Event Category: 4D Seminar

4D Seminar series:
Monday at 2:30 on campus

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I will present a novel, simple possibility with broad implications for the predicted signals of non-thermal dark matter (DM) production scenarios: the Dark Sink. The addition of this dark-sector entropy sink may significantly increase the expected signals as I will demonstrate for well-known direct detection benchmarks with O(MeV) – O(TeV) DM.

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Abstract: Dark matter interactions with Standard Model particles can inject energy at early times, altering the standard evolution of the early universe. In particular, this energy injection can perturb the spectrum of the cosmic microwave background (CMB) away from that of a perfect blackbody, alter the CMB anisotropy spectrum, and affect processes by which the first stars form. For this … Read More

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Abstract: In the first half of my talk, I will present a way to parametrize new sources of CP violation in the Standard Model EFT (SMEFT) using flavor invariants. New sources of CP violation can feed into the QCD theta angle, jeopardizing solutions to the strong CP problem such as the axion. By means of an instanton calculation, I will … Read More

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Lattice QCD has enabled the non-perturbative calculation of many static quantities such as hadron masses and form factors. Quantum computers are expected to enable lattice calculations to directly probe the real time dynamics of quantum field theories. In this talk, I will review the motivation for quantum simulation and the formulations of lattice gauge theories that have been explored for quantum simulation. I … Read More

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Abstract:Thousands of person years have been invested in searches for New Physics (NP), the majority of them motivated by theoretical considerations. Yet, no evidence of beyond the Standard Model (BSM) physics has been found. This suggests that model-agnostic searches might be the key to explore NP, and help discover unexpected phenomena which can inspire future theoretical developments. A possible strategy … Read More

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Abstract: The top-down matching of specific scenarios for new physics onto the Standard Model Effective Field Theory (SMEFT) is well-understood and easy to automise. The inverse approach, however, the bottom-up matching of the SMEFT to UV models and in particular a systematic exploration of these discoverable UV models is more difficult. I will present a diagrammatic technique for the automated … Read More

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Abstract: An often overlooked problem in black hole physics is that the inner horizon of stationary black holes do not (generically) exist even in the equilibrium state (i.e. the Hartle-Hawking state), due to the divergence of quantum fields. Even though this behavior has been observed numerically in 2+1 and 3+1 dimensions for free fields, a universal and analytic understanding of it is lacking. … Read More

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In this talk, I’ll delve into recent work centred on muons, highlighting developments in two key areas: the Mu3e experiment’s search for light new particles and the study of muon behaviour in neutron stars. I’ll discuss how the Mu3e experiment is uniquely positioned to search for light new physics through resolving colinear electrons and positirons. For promptly decaying new resonances … Read More

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Abstract: I’ll discuss a new class of observables sensitive to CP violation in many-body meson decays utilizing the optimal transport metric known as the Earth Mover’s distance.   Join Zoom Meeting (if you are not able to attend in person) https://berkeley.zoom.us/j/99608635159?pwd=TnAyK2tZVmY0TWdrQzc2cHgzRVQvdz09 Meeting ID: 996 0863 5159 Passcode: 489725