@article{Garcia:2018:10.1103/PhysRevE.98.062107,
author = {Garcia, Millan R and Pausch, J and Walter, B and Pruessner, G},
doi = {10.1103/PhysRevE.98.062107},
journal = {Physical Review E},
title = {Field-theoretic approach to the universality of branching processes},
url = {http://dx.doi.org/10.1103/PhysRevE.98.062107},
volume = {98},
year = {2018}
}

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TY  - JOUR
AB  - Branching processes are widely used to model phenomena from networks to neuronal avalanching. In a large class of continuous-time branching processes, we study the temporal scaling of the moments of the instant population size, the survival probability, expected avalanche duration, the so-called avalanche shape, the n-point correlation function, and the probability density function of the total avalanche size. Previous studies have shown universality in certain observables of branching processes using probabilistic arguments; however, a comprehensive description is lacking. We derive the field theory that describes the process and demonstrate how to use it to calculate the relevant observables and their scaling to leading order in time, revealing the universality of the moments of the population size. Our results explain why the first and second moment of the offspring distribution are sufficient to fully characterize the process in the vicinity of criticality, regardless of the underlying offspring distribution. This finding implies that branching processes are universal. We illustrate our analytical results with computer simulations.
AU  - Garcia,Millan R
AU  - Pausch,J
AU  - Walter,B
AU  - Pruessner,G
DO  - 10.1103/PhysRevE.98.062107
PY  - 2018///
SN  - 1539-3755
TI  - Field-theoretic approach to the universality of branching processes
T2  - Physical Review E
UR  - http://dx.doi.org/10.1103/PhysRevE.98.062107
UR  - http://hdl.handle.net/10044/1/66324
VL  - 98
ER  - 

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