Probability Density of Lognormal Fractional SABR Model

نویسندگان

چکیده

Instantaneous volatility of logarithmic return in the lognormal fractional SABR model is driven by exponentiation a correlated Brownian motion. Due to mixed nature driving and motions, probability density for such less studied literature. We show this paper bridge representation joint Fourier space. Evaluating along properly chosen deterministic path yields small time asymptotic expansion leading order model. A direct generalization often leads heuristic derivation large deviations principle time. Approximation implied readily obtained applying Laplace formula call or put prices comparing coefficients.

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ژورنال

عنوان ژورنال: Risks

سال: 2022

ISSN: ['2227-9091']

DOI: https://doi.org/10.3390/risks10080156