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arXiv 2104.04396math.PRq-fin.MF
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一类基于秩的连续半鞅

On A Class Of Rank-Based Continuous Semimartingales

David Itkin, Martin Larsson

摘要:

利用Dirichlet形式的理论,我们构造了一个大类的连续半鞅在一个开放的域$E \subset \mathbb{R}^d$,这是由基于秩的,除了名称为基础的,特征。利用Baur等人[Potential Analysis,38(4):1233- 1258,2013]的结果,我们得到了这类扩散的强Feller性质。因此,我们能够建立三重碰撞的不存在性,并获得其秩过程动力学的简化公式。我们还建立条件下的过程是遍历的。我们的主要动机是随机投资组合理论(SPT),这种类型的基于秩的扩散被用来模拟金融市场。我们表明,在SPT研究的三个主要类别的模型-阿特拉斯模型,广义波动稳定模型和多项式模型-是我们的框架的特殊情况。

英文摘要:

Using the theory of Dirichlet forms we construct a large class of continuous semimartingales on an open domain $E \subset \mathbb{R}^d$, which are governed by rank-based, in addition to name-based, characteristics. Using the results of Baur et al. [Potential Analysis, 38(4):1233-1258,2013] we obtain a strong Feller property for this class of diffusions. As a consequence we are able to establish the nonexistence of triple collisions and obtain a simplified formula for the dynamics of its rank process. We also establish conditions under which the process is ergodic. Our main motivation is Stochastic Portfolio Theory (SPT), where rank-based diffusions of this type are used to model financial markets. We show that three main classes of models studied in SPT -- Atlas models, generalized volatility-stabilized models and polynomial models -- are special cases of our framework.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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