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Beyond the van Hove time scale

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SRQW02 - Quantum field theory, renormalisation and stochastic partial differential equations

Given an arbitrarily large, but fixed, time t >0, we derive approximations for the time evolution of the spin-boson model in terms of the propagator generated by a free effective Hamiltonian. Our construction rests on the renormalization group induced by the isospectral Feshbach-Schur ap. This is joint work with Jacob Schach Möller and Matthias Westrich.

This talk is part of the Isaac Newton Institute Seminar Series series.

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