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Ornstein-Uhlenbeck process conditioned to have restricted L2-norm

Frank Aurzada, Mikhail Lifshits, Max Wiegand

math.PRarXiv:2608.21090

Abstract

We condition an Ornstein-Uhlenbeck process on having an atypically small L2-norm on long time intervals. The weak limit of these conditioned processes is again an Ornstein-Uhlenbeck process, this time with a stronger mean-reverting force than the unconditioned process, which is controlled by the restriction on the L2-norm.

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