【直播】【中科院理论物理所】Itamar J. Allali of Tufts University、理论物理所张潘
本次报告由中国科学院理论物理研究所主办，分别于2021年10月19日10:00、14:00开始，授权蔻享学术进行网络直播。
直播二维码
Gravitational Decoherence with Applications to Dark Matter Phenomenology
报告人
Itamar J. Allali (Tufts University)
时间
2021年10月19日 10:00
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).
直播二维码
诺贝尔奖解读---Parisi和副本对称破缺
报告人
张潘 (中国科学院理论物理研究所)
时间
2021年10月19日 14:00
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