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, Grad Pheno Journal Club (3:30 PM - 4:45 PM)

Taewook Youn, Dark Acoustic Oscillation for the Cosmological Tensions (2:00 PM - 3:00 PM)

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Clifford Cheung, Generalized Symmetry in Dynamical Gravity (2:00 PM - 3:15 PM)

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Deog Ki Hong, Search for axion dark matter in the laboratory and in the cosmos (2:00 PM - 3:00 PM)

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Tony Zhou, Baryon Acoustic Oscillations (8:00 PM - 9:30 PM)

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John Eiler, Body Temperature of Dinosaurs (4:00 PM - 5:30 PM)

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John Eiler, The new science of life's origins and distribution in the universe (3:30 PM - 5:00 PM)

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Zare (3:30 PM - 5:30 PM)

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, Grad Pheno Journal Club (3:30 PM - 4:45 PM)

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David Awschalom, The Quantum Revolution: Emerging Technologies at the Atomic Scale (4:00 PM - 5:30 PM)

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Trakshu Sharma, Regge Bound on Higher-Point Scattering Amplitudes from Chaos (3:00 PM - 4:00 PM)

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, Grad Pheno Journal Club (3:30 PM - 4:45 PM)

Michael Toomey, Cosmic Tensions and Early Dark Energy (2:00 PM - 3:00 PM)

-- 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.

Conghuan Luo, Non-perturbative Explorations on Quantum Field Theories (2:00 PM - 3:50 PM)

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Kathleen Stebe, Defect Propelled Swimming of Nematic Colloids (4:00 PM - 5:30 PM)

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Milad Noorikuhani, Topics in large scale clustering statistics in cosmology (4:00 PM - 5:30 PM)

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