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

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

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