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Tempered relaxation equation and related generalized stable processes

  • Luisa Beghin EMAIL logo und Janusz Gajda
Veröffentlicht/Copyright: 13. November 2020
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Abstract

Fractional relaxation equations, as well as relaxation functions time-changed by independent stochastic processes have been widely studied (see, for example, [21], [33] and [11]). We start here by proving that the upper-incomplete Gamma function satisfies the tempered-relaxation equation (of index ρ ∈ (0, 1)); thanks to this explicit form of the solution, we can then derive its spectral distribution, which extends the stable law. Accordingly, we define a new class of selfsimilar processes (by means of the n-times Laplace transform of its density) which is indexed by the parameter ρ: in the special case where ρ = 1, it reduces to the stable subordinator.

Therefore the parameter ρ can be seen as a measure of the local deviation from the temporal dependence structure displayed in the standard stable case.

Acknowledgements

The authors are grateful to the referees and the Editor for many useful comments on an earlier version and to Claudio Macci for insightful discussions and suggestions.

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Received: 2019-12-27
Revised: 2020-02-08
Published Online: 2020-11-13
Published in Print: 2020-10-27

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