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Bifurcation Gaps in Asymmetric and High-Dimensional Hypercycles
KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).
Vise andre og tillknytning
2018 (engelsk)Inngår i: International Journal of Bifurcation and Chaos in Applied Sciences and Engineering, ISSN 0218-1274, Vol. 28, nr 1, artikkel-id 1830001Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Hypercycles are catalytic systems with cyclic architecture. These systems have been suggested to play a key role in the maintenance and increase of information in prebiotic replicators. It is known that for a large enough number of hypercycle species (n > 4) the coexistence of all hypercycle members is governed by a stable periodic orbit. Previous research has characterized saddle-node (s-n) bifurcations involving abrupt transitions from stable hypercycles to extinction of all hypercycle members, or, alternatively, involving the outcompetition of the hypercycle by so-called mutant sequences or parasites. Recently, the presence of a bifurcation gap between a s-n bifurcation of periodic orbits and a s-n of fixed points has been described for symmetric five-member hypercycles. This gap was found between the value of the replication quality factor Q from which the periodic orbit vanishes (QPO) and the value where two unstable (nonzero) equilibrium points collide (QSS). Here, we explore the persistence of this gap considering asymmetries in replication rates in five-member hypercycles as well as considering symmetric, larger hypercycles. Our results indicate that both the asymmetry in Malthusian replication constants and the increase in hypercycle members enlarge the size of this gap. The implications of this phenomenon are discussed in the context of delayed transitions associated to the so-called saddle remnants.

sted, utgiver, år, opplag, sider
World Scientific Publishing Co. Pte Ltd , 2018. Vol. 28, nr 1, artikkel-id 1830001
Emneord [en]
Bifurcations, hypercycles, origins of life, complex systems, periodic orbits
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-224711DOI: 10.1142/S021812741830001XISI: 000426585500001Scopus ID: 2-s2.0-85042766543OAI: oai:DiVA.org:kth-224711DiVA, id: diva2:1193123
Merknad

QC 20180326

Tilgjengelig fra: 2018-03-26 Laget: 2018-03-26 Sist oppdatert: 2018-03-26bibliografisk kontrollert

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