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- W3175474310 abstract "Cosmological boundary conditions for particles and fields are often discussed as a Cauchy problem, in which configurations and conjugate momenta are specified on an “initial” time slice. But this is not the only way to specify boundary conditions, and indeed in action-principle formulations we often specify configurations at two times and consider trajectories joining them. Here, we consider a classical system of particles interacting with short range two body interactions, with boundary conditions on the particles’ positions for an initial and a final time. For a large number of particles that are randomly arranged into a dilute gas, we find that a typical system trajectory will spontaneously collapse into a small region of space, close to the maximum density that is obtainable, before expanding out again. If generalizeable, this has important implications for the cosmological arrow of time, potentially allowing a scenario in which both boundary conditions are generic and also a low-entropy state “initial” state of the universe naturally occurs." @default.
- W3175474310 created "2021-07-05" @default.
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- W3175474310 date "2022-07-19" @default.
- W3175474310 modified "2023-09-25" @default.
- W3175474310 title "State-to-State Cosmology: A New View on the Cosmological Arrow of Time and the Past Hypothesis" @default.
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- W3175474310 doi "https://doi.org/10.1007/s10701-022-00597-3" @default.
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