Event Category: Particle Seminar

Particle Seminar:
Wednesdays 2:00pm at LBNL

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Join Zoom Meeting: https://lbnl.zoom.us/j/94928022788?pwd=emVQWG1mTnhSbHVqekVuenk0VEVQZz09 Title: Waveform estimation and noise spectroscopy at the fundamental quantum limit Abstract: Waveform estimation is the task of measuring a whole function rather than just a few unknown parameters. This is a canonical problem at the frontier of physics (from gravitational-wave observatories to ultralight dark matter haloscopes) and emerging technologies (from quantum imaging to profiling quantum … Read More

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Join Zoom Meeting: https://lbnl.zoom.us/j/94928022788?pwd=emVQWG1mTnhSbHVqekVuenk0VEVQZz09 Title: The Waning of the WIMP: From Strong Freeze-In to the Sub-GeV Frontier Abstract: Weakly interacting massive particles (WIMPs) have long been among the most compelling dark matter candidates, motivated in part by the so-called WIMP miracle. However, despite extensive searches through direct, indirect, and collider probes, no conclusive signal has yet been established. In this … Read More

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Join Zoom Meeting: https://lbnl.zoom.us/j/94928022788?pwd=emVQWG1mTnhSbHVqekVuenk0VEVQZz09 Title: Enhancements of Small-Scale Structure Abstract: While the concordance LCDM model of cosmology well-describes the observed large-scale structure of the Universe, models of new physics predict enhancements of small-scale power, for which observations are limited and theoretical predictions carry more uncertainty. In this talk, I will discuss how various cosmological observables are or can be used … Read More

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Join Zoom Meeting: https://lbnl.zoom.us/j/94928022788?pwd=emVQWG1mTnhSbHVqekVuenk0VEVQZz09 Title: Dark matter substructure as a probe of dark matter microphysics Abstract: The nature of dark matter on the scales of galaxies and clusters remains uncertain. Several alternatives to the cold dark matter paradigm remain theoretically motivated such as Ultralight dark matter, warm dark matter, and self-interacting dark matter. In this talk I first review how … Read More

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Join Zoom Meeting: https://lbnl.zoom.us/j/94928022788?pwd=emVQWG1mTnhSbHVqekVuenk0VEVQZz09 Title: Probing Dark Matter in the Milky Way with Physics-Informed Neural Networks Abstract: Physics-informed neural networks (PINNs) offer a mesh-free, fully differentiable approach to the partial differential equations that arise throughout astrophysics. We present two applications of PINNs to Milky Way astronomy that probe the presence and nature of dark matter: ClearPotential and PINNCR. ClearPotential solves … Read More

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Note: This seminar will be held at UC Berkeley, 325 Physics South Title: Supercooling and Confinement in the 1/D expansionAbstract: Confinement phase transitions in the early universe are important targets for future gravitational wave observatories. The signals rely on a strong first-order phase transition with significant supercooling.  I will present evidence from various examples that suggest that generic confinement transitions are … Read More

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Join Zoom Meeting: https://lbnl.zoom.us/j/94928022788?pwd=emVQWG1mTnhSbHVqekVuenk0VEVQZz09 Title: Fermionic (non)reheating in quartic potentials Abstract: When the inflaton decays into bosons, parametric resonance and Bose enhancement break the perturbative Boltzmann approach, and the study of preheating requires non-perturbative methods. For this reason, decays into fermions are often invoked: Pauli blocking would prevent the growth of occupation numbers, and the decay is expected to be … Read More