Paper detail

Positivity of integrated random walks

Take a centered random walk S_n and consider the sequence of its partial sums A_n = S_1 + ... + S_n. Suppose S_1 is in the domain of normal attraction of an α-stable law with 1 < α<= 2. Assuming that S_1 is either right-exponential (that is P(S > x | S > 0)=e^{-ax} for some a > 0 and all x > 0) or right-continuous (skip free), we prove that p_N = P(A_1 > 0, ..., A_N > 0) ~ C_αN^{1/(2α) - 1/2} as N tends to infinity, where C_α> 0 depends on the distribution of the walk. We also consider a conditional version of this problem and study positivity of integrated discrete bridges.