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The interaction between the system and environment is really just any plain old interaction you like. For instance, if you can have electron-EM coupling, or spin-spin interaction or whatever. What is key to decoherence is that once you write the Hamiltonian for the total system+environment you trace over the environment degrees of freedom - this corresponds ...


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I have found some articles that might be of interest to you: An analytical semiclassical treatment A simulation of the spin decoherence due to a randomly fluctuating spin bath A comprehensive review What I've managed to understand, from briefly reading these papers, is that the gaussian decoherence is a result of the broadening of the energy of the spins ...


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The webpage you were looking at is run by H. D. Zeh. So if you want to find out what he's talking about the best way to find out is to look up some of his papers, such as: http://arxiv.org/abs/1012.4708. He describes decoherence in quantum gravity in Section 5 of the paper. The basic answer is as follows. The Wheeler-DeWitt equation is time-independent in ...


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To "see another World" would require doing a measurement that involves (partially) reversing the effect that led to the split. In practice this is impossible to realize because the observer is a macroscopic object itself and it will decohere very fast. Decoherence means that the system becomes correlated with the environment and that poses a big problem ...



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