Observation of a Space-Time Crystal in a Superfluid Quantum Gas.
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DOI: 10.1103/physrevlett.121.185301
Abstract: Time crystals are a phase of matter, for which the discrete time symmetry of the driving Hamiltonian is spontaneously broken. The breaking of discrete time symmetry has been observed in several experiments in driven spin… read more here.
Keywords: crystal superfluid; space time; time; time crystal ... See more keywords
Aerostat-Based Observation of Space Objects in the Stratosphere
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DOI: 10.3390/app14125175
Abstract: For the requirements of the multi-means observation and emergency monitoring of space objects, including space debris and near-earth asteroids, this paper analyzes the astronomical observation conditions in the stratosphere, which is the region of the… read more here.
Keywords: space; aerostat based; based observation; observation space ... See more keywords