分数Brown运动驱动的随机延迟微分方程解的存在唯一性

研究了Hirst参数H>1/2分数Brown运动驱动的随机延迟微分方程(SDDE),随机积分如Duncan et al.[9]所定义的Wick-It■型随机积分,在系数具有充分正则性条件下,证明了随机延迟微分方程解的存在唯—性,其中利用了Malliavinφ-导数及随机分析。

一类特殊混合跳-扩散模型的欧式回望期权定价

利用分数Girsanov公式和分数Wick-It-Skorohod积分,建立了一个基于标准布朗运动、分数布朗运动、Poisson过程的线性组合的金融市场模型,结合Merton假设条件以及风险资产所满足的随机微分方程的Cauchy初值问题,给出了混合跳-扩散模型下的欧式看跌期权定价的Merton公式,给出了混合跳-扩散分数布朗运动下连续支付红利的欧式固定履约价和浮动履约价的看涨回望期权及看跌回望期权定价公式.数值模拟与仿真结果验证了模型的有效性和准确性.

分数布朗运动在期权定价中的应用述评

研究表明,资产的价格过程具有长期记忆性,因此将分数布朗运动应用在资产价格过程的建模中是合理的。然而,分数布朗运动是非鞅过程,通常的随机微积分法则无法对其进行有效的计算处理。针对这一问题,本文简要阐述了目前为止四种比较主流的解决方法,即Wick-Ito方法、风险偏好思想、效用最大化方法和混合布朗运动驱动。

Critical Exercise Price for American Floating Strike Lookback Option in a Mixed Jump-Diffusion Model

This paper studies the critical exercise price of American floating strike lookback options under the mixed jump-diffusion model. By using It formula and Wick-It-Skorohod integral, a new market pricing model established under the environment of mixed jumpdiffusion fractional Brownian motion. The fundamental solutions of stochastic parabolic partial differential equations are estimated under the condition of Merton assumptions. The explicit integral representation of early exercise premium and the critical exercise price are also given, then the American floating strike lookback options factorization formula is obtained, the results is generalized the classical Black-Scholes market pricing model.

开关式Hurst指数分形Black-Scholes市场中的欧式期权定价

考虑标的资产价值服从几何分形布朗运动,但其Hurst指数以Poisson过程的方式在状态(H1<a)和状态(H2>a)之间随机的转换的开关式Hurst指数分形Black-scholes市场模型中的欧式期权定价问题.得到在此模型下欧式看涨期权定价公式;并对定价公式进行简单地定性分析.

Estimating the Shareholder's Terminal Payoff in Insurer's Solvency Ratio Model under Fractional Market

The insurer's solvency ratio model in a class of fractional Black-Scholes markets is studied. In this market,the price of assets follows a Wick-It stochastic differential equation,which is driven by the fractional Brownian motion. The market coefficients of market model are deterministic functions. By the stochastic calculus of the fractional Brownian motion and the pricing formula of European call option for the fractional Brownian motion,the explicit formula for the expected present value of shareholder's terminal payoff is given. The model extends the existing results.

带跳分形市场的期权定价公式

提出了股价的分形跳跃扩散模型,求出了该模型的解,证明了分形跳跃扩散过程的It公式。在分形跳跃扩散市场是无套利的情况下,找到了一个等价鞅测定,获得了欧式期权定价公式。

European Option Pricing under a Class of Fractional Market

In order to price European contingent claim in a class of fractional Black-Scholes market,where the prices of assets follow a Wick-It stochastic differential equation driven by the fractional Brownian motion and market coefficients are deterministic functions,the pricing formula of European call option was explicitly derived by the method of the stochastic calculus of the fractional Brownian motion.A result about fractional Clark derivative was also obtained.