LIFE-SPAN OF FAMILIES IN FOSSIL DATA FORMSq-EXPONENTIAL DISTRIBUTION

Takashi Shimada (), Satoshi Yukawa and Nobuyasu Ito
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Takashi Shimada: Department of Applied Physics, School of Engineering, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo 113-8656, Japan
Satoshi Yukawa: Department of Applied Physics, School of Engineering, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo 113-8656, Japan
Nobuyasu Ito: Department of Applied Physics, School of Engineering, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo 113-8656, Japan

International Journal of Modern Physics C (IJMPC), 2003, vol. 14, issue 09, 1267-1271

Abstract: The distribution of life span of families known as "skewed profile" is shown to be well-fitted byq-exponential function. It implies the mortality of the families has age-dependent form of∝1/(1-αt). This feature is also reproduced by the so-called "size-free" model which was proposed by the present authors.

Keywords: Evolution; life-span of families; q-exponential function; self-organized criticality (search for similar items in EconPapers)
Date: 2003
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DOI: 10.1142/S0129183103005406

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