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• W3136240625 abstract "We introduce a decoupling method on the Wiener space to define a wide class of anisotropic Besov spaces. The decoupling method is based on a general distributional approach and not restricted to the Wiener space. The class of Besov spaces we introduce contains the traditional isotropic Besov spaces obtained by the real interpolation method, but also new spaces that are designed to investigate backwards stochastic differential equations (BSDEs). As examples we discuss the Besov regularity (in the sense of our spaces) of forward diffusions and local times. It is shown that among our newly introduced Besov spaces there are spaces that characterize quantitative properties of directional derivatives in the Malliavin sense without computing or accessing these Malliavin derivatives explicitly. Regarding BSDEs, we deduce regularity properties of the solution processes from the Besov regularity of the initial data, in particular upper bounds for their <inline-formula content-type=math/mathml> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML alttext=upper L Subscript p> <mml:semantics> <mml:msub> <mml:mi>L</mml:mi> <mml:mi>p</mml:mi> </mml:msub> <mml:annotation encoding=application/x-tex>L_p</mml:annotation> </mml:semantics> </mml:math> </inline-formula>-variation, where the generator might be of quadratic type and where no structural assumptions, for example in terms of a forward diffusion, are assumed. As an example we treat sub-quadratic BSDEs with unbounded terminal conditions. Among other tools, we use methods from harmonic analysis. As a by-product, we improve the asymptotic behaviour of the multiplicative constant in a generalized Fefferman inequality and verify the optimality of the bound we established." @default.
• W3136240625 created "2021-03-29" @default.
• W3136240625 creator A5032516870 @default.
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• W3136240625 date "2021-07-01" @default.
• W3136240625 modified "2023-10-03" @default.
• W3136240625 title "Decoupling on the Wiener Space, Related Besov Spaces, and Applications to BSDEs" @default.
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• W3136240625 doi "https://doi.org/10.1090/memo/1335" @default.
• W3136240625 hasPublicationYear "2021" @default.
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