次分数布朗运动的几点注记

假设SH={StH,t≥0}是指标为H∈(0,1)的次分数Brown运动,证明了当h→+∞时,增量过程(ShH+t-SHh,t≥0)依分布收敛于指数H的分数Brown运动,同时讨论了与次分数Brown噪声相关联的极限定理。     

Path probability for a Brownian motion

This work reports on numerical simulations of Brownian motion in the non-dissipative limit. The objective was to prove the existence of path probability and to compute probability values for some sample paths. By simulating a large number of particles moving from point to point under Gaussian noise and conservative forces, we numerically determine that the path probability decreases exponentially with increasing Lagrangian action of the paths.     

关于Brown运动的定义

讨论Brown运动的定义、概念、背景以及与定义直接相关的一些问题。     

布朗运动跑出时的光滑性

对布朗运动停时的光滑性进行了研究。运用函数的正交分解方法，证明了只需当分数次索伯列夫空间的可积性指标与可微性指标的积乘小于1这一条件满足时，布朗运动从某个开集的跑出时属于这个分数次索伯列夫空间，解决了以往证明过程中可积性指标受状态空间维数约束的问题。     

分数布朗运动下的亚式期权定价

Mogens Bladt和Tina Hviid Rydberg的无市场假设仅利用价格过程的实际概率测度的期权保险精算定价模型,文章在标的资产服从分数布朗运动的环境下,借助保险精算的方法,给出亚式期权的定价公式,进一步论证了几何布朗运动是分数布朗运动的一种特殊情况,可以基于分数布朗运动推广原有模型.     

标准布朗运动关于曲线边界通过的概率

讨论了标准布朗运动关于曲线边界的首出时问题,求出了标准布朗运动停留在单侧、双侧曲线边界内的概率的近似表达式。     

Resonances arising from hydrodynamic memory in Brownian motion

Observation of the Brownian motion of a small probe interacting with its environment provides one of the main strategies for characterizing soft matter. Essentially, two counteracting forces govern the motion of the Brownian particle. First, the particle is driven by rapid collisions with the surrounding solvent molecules, referred to as thermal noise. Second, the friction between the particle and the viscous solvent damps its motion. Conventionally, the thermal force is assumed to be random and characterized by a Gaussian white noise spectrum. The friction is assumed to be given by the Stokes drag, suggesting that motion is overdamped at long times in particle tracking experiments, when inertia becomes negligible. However, as the particle receives momentum from the fluctuating fluid molecules, it also displaces the fluid in its immediate vicinity. The entrained fluid acts back on the particle and gives rise to long-range correlations. This hydrodynamic 'memory' translates to thermal forces, which have a coloured, that is, non-white, noise spectrum. One hundred years after Perrin's pioneering experiments on Brownian motion, direct experimental observation of this colour is still elusive. Here we measure the spectrum of thermal noise by confining the Brownian fluctuations of a microsphere in a strong optical trap. We show that hydrodynamic correlations result in a resonant peak in the power spectral density of the sphere's positional fluctuations, in strong contrast to overdamped systems. Furthermore, we demonstrate different strategies to achieve peak amplification. By analogy with microcantilever-based sensors, our results reveal that the particle-fluid-trap system can be considered a nanomechanical resonator in which the intrinsic hydrodynamic backflow enhances resonance. Therefore, instead of being treated as a disturbance, details in thermal noise could be exploited for the development of new types of sensor and particle-based assay in lab-on-a-chip applications.     

双分数布朗运动下再装期权定价模型

在标的资产服从双分数布朗运动驱动的随机微分方程,借助双分数布朗运动随机分析理论,建立双分数布朗运动环境下金融市场数学模型,运用保险精算方法,得到了双分数布朗运动环境下再装期权定价公式.     

分数布朗运动环境下最优消费资产组合

针对分数布朗运动环境下的最优消费资产组合问题,运用随机最优控制理论,在给定对数效用函数条件下,得到最优消费资产组合问题的显式解.     

基于分数布朗运动下的附息债券期权定价

假设短期利率遵循分数布朗运动驱动的Hull—White模型．利用附息票债券价格服从分数布朗运动下的随机微分方程,以及偏微分方程方法等,讨论了期权到期日与延迟交付日并给出了可延期交付的欧式附息票债券期权定价模型及定价公式．     

分数布朗运动环境下缺口期权定价模型

假定股票价格遵循分数布朗运动驱动的随机微分方程,利率满足由分数布朗运动驱动的Va-sicek模型,建立了分数布朗运动环境下金融市场数学模型.利用分数布朗运动随机分析理论和保险精算方法,得到了缺口期权定价公式.     

分数布朗运动下红利亚式期权定价公式

在假定股票价格遵循由分数布朗运动驱动的随机微分方程的条件下,利用分数布朗运动随机分析理论,得到具有固定执行价格且有红利支付的几何平均亚式期权定价公式.     

分数布朗运动环境下可转换债券定价模型

假定股票价格方程遵循分数布朗运动驱动的随机微分方程,利率、波动率、支付红利率均为时间的确定性函数.利用分数布朗运动随机分析理论,建立了分数布朗运动环境下具有支付红利的金融市场数学模型,得到了分数布朗运动环境下具有支付红利的可转换债券的定价公式.     

分数布朗运动的简化和应用

近些年来,分数型布朗运动作为布朗运动的扩展形式已经引起越来越多人们的关注,它的应用也涉及到各个方面,特别是应用到河海的染污物的扩散和传播．当大量的污染物用粒子云来模拟时,就涉及到大量的计算．与布朗运动不同的是分数型布朗运动涉及到一个长期的记忆,这也带来了相当大的计算量．这里试图用简单的随机散步来逼近布朗运动,从而得到简化了的分数型布朗运动模型．并从统计的角度分析简化了的分布与原来的布朗运动的区别,并把简化了的分数型布朗运动的模型用到模拟沿海污染物的扩散．     

分数布朗运动模型下复合期权的定价

在市场股价满足分数布朗运动模型的条件下,采用风险中性定价法推导出有红利支付的标的看涨期权的看跌期权及另外3种复合期权的定价公式,所得结果类似于标准布朗运动模型下的情形.     

混合分数布朗运动环境下的交换期权定价

考虑了股票价格服从混合分数布朗运动驱动下的交换期权的定价问题。假设两种股票的价格过程都服从由混合分数布朗运动所驱动的随机微分方程,利用公平保费定价方法得到了交换期权的定价公式。     

绝对破产下的总负持续时间

考虑常利率下的贷款复合泊松模型,讨论了在绝对破产情况下的总的负持续时间,利用马氏性推导并解出总的负持续时间的拉普拉斯变换.

Abstract：

The compound Poisson risk model with debit interest is considered, and the total duration of negative surplus when absolute ruin occurs is discussed. By the strong Markov property of the model, the Laplace-Stieltjestransform of the total duration of negative surplus is obtained.