A5006761061- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Optical properties and cooling technologies in crystalline materials
- Semiconductor Quantum Structures and Devices
- Scientific Research and Discoveries
- Electrostatics and Colloid Interactions
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
Perimeter Institute
2020-2025
Kavli Institute for Theoretical Sciences
2025
University of Waterloo
2024
Axion dark matter (DM) constitutes an oscillating background that violates parity and time-reversal symmtries. Inside piezoelectric crystals, where is broken spontaneously, this axion can result in a stress. We call new phenomenon “the piezoaxionic effect.” When the frequency of DM matches natural bulk acoustic normal mode crystal, effect resonantly enhanced be read out electrically via effect. explore all couplings give rise to effect—the most promising one defining coupling QCD axion,...
A bstract We show that axion dark matter in the range meV ≲ m a 100 can incoherently excite phonons crystal targets with unpolarised nuclear spins. This occur through its coupling to spins and/or induced time-dependent electric dipole moment nuclei. Due random orientation of spins, translation symmetry is broken phonon effective theory, allowing absorption create unrestricted momentum. The rate therefore proportional density states, which generically has support across wide energies, for...
The QCD axion is one of the best motivated dark matter candidates. misalignment mechanism well known to produce an abundance consistent with for decay constant order $10^{12}$ GeV. For a smaller constant, axion, Peccei-Quinn symmetry broken during inflation, makes up only fraction unless field starts oscillating very close top its potential, in scenario called "large-misalignment". In this scenario, small partially comprised dense structures. We present simple dynamical model realising...
Axion dark matter (DM) constitutes an oscillating background that violates parity and time-reversal symmtries. Inside piezoelectric crystals, where is broken spontaneously, this axion can result in a stress. We call new phenomenon "the piezoaxionic effect". When the frequency of DM matches natural bulk acoustic normal mode crystal, effect resonantly enhanced be read out electrically via effect. explore all couplings give rise to -- most promising one defining coupling QCD axion, through...
We show that piezoelectric materials can be used to source virtual QCD axions, generating a new axion-mediated force. Spontaneous parity violation within the crystal combined with time-reversal from aligned spins provide necessary symmetry breaking produce an effective in-medium scalar coupling of axion nucleons up 7 orders magnitude larger than in vacuum. propose detection scheme based on nuclear spin precession caused by axion's pseudoscalar spins. This signal is resonantly enhanced when...
We show that axion dark matter in the range meV $\lesssim m_a\lesssim$ 100 can incoherently excite phonons crystal targets with unpolarised nuclear spins. This occur through its coupling to spins and/or induced time-dependent electric dipole moment nuclei. Due random orientation of spins, translation symmetry is broken phonon effective theory, allowing absorption create unrestricted momentum. The rate therefore proportional density states, which generically has support across a wide...