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Find correlation function $\langle R^2(t_1) R^2(t_2)\rangle$ for 2d stochastic dynamics of polymer
The problem: Consider 2d stochastic dynamics \begin{equation} \partial_t R_\alpha = \sigma_{\alpha \beta} R_\beta \end{equation} \begin{equation} \langle \sigma_{\alpha \beta}(t_1) \sigma_{\mu \nu}(...
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