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• W3126265485 abstract "We propose a method for constructing the time-dependent phase space distribution function (DF) of a collisionless system from an isolated kinematic snapshot. In general, the problem of mapping a single snapshot to a time-dependent function is intractable. Here we assume a finite series representation of the DF, constructed from the spectrum of the system's Koopman operator. This reduces the original problem to one of mapping a kinematic snapshot to a discrete spectrum rather than to a time-dependent function. We implement this mapping with a convolutional neural network (CNN). The method is demonstrated on two example models: the quantum simple harmonic oscillator, and a self-gravitating isothermal plane. The latter system exhibits phase space spiral structure similar to that observed in Gaia Data Release 2." @default.
• W3126265485 created "2021-02-15" @default.
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• W3126265485 date "2021-07-08" @default.
• W3126265485 modified "2023-10-16" @default.
• W3126265485 title "Inferring time-dependent distribution functions from kinematic snapshots" @default.
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• W3126265485 doi "https://doi.org/10.1093/mnras/stab1919" @default.
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