Abstract: Axion dark matter which couples to fermions can act as an effective magnetic field, the “axion wind”, inducing spin precession in condensed matter systems. I will describe a new proposal for axion wind detection using an unusual phase of superfluid helium-3, the homogeneous precession domain (HPD). In the HPD, spins precess coherently over a macroscopic volume even in the … Read More

Heavy axions can arise in the context of Grand Unified theories where a confining dark gauge group unifies with the Standard Model (SM) gauge group. Depending on the strength of the axion coupling to the SM, heavy axion lifetimes can vary drastically, requiring very different observational probes. I will discuss two such probes. First, I will show heavy axions with MeV … Read More

Abstract:  “In the non-relativistic limit, scattering of two particles by boson exchange can be described using a static potential, i.e, that of a force between them. The exchange of two fermions can also lead to a force, as if the two fermions behave like an effective boson. These forces are called “quantum forces”, and the range of these forces is … Read More

Abstract: In work to appear with Ballin-Creutzig-Dimofte, we constructed vertex operator algebras associated to A and B twists of 3d N=4 abelian gauge theories. These are boundary VOAs supported on holomorphic boundary conditions of Costello-Gaiotto. For the B twist, the vertex algebra V_B is a simple current extension of an affine Lie superalgebra, and using the work of Creutzig-Kanade-McRae, we … Read More