Theory overview of DM-induced phonon excitations Tongyan Lin UCSD � Fermilab, June 5, 2019 For extended discussion of theory framework, see: TL, 1904.07915 (lecture notes); Gri ffi n, Knapen, TL, Zurek 1807.10291 (crystals); Knapen, TL, Zurek 1611.06228 (superfluid He); additional refs cited throughout this talk
Outline Why phonons? Calculating DM-phonon excitations Lessons and future work 2
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Why phonons? 1. Two most common elementary excitations in solid state materials: electrons and phonons. Phonons must be considered for low mass dark matter DM-phonon scattering DM-nucleon scattering χ χ χ χ φ ρ Phonon n n quasiparticle 5
Why phonons? 2. Kinematics of phonon excitation is suited to ~10 keV-MeV dark matter. Phonon energies ~1-100 meV y g r e Typical recoil energy n e M keV D l Nuclear recoils a t o T eV Phonons meV keV MeV GeV TeV Dark matter mass 6
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