Stochastic instantaneous volatility models such as Heston, SABR
or SV-LMM have mostly been developed to control the shape and joint
dynamics of the implied volatility surface. In principle, they are
well suited for pricing and hedging vanilla and exotic options, for
relative value strategies or for risk management. In practice
however, most SV models lack a closed form valuation for European
options. This book presents the recently developed Asymptotic Chaos
Expansions methodology (ACE) which addresses that issue. Indeed its
generic algorithm provides, for any regular SV model, the pure
asymptotes at any order for both the static and dynamic maps of the
implied volatility surface. Furthermore, ACE is programmable and
can complement other approximation methods. Hence it allows a
systematic approach to designing, parameterising, calibrating and
exploiting SV models, typically for Vega hedging or American
Monte-Carlo.
"Asymptotic Chaos Expansions in Finance" illustrates the ACE
approach for single underlyings (such as a stock price or FX rate),
baskets (indexes, spreads) and term structure models (especially
SV-HJM and SV-LMM). It also establishes fundamental links between
the Wiener chaos of the instantaneous volatility and the small-time
asymptotic structure of the stochastic implied volatility
framework. It is addressed primarily to financial mathematics
researchers and graduate students, interested in stochastic
volatility, asymptotics or market models. Moreover, as it contains
many self-contained approximation results, it will be useful to
practitioners modelling the shape of the smile and its
evolution.
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