摘要翻译:
一个篮子的状态价格密度,即使在不相关的布莱克-斯科尔斯动力学下,也不允许封闭的密度。(这句话可以被改写为对数和的陈述,尤其令人讨厌,因为这句话在金融和精算数学中使用得最频繁。)在这篇文章中,我们分别讨论了短时间和小波动率的扩展。该方法适用于具有相关性的一般多因素模型,并导致对一个普通(哈密顿)微分方程组的分析。也许令人惊讶的是,即使在两个资产布莱克-斯科尔斯的情况下(以其平坦的几何形状),扩张可以在一个关键的(篮筐)打击水平上退化;一种在迄今为止的文献中似乎没有被注意到的现象。显式的计算将这与从一个唯一的路径到一个以上的“最可能的”路径的相变联系起来(沿着这条路径,如果适当地加以条件,扩散集中在上述制度中)。这也提供了一个(可量化的)理解,一个目前没有钱的篮子选择如何准确地最终仍然是在钱里。
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英文标题:
《On the probability density function of baskets》
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作者:
Christian Bayer, Peter Friz, Peter Laurence
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最新提交年份:
2016
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分类信息:
一级分类:Mathematics 数学
二级分类:Probability 概率
分类描述:Theory and applications of probability and stochastic processes: e.g. central limit theorems, large deviations, stochastic differential equations, models from statistical mechanics, queuing theory
概率论与随机过程的理论与应用:例如中心极限定理,大偏差,随机微分方程,统计力学模型,排队论
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一级分类:Quantitative Finance 数量金融学
二级分类:Pricing of Securities 证券定价
分类描述:Valuation and hedging of financial securities, their derivatives, and structured products
金融证券及其衍生产品和结构化产品的估值和套期保值
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英文摘要:
The state price density of a basket, even under uncorrelated Black-Scholes dynamics, does not allow for a closed from density. (This may be rephrased as statement on the sum of lognormals and is especially annoying for such are used most frequently in Financial and Actuarial Mathematics.) In this note we discuss short time and small volatility expansions, respectively. The method works for general multi-factor models with correlations and leads to the analysis of a system of ordinary (Hamiltonian) differential equations. Surprisingly perhaps, even in two asset Black-Scholes situation (with its flat geometry), the expansion can degenerate at a critical (basket) strike level; a phenomena which seems to have gone unnoticed in the literature to date. Explicit computations relate this to a phase transition from a unique to more than one \"most-likely\" paths (along which the diffusion, if suitably conditioned, concentrates in the afore-mentioned regimes). This also provides a (quantifiable) understanding of how precisely a presently out-of-money basket option may still end up in-the-money.
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