustering data in addition to a variety of… -
Linear waves in spacetimes - Sharmila Gunasekara, The Fields Institute for Research in Mathematical Sciences
I will introduce the stability problem for spacetimes from the initial value formulation perspective in general relativity. After introducing some notions on how to quantitatively characterize (in)stability, I will present a result for a class of spacetimes called gravitational solitons which… -
Kinetic theory of collisionless self-gravitating systems
Uddipan Banik - Princeton University
Abstract and Zoom Link: TBD -
Symmetries and anomalies at the IR fixed point of gravity
Kurt Hinterbichler - Case Western Reserve University
I will discuss symmetries that arise at the infrared fixed point of the RG flow of Einstein gravity, including conformal vs. scale invariance in various dimensions, as well as 1-form generalized global symmetries and new anomalies that arise among them. Zoom link: https://pitp.zoom.us/j/93217255461… -
"Primordial Black Holes and Gravitational Waves from Inflation "
Ogan Ozsoy - Universidad Autonoma de Madrid
Primordial black holes (PBHs), if they exist, may shed light on long-standing questions on the nature of dark matter and mechanism driving cosmic inflation. If we associate their origin to the presence of enhanced primordial scalar fluctuations generated during inflation, the underlying dynamics… -
What does quantum gravity tell us about the puzzles of cosmology?"
Samir Mathur - Ohio State University
Cosmology presents some puzzling aspects: the cosmological constant, the nature of the big bang, the source of inflation, and perhaps the tension in Hubble constant values. One normally uses standard effective field theory to study cosmology. But we know that such an approach fails in black holes… -
Chaos and resonances in EMRI (extreme mass ratio inspiral) dynamics
Zhen Pan - Shanghai Jiao Tong University
EMRIs are one of the primary targets of spaceborne gravitational wave (GW) detectors and will be ideal GW sources for testing fundamental laws of gravity. In a generic non-Kerr spacetime, the EMRI system is non-integrable due to the lack of the Carter constant. As a result, chaos along with… -
Spectrogram correlated stacking: A novel time-frequency domain analysis of the Stochastic Gravitational Wave Background
Niayesh Afshordi - University of Waterloo & Perimeter Institute
The astrophysical stochastic gravitational wave background (SGWB) originates from numerous faint sub-threshold gravitational wave (GW) signals arising from the coalescing binary compact objects. This background is expected to be discovered from the current (or next-generation) network of GW… -
Searching for the fundamental nature of dark matter in the cosmic large-scale structure
Keir Rogers - University College London
The fundamental nature of dark matter (DM) so far eludes direct detection experiments, but it has left its imprint in the large-scale structure (LSS) of the Universe. I will present a search using cosmic microwave background (CMB) and galaxy surveys for ultra-light DM particle candidates called…