Akahori, Jiro; Song, Xiaoming; Wang, Tai-Ho - In: Risks : open access journal 10 (2022) 8, pp. 1-27
Instantaneous volatility of logarithmic return in the lognormal fractional SABR model is driven by the exponentiation of a correlated fractional Brownian motion. Due to the mixed nature of driving Brownian and fractional Brownian motions, probability density for such a model is less studied in...