No zero-crossings for random polynomials and the heat equation
By Amir Dembo, S. Mukherjee. 2012
51 citations recorded by the source corpus.
Consider random polynomial ∑ni=0aixi of independent mean-zero normal coefficients ai, whose variance is a regularly varying function (in i) of order α. We derive general criteria for continuity of persistence exponents for centered Gaussian processes, and use these to show that such polynomial has no roots in [0,1] with probability n−bα+o(1), and no roots in (1,∞) with probability n−b0+o(1), hence for n even, it has no real roots with probability n−2bα−2b0+o(1). Here, bα=0 when α≤−1 and otherwise bα∈(0,∞) is independent of the detailed regularly varying variance function and corresponds to persistence probabilities for an explicit stationary Gaussian process of smooth sample path. Further, making precise the solution ϕd(x,t) to the d-dimensional heat equation initiated by a Gaussian white noise ϕd(x,0), we confirm that the probability of ϕd(x,t)≠0 for all t∈[1,T], is T−bα+o(1), for α=d/2−1.
Subfields: Applied Mathematics, Geometry and Topology, Mathematical Physics
View Paper: https://www.semanticscholar.org/paper/9479a3947cddf2d81b098eae276bf4501fde2a2b
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In Applied Mathematics
In Geometry and Topology
In Mathematical Physics
Citations in the corpus
- Persistence and first-passage properties in nonequilibrium systems (2013, background): “In [182,183,189,190], it was shown that Kn(x) is a random variable indexed by x and hence can be viewed as a random process as a function of x.”