“…Therefore, we also allow for stochastic volatility. Unlike the stochastic volatility process driven by jumps in Mencía and Sentana (), in our setting, it is constructed by the CIR process, which is popular in financial modeling. On the probability space , the dynamics of the logarithmic VIX, denoted by X t = ln VIX t , evolve as follows: where and are correlated standard Brownian motions with ; N t is a Hawkes process with stochastic intensity λ t ; κ and θ represent the mean‐reversion speed and the long‐run mean level of X t , respectively; κ v , θ v , and σ capture the mean‐reversion speed, the long‐run mean level and the volatility of the instantaneous variance V t ; and is a family of independent and identically distributed (i.i.d) random variables with mean δ and probability density function (p.d.f.)…”