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Generalization of symmetric $α$-stable Lévy distributions for $q>1$

The $α$-stable distributions introduced by Lévy play an important role in probabilistic theoretical studies and their various applications, e.g., in statistical physics, life sciences, and economics. In the present paper we study sequences of long-range dependent random variables whose distributions have asymptotic power law decay, and which are called $(q,α)$-stable distributions. These sequences are generalizations of i.i.d. $α$-stable distributions, and have not been previously studied. Long-range dependent $(q,α)$-stable distributions might arise in the description of anomalous processes in nonextensive statistical mechanics, cell biology, finance. The parameter $q$ controls dependence. If $q=1$ then they are classical i.i.d. with $α$-stable Lévy distributions. In the present paper we establish basic properties of $(q,α)$-stable distributions, and generalize the result of Umarov, Tsallis and Steinberg (2008), where the particular case $α=2, q\in [1,3),$ was considered, to the whole range of stability and nonextensivity parameters $α\in (0,2]$ and $q \in [1,3),$ respectively. We also discuss possible further extensions of the results that we obtain, and formulate some conjectures.