eprintid: 1182
rev_number: 9
eprint_status: archive
userid: 6
dir: disk0/00/00/11/82
datestamp: 2012-02-27 08:44:42
lastmod: 2014-12-05 09:47:55
status_changed: 2012-02-27 08:44:42
type: article
metadata_visibility: show
creators_name: Caldarelli, Guido
creators_name: Tebaldi, Claudio
creators_name: Stella, Attilio
creators_id: guido.caldarelli@imtlucca.it
creators_id: 
creators_id: 
title: Branching processes and evolution at the ends of a food chain
ispublished: pub
subjects: QC
divisions: EIC
full_text_status: public
keywords: PACS: 87.10.+e, 02.50.-r, 05.40.+j, 64.60.Lx

note: © 1996 American Physical Society
abstract: In a critically self-organized model of punctuated equilibrium, boundaries determine peculiar scaling of the size distribution of evolutionary avalanches. This is derived by an inhomogeneous generalization of standard branching processes, extending previous mean field descriptions and yielding ν = 1/2 together with τ′ = 7/4, as distribution exponent of avalanches starting from species at the ends of a food chain. For the nearest neighbor chain one obtains numerically τ′ = 1.25±0.01, and τfirst′ = 1.35±0.01 for the first return times of activity, again distinct from bulk exponents.
date: 1996-06
date_type: published
publication: Physical Review Letters
volume: 76
number: 26
publisher: American Physical Society
pagerange: 4983-4986
id_number: 10.1103/PhysRevLett.76.4983
refereed: TRUE
issn: 0031-9007
official_url: http://dx.doi.org/10.1103/PhysRevLett.76.4983
related_url_url: http://arxiv.org/abs/cond-mat/9605022
citation:   Caldarelli, Guido and Tebaldi, Claudio and Stella, Attilio  Branching processes and evolution at the ends of a food chain.  Physical Review Letters, 76 (26).  pp. 4983-4986.  ISSN 0031-9007      (1996)  
document_url: http://eprints.imtlucca.it/1182/1/PRL_Caldarelli_1996.pdf