The construction of the $\Phi^4$ model in 3 dimensions in the 1970s has
been one of the major achievements of mathematical physics. In the 1980s
Parisi and Wu suggested an alternative way of constructing Euclidean
quantum field theories by viewing the correlation functions as moments
of invariant measures of certain stochastic PDEs. However, the highly
singular nature of these equations prevented their application in
rigorous constructions until the breakthroughs in the area of singular
stochastic PDEs in the past decade. After explaining the basic idea
behind stochastic quantization proposed by Parisi and Wu I will show how
to apply this technique to construct the measure of a certain quantum
field theory model generalizing the $\Phi^4_3$ model called the
fractional $\Phi^4$ model. The measure of this model is obtained as a
perturbation of the Gaussian measure with covariance given by the
inverse of a fractional Laplacian. Since the Gaussian measure is
supported in the space of Schwartz distributions and the quartic
interaction potential of the model involves pointwise products, to
construct the measure it is necessary to solve the so-called
renormalization problem. The talk is based on joint work with M.
Gubinelli and P. Rinaldi.