Date | Event Type | Speaker | |
04/02/2024 | Astro Seminar | Thales Gutcke [ + ] | |
04/02/2024 | Grad Pheno Journal Club | [ + ] | |
04/03/2024 | ArXiv Discussion | HEP/Pheno Journal Club [ + ] | |
04/03/2024 | HEP Seminar | Taewook Youn [ + ] | |
04/04/2024 | Physics Dept Colloquium | Itai Cohen [ + ] | |
04/05/2024 | HEP Discussion Sessions | Zare [ + ] | |
04/09/2024 | Astro Seminar | Matthew McQuinn [ + ] | |
04/10/2024 | Special Seminar | Or Graur [ + ] | |
04/10/2024 | HEP Seminar | Clifford Cheung [ + ] | |
04/11/2024 | Physics Dept Colloquium | Karen Kasza [ + ] | |
04/12/2024 | HEP Discussion Sessions | Zare [ + ] | |
04/16/2024 | Grad Pheno Journal Club | [ + ] | |
04/17/2024 | ArXiv Discussion | HEP/Pheno Journal Club [ + ] | |
04/17/2024 | HEP Seminar | Deog Ki Hong [ + ] | |
04/17/2024 | Cosmic Happy Hour | Tony Zhou [ + ] | |
04/18/2024 | Informal HEP Talk | Thomas Faulkner [ + ] | |
04/18/2024 | Physics Dept Colloquium | John Eiler [ + ] | |
04/19/2024 | Informal HEP Talk | Edward Mazenc [ + ] | |
04/19/2024 | Special Seminar | John Eiler [ + ] | |
04/19/2024 | HEP Discussion Sessions | Zare [ + ] | |
04/22/2024 | CCPP Brown Bag | David Hogg [ + ] | |
04/23/2024 | Astro Seminar | Nikhil Padmanabhan [ + ] | |
04/23/2024 | Grad Pheno Journal Club | [ + ] | |
04/24/2024 | HEP Seminar | T Daniel Brennan [ + ] | |
04/25/2024 | Oral Defense | Nicholas Faucher [ + ] | |
04/25/2024 | Physics Dept Colloquium | David Awschalom [ + ] | |
04/26/2024 | HEP Discussion Sessions | Zare [ + ] | |
04/29/2024 | CCPP Brown Bag | Giovanni Verza [ + ] | |
04/29/2024 | Informal HEP Talk | Trakshu Sharma [ + ] | |
04/30/2024 | Astro Seminar | Anna Suliga [ + ] | |
04/30/2024 | Grad Pheno Journal Club | [ + ] | |
05/01/2024 | ArXiv Discussion | HEP/Pheno Journal Club [ + ] | |
05/01/2024 | HEP Seminar | Michael Toomey [ -- ] | |
Title: Cosmic Tensions and Early Dark Energy Abstract: Cosmological datasets consistently exhibit growing tension with the Λ Cold Dark Matter (ΛCDM) model of cosmology. The most striking discrepancy is between direct measurements of today's expansion rate (H0) using Cepheid-calibrated supernovae and the expansion rate inferred from ΛCDM fits to early-Universe data sets, namely the cosmic microwave background (CMB). This discrepancy now sits at a 5σ tension. More recently, measurements of galaxy clustering, as parameterized by the amplitude of dark matter density fluctuations (σ8), suggest further tension within the concordance model. One leading proposal to resolve the H0 tension is Early Dark Energy (EDE), which posits a slow-rolling scalar field active shortly before CMB formation. This field acts as a new, brief source of energy injection, modifying the size of the sound horizon—a critical standard ruler for constraining H0. In the first half of this talk, I will discuss the most recent constraints from combined analyses of CMB and large-scale structure datasets, which show that the original axion-like EDE model is strongly disfavored. I will also demonstrate that these constraints are not influenced by prior volume effects, which have been argued to artificially disfavor the model in Bayesian MCMC analyses of EDE. In the final part of the talk, I will present the first constraints on early dark energy using theory-informed priors in an analysis with CMB and large-scale structure datasets. Leveraging normalizing flows, a type of machine learning architecture, this represents the most stringent constraints on the model to date. Along the way, I will also comment on some general insights gained from the detailed analysis of the EDE scenario and how this should inspire model builders to construct future, well-motivated extensions of ΛCDM. (2:00 PM - 3:00 PM, 726 Broadway, 940, CCPP Seminar) | |||
05/02/2024 | Oral Defense | Xucheng Gan [ + ] | |
05/02/2024 | Oral Defense | Conghuan Luo [ + ] | |
05/02/2024 | Physics Dept Colloquium | Kathleen Stebe [ + ] | |
05/03/2024 | HEP Discussion Sessions | Zare [ + ] | |
05/03/2024 | Oral Defense | Milad Noorikuhani [ + ] | |
05/06/2024 | CCPP Brown Bag | Patrick Breysse [ + ] | |
05/07/2024 | Grad Pheno Journal Club | [ + ] | |
05/10/2024 | HEP Discussion Sessions | Zare [ + ] |