Events at Director’s Conference Room (50A-5132)

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Nelson-Barr ultralight dark matter Light scalar fields are well motivated dark matter candidates, as they commonly arise as pseudo-Goldstone bosons and their abundance is set by the misalignment mechanism. The best known example is perhaps the celebrated QCD axion, further motivated as a solution to the strong CP-problem. I will discuss how in the orthogonal Nelson-Bar solution to the strong … Read More

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https://lbnl.zoom.us/j/94928022788?pwd=emVQWG1mTnhSbHVqekVuenk0VEVQZz09 Title: Constraining PV and CPV nucleon-nucleon long range interactions in diatomic eEDM searches and chiral molecules Abstract: Searches for CP violating effects in diatomic molecules are typically interpreted as a probe of the electron’s electric dipole moment (eEDM), a new electron-nucleon interaction, and a new electron-electron interaction. However, in the case of a non-vanishing nuclear spin, a new CP … Read More

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Title: Towards a Field Redefinition Invariant Description of Effective Field Theories Abstract: Physical observables are invariant under field redefinitions, motivating a geometric formulation of Effective Field Theories. I will first review the scalar field-space geometry, where scalar fields are treated as coordinates on a Riemannian manifold, and show how this perspective simplifies calculations involving higher-dimensional operators, particularly in the context … Read More

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Title: Probing fundamental physics with compact objects Abstract: In parallel with the extensively explored energy frontier, which seeks to push particle accelerators to higher energies, a complementary paradigm for probing fundamental physics has gained increasing prominence over the past decades. The so-called intensity frontier aims to uncover physics beyond the Standard Model by increasing the scattering rate of particles involved … Read More

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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: 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