Convex hulls, Sticky particle dynamics and Pressure-less gas system
Moutsinga, Octave
Annales mathématiques Blaise Pascal, Tome 15 (2008), p. 57-80 / Harvested from Numdam
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We introduce a new condition which extends the definition of sticky particle dynamics to the case of discontinuous initial velocities u 0 with negative jumps. We show the existence of a stochastic process and a forward flow φ satisfying X s+t =φ(X s ,t,P s ,u s ) and dX t =E[u 0 (X 0 )/X t ]dt, where P s =PX s -1 is the law of X s and u s (x)=E[u 0 (X 0 )/X s =x] is the velocity of particle x at time s≥0. Results on the flow characterization and Lipschitz continuity are also given.

Moreover, the map (x,t)↦M(x,t):=P(X t ≤x) is the entropy solution of a scalar conservation law ∂ t M+∂ x (A(M))=0 where the flux A represents the particles momentum, and P t , u t , t > 0 is a weak solution of the pressure-less gas system of equations of initial datum P 0 ,u 0 .

Publié le : 2008-01-01
DOI : https://doi.org/10.5802/ambp.239
Classification:  52A10,  52A22,  60G44,  60H10,  60H30 
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     author = {Moutsinga, Octave},
     title = {Convex hulls, Sticky particle dynamics and Pressure-less gas system},
     journal = {Annales math\'ematiques Blaise Pascal},
     volume = {15},
     year = {2008},
     pages = {57-80},
     doi = {10.5802/ambp.239},
     zbl = {1153.76062},
     mrnumber = {2418013},
     language = {en},
     url = {http://dml.mathdoc.fr/item/AMBP_2008__15_1_57_0}
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Moutsinga, Octave. Convex hulls, Sticky particle dynamics and Pressure-less gas system. Annales mathématiques Blaise Pascal, Tome 15 (2008) pp. 57-80. doi : 10.5802/ambp.239. http://gdmltest.u-ga.fr/item/AMBP_2008__15_1_57_0/

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