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Stretched exponentials from superstatistics

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  • Beck, Christian

Abstract

Distributions exhibiting fat tails occur frequently in many different areas of science. A dynamical reason for fat tails can be a so-called superstatistics, where one has a superposition of local Gaussians whose variance fluctuates on a rather large spatio-temporal scale. After briefly reviewing this concept, we explore in more detail a class of superstatistics that hasn’t been subject of many investigations so far, namely superstatistics for which a suitable power βη of the local inverse temperature β is χ2-distributed. We show that η>0 leads to power-law distributions, while η<0 leads to stretched exponentials. The special case η=1 corresponds to Tsallis statistics and the special case η=-1 to exponential statistics of the square root of energy. Possible applications for granular media and hydrodynamic turbulence are discussed.

Suggested Citation

  • Beck, Christian, 2006. "Stretched exponentials from superstatistics," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 365(1), pages 96-101.
    • Handle: RePEc:eee:phsmap:v:365:y:2006:i:1:p:96-101
    DOI: 10.1016/j.physa.2006.01.030
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    References listed on IDEAS

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    1. Bouchaud,Jean-Philippe & Potters,Marc, 2003. "Theory of Financial Risk and Derivative Pricing," Cambridge Books, Cambridge University Press, number 9780521819169, October.
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    Cited by:

    1. Brownlee, R.A. & Gorban, A.N. & Levesley, J., 2008. "Nonequilibrium entropy limiters in lattice Boltzmann methods," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 387(2), pages 385-406.
    2. Lubashevsky, Ihor & Friedrich, Rudolf & Heuer, Andreas & Ushakov, Andrey, 2009. "Generalized superstatistics of nonequilibrium Markovian systems," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 388(21), pages 4535-4550.
    3. K. Jose & Shanoja Naik & Miroslav Ristić, 2010. "Marshall–Olkin q-Weibull distribution and max–min processes," Statistical Papers, Springer, vol. 51(4), pages 837-851, December.
    4. Mathai, A.M. & Provost, Serge B., 2013. "Generalized Boltzmann factors induced by Weibull-type distributions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 392(4), pages 545-551.
    5. Dhannya Joseph, 2011. "Gamma distribution and extensions by using pathway idea," Statistical Papers, Springer, vol. 52(2), pages 309-325, May.
    6. Mathai, A.M. & Haubold, H.J., 2007. "Pathway model, superstatistics, Tsallis statistics, and a generalized measure of entropy," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 375(1), pages 110-122.
    7. Yusuke Uchiyama & Takanori Kadoya, 2018. "Superstatistics with cut-off tails for financial time series," Papers 1809.04775, arXiv.org.
    8. Mathai, A.M. & Haubold, H.J., 2007. "On generalized entropy measures and pathways," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 385(2), pages 493-500.
    9. Jose, K.K. & Naik, Shanoja R., 2008. "A class of asymmetric pathway distributions and an entropy interpretation," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 387(28), pages 6943-6951.
    10. Han, Jung Hun, 2013. "Gamma function to Beck–Cohen superstatistics," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 392(19), pages 4288-4298.

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