Abstract
We derive the first two terms in an ɛ-expansion for the invariant measure of a class of semilinear parabolic SPDEs near a change of stability, when the noise strength and the linear instability are of comparable order ɛ2. This result gives insight into the stochastic bifurcation and allows to rigorously approximate correlation functions. The error between the approximate and the true invariant measure is bounded in both the Wasserstein and the total variation distance.
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Communicated by A. Kupiainen
Acknowledgements The work of D.B. was supported by DFG-Forschungsstipendium BL535/5-1. The work of M.H. was supported by the Fonds National Suisse. Both authors would like to thank the MRC at the University of Warwick and especially David Elworthy for their warm hospitality.
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Blömker, D., Hairer, M. Multiscale Expansion of Invariant Measures for SPDEs. Commun. Math. Phys. 251, 515–555 (2004). https://doi.org/10.1007/s00220-004-1130-7
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DOI: https://doi.org/10.1007/s00220-004-1130-7