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Variational formulation of American option prices in the Heston Model

Damien Lamberton 1, 2 Giulia Terenzi 1, 3
2 MATHRISK - Mathematical Risk handling
Inria Paris-Rocquencourt, UPEM - Université Paris-Est Marne-la-Vallée, ENPC - École des Ponts ParisTech
Abstract : We give an analytical characterization of the price function of an American option in Heston-type models. Our approach is based on variational inequalities and extends recent results of Daskalopoulos and Feehan (2011). We study the existence and uniqueness of a weak solution of the associated degenerate parabolic obstacle problem. Then, we use suitable estimates on the joint distribution of the log-price process and the volatility process in order to characterize the analytical weak solution as the solution to the optimal stopping problem. We also rely on semi-group techniques and on the affine property of the model.
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https://hal-upec-upem.archives-ouvertes.fr/hal-01649496
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Submitted on : Thursday, November 30, 2017 - 10:16:05 AM
Last modification on : Thursday, March 19, 2020 - 12:26:02 PM
Long-term archiving on: : Thursday, March 1, 2018 - 12:40:57 PM

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  • HAL Id : hal-01649496, version 1
  • ARXIV : 1711.11311

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Damien Lamberton, Giulia Terenzi. Variational formulation of American option prices in the Heston Model. 2017. ⟨hal-01649496v1⟩

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