Let be a sequence of extensions of finite groups. Assume that the coarse disjoint unions of , and have bounded geometry. The sequence is said to have an FCE-by-FCE structure, if the sequence and the sequence admit a fibred coarse embedding into Hilbert space. In this paper, we prove the coarse Novikov conjecture holds for the sequence with an FCE-by-FCE structure.
We study semilinear rough stochastic partial differential equations as introduced in Gerasimovičs and Hairer (2019) [31]. We provide -integrable a priori bounds for the solution and its linearization in case the equation is driven by a suitable Gaussian process. Using the multiplicative ergodic theorem for Banach spaces, we can deduce the existence of a Lyapunov spectrum for the linearized equation around stationary points. The existence of local stable, unstable, and center manifolds around stationary points is provided. In the case where all Lyapunov exponents are negative, local exponential stability can be deduced. We illustrate our findings with several examples.
We develop a probabilistic approach to study the volumetric and geometric properties of unit balls of finite-dimensional Lorentz sequence spaces . More precisely, we show that the empirical distribution of a random vector uniformly distributed on its volume normalized unit ball converges weakly to a compactly supported symmetric probability distribution with explicitly given density; as a consequence we obtain a weak Poincaré-Maxwell-Borel principle for any fixed number of coordinates of as . Moreover, we prove a central limit theorem for the largest coordinate of , demonstrating a quite different behavior than in the case of the balls, where a Gumbel distribution appears in the limit. Finally, we prove a Schechtman-Schmuckenschläger type result for the asymptotic volume of intersections of volume normalized and balls.