Problem 1 (Ehrenfest's Diffusion Model). Let N be a container separated into the left ar he right parts by a barrier in the middle. The container is filled with K particles in tota At each time n = 1,2, · . ·, we randomly pick one particle among the K particles and pla t into the other part of the container. Let {Xn}nɛN be the stochastic process where X he number of particles in the left part of the container at time n. The state space of ti process is therefore X = {0,1, ·. . , K}. %3D i) Explain why {X„}n€N is a Markov process.

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Problem 1 (Ehrenfest's Diffusion Model). Let N be a container separated into the left and
the right parts by a barrier in the middle. The container is filled with K particles in total.
At each time n = 1, 2, · .., we randomly pick one particle among the K particles and place
it into the other part of the container. Let {Xn}n€N be the stochastic process where X, is
the number of particles in the left part of the container at time n. The state space of the
process is therefore X = {0, 1, · .. ,
(i) Explain why {Xn}nɛN is a Markov process.
(ii) Write down the transition probability matrix P for {Xn}nɛN and analyze its invariant
distribution.
Transcribed Image Text:Problem 1 (Ehrenfest's Diffusion Model). Let N be a container separated into the left and the right parts by a barrier in the middle. The container is filled with K particles in total. At each time n = 1, 2, · .., we randomly pick one particle among the K particles and place it into the other part of the container. Let {Xn}n€N be the stochastic process where X, is the number of particles in the left part of the container at time n. The state space of the process is therefore X = {0, 1, · .. , (i) Explain why {Xn}nɛN is a Markov process. (ii) Write down the transition probability matrix P for {Xn}nɛN and analyze its invariant distribution.
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