Abstract
We prove the existence of global solutions to singular SPDEs on \({\mathbb{R}^{\rm d}}\) with cubic nonlinearities and additive white noise perturbation, both in the elliptic setting in dimensions d = 4, 5 and in the parabolic setting for d = 2, 3. We prove uniqueness and coming down from infinity for the parabolic equations. A motivation for considering these equations is the construction of scalar interacting Euclidean quantum field theories. The parabolic equations are related to the \({\Phi^{4}_d}\) Euclidean quantum field theory via Parisi–Wu stochastic quantization, while the elliptic equations are linked to the \({\Phi^{4}_{d-2}}\) Euclidean quantum field theory via the Parisi–Sourlas dimensional reduction mechanism.
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MG is partially supported by the German Research Foundation (DFG) via CRC 1060.
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Gubinelli, M., Hofmanová, M. Global Solutions to Elliptic and Parabolic \({\Phi^4}\) Models in Euclidean Space. Commun. Math. Phys. 368, 1201–1266 (2019). https://doi.org/10.1007/s00220-019-03398-4
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DOI: https://doi.org/10.1007/s00220-019-03398-4