A comparison principle between rough and non-rough Heston models—with applications to the volatility surface

A comparison principle between rough and non-rough Heston models—with applications to the volatility surface
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粗糙和非粗糙 Heston 模型的比较原理及其在波动率表面上的应用

DOI:
10.1080/14697688.2020.1714702
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发表时间:
2020
影响因子:
1.3
通讯作者:
A. Majid
A. Majid
中科院分区:
经济学3区
文献类型:
--
作者:
M. Keller-Ressel;A. Majid

文献摘要

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我们提出了一些相关的比较结果,允许人们比较随机波动的粗糙和非粗糙 Heston 模型之间的矩爆炸时间、矩生成函数和临界矩。所有结果均基于某些非线性 Volterra 积分方程的比较原理。我们的矩爆炸时间上限与 Gerhold、Gerstenecker 和 Pinter [粗 Heston 模型中的矩爆炸。经济与金融决策,2019,42, 575–608] 引入的界限不同,并且对于典型参数值更严格。结果可以直接转化为粗赫斯顿模型和非粗赫斯顿模型隐含方差渐近斜率的比较原理。该原理表明,粗糙赫斯顿模型与非粗糙赫斯顿模型中隐含方差斜率的比率至少随着小期限的幂律行为而增加。
We present a number of related comparison results, which allow one to compare moment explosion times, moment generating functions and critical moments between rough and non-rough Heston models of stochastic volatility. All results are based on a comparison principle for certain non-linear Volterra integral equations. Our upper bound for the moment explosion time is different from the bound introduced by Gerhold, Gerstenecker and Pinter [Moment explosions in the rough Heston model.Decisions in Economics and Finance, 2019,42, 575–608] and tighter for typical parameter values. The results can be directly transferred to a comparison principle for the asymptotic slope of implied variance between rough and non-rough Heston models. This principle shows that the ratio of implied variance slopes in the rough versus non-rough Heston model increases at least with power-law behavior for small maturities.
DOI: 10.1111/j.1467-9965.2010.00423.x
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