Random Walk and Other Lattice Models - City University of ...
[Pages:45]Random Walk and Other Lattice Models
Christian Benes
Brooklyn College Math Club
Brooklyn College Math Club 04-23-2013
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04-23-2013 1 / 28
Outline
1 Lattices 2 Random Walk 3 Percolation
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Lattices
Lattices: Z, Z2
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Lattices
Lattices: Z, Z2 and Z3
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Lattices
More lattices: triangular and honeycomb
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Lattices
More lattices: Archimedean Lattices
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Random Walk
Random Walk
Let Xi be independent random variables satisfying
P {Xi = 1} = p, P {Xi = -1} = 1 - p. Then Sn =
n i =1
Xi
is
called
a
simple random walk on the one-dimensional integer lattice. We will
define S0 = 0 (meaning that the random walk starts at the origin).
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Position of Walker
Random Walk
14
12
10
8
6
4
2
0
-2
-4
0
10
20
30
40
50
60
70
80
90
100
Number of Steps
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