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arXiv 2004.01513math.PRmath-phmath.MP
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基于Girsanov定理的$Φ^4_3$测度

The $Φ^4_3$ measure via Girsanov's theorem

Nikolay Barashkov, Massimiliano Gubinelli

摘要:

我们构造了三维周期盒上的$Φ^4_3$测度作为高斯自由场随机位移的绝对连续扰动。通过Girsanov定理构造移位测度,并且相关的过滤是由尺度参数生成的过滤。作为一个副产品,我们给一个自包含的证明,$Φ^4_3$措施是奇异的wrt。高斯自由场

英文摘要:

We construct the $Φ^4_3$ measure on a periodic three dimensional box as an absolutely continuous perturbation of a random shift of the Gaussian free field. The shifted measure is constructed via Girsanov's theorem and the relevant filtration is the one generated by a scale parameter. As a byproduct we give a self-contained proof that the $Φ^4_3$ measure is singular wrt. the Gaussian free field.

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