- Title题目 Gravitational Decoherence with Applications to Dark Matter Phenomenology
- Speaker报告人 Itamar J. Allali ( Tufts University)
- Date日期 2021年10月19日 10:00
- Venue地点 Join Zoom Meeting https://us02web.zoom.us/j/81543223556?pwd=R2k0clVaOXo4NXowcXhhY0Nvamx5Zz09 Meeting ID: 815 4322 3556 Passcode: 333501
Nontrivial quantum arrangements of matter, such as Schrodinger cat-like states, are sensitive to decoherence from their environment. However, matter that interacts only gravitationally is weakly coupled to its environment, and thus may exhibit slower rates of decoherence. Since dark matter (DM) may only interact via gravity, we explore the decoherence rate of a dark-matter-Schrodinger-cat-state (DMSCS). In the nonrelativistic approximation of gravity, we find that a superposition of distinct DM density profiles can undergo decoherence from the scattering of nearby standard model (SM) particles on observable timescales. In addition, when considering light bosonic DM like an axion, one can conceive of a superposition of the phase of oscillation of the scalar (axion) field, requiring a truly relativistic formalism of gravitational scattering. We derive such a formalism and find that for typical DM populations in the Milky Way, a DMSCS of the axion phase can maintain quantum coherence for exponentially long times, while exotic configurations including DM near a black hole and dense boson stars can experience rapid decoherence. This can have potential observable consequences for direct detection experiments that are sensitive to the axion's phase, such as haloscopes which rely on resonant cavities to detect axions. This talk will be based on the work in Refs. 2005.12287, 2012.12903, and 2103.15892 (Phys.Rev.Lett. 127 (2021) 3, 031301).