Search for Light Dark Matter with Quadratic Interactions in Standard Model Fields

Explore a physics seminar presentation examining innovative search methods for light dark matter with quadratic interactions, delivered by Da Liu from the University of Pittsburgh. Learn about the theoretical framework where light dark matter interacts quadratically with Standard Model fields, resulting in effective interactions between dark matter and nucleon fields below QCD confinement scale. Understand how these interactions create potential barriers affecting dark matter wind around ordinary matter, potentially causing bounce-back effects and inducing measurable pressure forces. Delve into various experimental constraints including Supernova cooling, Big Bang Nucleosynthesis, and gravitational inverse square law tests, while discovering potential detection methods through space-based weak equivalence principle experiments. Cover key topics including field-like vs particle-like dark matter models, acceleration effects, geometric limits, shielding effects, and practical experimental approaches using torsion balances, microscopes, and Galileo-type tests.