The hierarchical Cannings process in random environment

Beitrag in einer Fachzeitschrift
(Online-Publikation)


Details zur Publikation

Autorinnen und Autoren: Greven A, den Hollander F, Klimovsky A
Zeitschrift: ALEA : Latin American Journal of Probability and Mathematical Statistics
Jahr der Veröffentlichung: 2017
ISSN: 1980-0436


Abstract


In an earlier paper, we introduced and studied a system of hierarchically interacting

measure-valued random processes that arises as the continuum limit of a large population

of individuals carrying different types. Individuals live in colonies labelled by the hierar-

chical group of order N , and are subject to migration and resampling on all hierarchical

scales simultaneously. The resampling mechanism is such that a random positive fraction

of the population in a block of colonies inherits the type of a random single individual in

that block, which is why we refer to our system as the hierarchical Cannings process. Be-

fore resampling in a block takes place, all individuals in that block are relocated uniformly,

which we call reshuffling.

In the present paper, we study a version of the hierarchical Cannings process in random

environment, namely, the resampling measures controlling the change of type of individuals

in different blocks are chosen randomly with a given mean and are kept fixed in time, i.e.,

we work in the quenched setting. We give a necessary and sufficient condition under

which a multi-type equilibrium is approached (= coexistence) as opposed to a mono-type

equilibrium (= clustering). Moreover, in the hierarchical mean-field limit N → ∞, with

the help of a renormalization analysis we obtain a full picture of the space-time scaling

behaviour of block averages on all hierarchical scales simultaneously. We show that the

k-block averages are distributed as the superposition of a Fleming-Viot diffusion with a

deterministic volatility constant d k and a Cannings process with a random jump rate,

both depending on k. In the random environment d k turns out to be smaller than in

the homogeneous environment of the same mean. We investigate how d k scales with k.

This leads to five universality classes of cluster formation in the mono-type regime. We

find that if clustering occurs, then the random environment slows down the growth of the

clusters, i.e., enhances the diversity of types. In some universality classes the growth of

the clusters depends on the realisation of the random environment.



MSC 2010: Primary 60J25, 60K35; Secondary 60G57, 60J60, 60J75, 82C28, 92D25.

Acknowledgements: AG was supported by the Deutsche Forschungsgemeinschaft (grant

DFG-GR 876/15-2), FdH was supported by the European Research Council (Advanced

Grant VARIS-267356) and by the Netherlands Organization for Scientific Research (Grav-

itation Grant NETWORKS-024.002.003), AK was supported by the Netherlands Orga-

nization for Scientific Research (grant 613.000.913). The authors are grateful to Evgeny

Verbitskiy for help with the renormalization analysis.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Greven, Andreas Prof. Dr.
Lehrstuhl für Mathematische Stochastik


Einrichtungen weiterer Autorinnen und Autoren

Leiden University
Universität Duisburg-Essen


Zitierweisen

APA:
Greven, A., den Hollander, F., & Klimovsky, A. (2017). The hierarchical Cannings process in random environment. ALEA : Latin American Journal of Probability and Mathematical Statistics.

MLA:
Greven, Andreas, Frank den Hollander, and Anton Klimovsky. "The hierarchical Cannings process in random environment." ALEA : Latin American Journal of Probability and Mathematical Statistics (2017).

BibTeX: 

Zuletzt aktualisiert 2018-17-07 um 10:23