A posteriori error bounds for the Uncertain Volatility Model

Lokman A Abbas-Turki, Chassagneux Jean-Fran{\c C}ois, Jean-Philippe Lemor, Gr{\'e}goire Loeper and Simon Sananes
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Lokman A Abbas-Turki: LPSM
Chassagneux Jean-Fran{\c C}ois: ENSAE Paris
Jean-Philippe Lemor: LPSM
Gr{\'e}goire Loeper: LPSM
Simon Sananes: LPSM

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Abstract: We develop a posteriori primal-dual bounds for numerical approximations of European option prices in the Uncertain Volatility Model. Given a smooth candidate approximation of the value function, a feedback control induced by its Hessian yields a primal lower bound. On the dual side, we derive a representation based on a matrix-valued Gamma field, which provides an upper bound through a nonnegative Hamiltonian penalty. We further show that, when the dual field is generated by the candidate itself, this upper bound admits an equivalent representation in terms of the residual of the associated Black-Scholes-Barenblatt equation. We then study discrete-time approximations of these primal and dual quantities and quantify the corresponding discretization errors. Finally, we investigate their numerical evaluation for candidates obtained by stochastic policy-gradient and physics-informed neural-network methods, and compare the resulting estimates with a martingale dual approach from the stochastic-control literature. The numerical experiments highlight the importance of derivative accuracy, and in particular of second-order information, for obtaining tight a posteriori bounds.

Date: 2026-10
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