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Sep 24, 2017 at 15:12 history edited Everett You CC BY-SA 3.0
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Dec 7, 2015 at 20:33 comment added Everett You Yes, this requirement is general for any ETH state, as long as the region B is small compared to the whole system. You may even think $\rho_B=Z^{-1}e^{-\beta H_B}$ as an equivalent statement of ETH.
Dec 7, 2015 at 2:20 comment added Wayne Zheng I see...Quantum Chaotic system does not need time to thermalize. But I wonder how general is this requirement you provided here? Does it imply that if ETH is valid, then this requirement is fulfilled?
Oct 31, 2015 at 5:01 history answered Everett You CC BY-SA 3.0