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Physical theories combine to support and complement each other. In many investigations we may neglect the high-energy phenomena of the standard model. Then we may apply well known theories of matter at low energy. Some such theories present closed formal structures apparently faithfully mirroring the structure of reality. Classical mechanics and Maxwellian… (More)

- G Oshanin, O Vasilyev, P L Krapivsky, J Klafter
- Proceedings of the National Academy of Sciences…
- 2009

We study the survival of a prey that is hunted by N predators. The predators perform independent random walks on a square lattice with V sites and start a direct chase whenever the prey appears within their sighting range. The prey is caught when a predator jumps to the site occupied by the prey. We analyze the efficacy of a lazy, minimal-effort evasion… (More)

We investigate two complementary problems related to maintaining the relative positions of N random walks on the line: (i) the leader problem, that is, the probability L N (t) that the leftmost particle remains the leftmost as a function of time and (ii) the laggard problem, the probability R N (t) that the rightmost particle never becomes the leftmost. We… (More)

We study a class of directed random graphs. In these graphs, the interval [0, x] is the vertex set, and from each y ∈ [0, x], directed links are drawn to points in the interval (y, x] which are chosen uniformly with density one. We analyze the length of the longest directed path starting from the origin. In the x → ∞ limit, we employ traveling wave… (More)

- P L Krapivsky
- 1994

A diffusion-limited aggregation process, in which clusters coalesce by means of 3-particle reaction, A + A + A → A, is investigated. In one dimension we give a heuristic argument that predicts logarithmic corrections to the mean-field asymptotic behavior for the concentration of clusters of mass m at time t, C m (t) ∼ m −1/2 (log(t)/t) 3/4 , for 1 ≪ m ≪ t/… (More)

We investigate the kinetics of submonolayer epitaxial growth which is driven by a fixed flux of monomers onto a substrate. Adatoms diffuse on the surface, leading to irreversible aggregation of islands. We also account for the effective diffusion of islands, which originates from hopping processes of their constituent adatoms, on the kinetics. When the… (More)

- P L Krapivsky
- 2014

We investigate choice-driven network growth. In this model, nodes are added one by one according to the following procedure: for each addition event a set of target nodes is selected, each according to linear preferential attachment, and a new node attaches to the target with the highest degree. Depending on precise details of the attachment rule, the… (More)

- Nikolai Brilliantov, P L Krapivsky, +4 authors Jürgen Schmidt
- Proceedings of the National Academy of Sciences…
- 2015

Saturn's rings consist of a huge number of water ice particles, with a tiny addition of rocky material. They form a flat disk, as the result of an interplay of angular momentum conservation and the steady loss of energy in dissipative interparticle collisions. For particles in the size range from a few centimeters to a few meters, a power-law distribution… (More)

- P. L. KRAPIVSKY
- 2010

How do individuals accumulate wealth as they interact economically? We outline the consequences of a simple microscopic model in which repeated pairwise exchanges of assets between individuals build the wealth distribution of a population. This distribution is determined for generic exchange rules — transactions that involve a fixed amount or a fixed… (More)

- P. L. Krapivsky
- 2008

We investigate coarsening and persistence in the voter model by introducing the quantity P n (t), defined as the fraction of voters who changed their opinion n times up to time t. We show that P n (t) exhibits scaling behavior that strongly depends on the dimension as well as on the initial opinion concentrations. Exact results are obtained for the average… (More)

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