Geodesic
The Cauchy Problem for the Wave Equation on Homogeneous Trees
Matematičeskie zametki, Tome 100 (2016) no. 6, pp. 923-931.

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The wave equation on an infinite homogeneous tree is studied. For the Laplace operator, the Kirchhoff conditions are taken as the matching conditions at the vertices. A solution of the Cauchy problem is obtained and the behavior of the wave energy as time tends to infinity is described. It is shown that part of the energy does not go to infinity, but remains on the edges of the trees. The part of the energy remaining on the edges depends on the branching number.
Keywords: wave equation on a graph, distribution of energy, spectrum of the second derivative operator on a homogeneous tree. 
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A. V. Tsvetkova; A. I. Shafarevich. The Cauchy Problem for the Wave Equation on Homogeneous Trees. Matematičeskie zametki, Tome 100 (2016) no. 6, pp. 923-931. http://geodesic.mathdoc.fr/item/MZM_2016_100_6_a13/

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