L\'evy-areas of Ornstein-Uhlenbeck processes in Hilbert-spaces
  In this paper we investigate the existence and some useful properties of the L\'evy areas of Ornstein-Uhlenbeck processes associated to Hilbert-space-valued fractional Brownian-motions with Hurst parameter $H\in (1/3,1/2]$. We prove that this stochastic area has a H\"older-continuous version with sufficiently large H\"older-exponent and that can be approximated by smooth areas. In addition, we prove the stationarity of this area. 
Mar\'ia J. Garrido-Atienza, Kening Lu, Bj\"orn Schmalfuss
math.DS