Linear Amplifier Breakdown and Concentration Properties of a Gaussian Field Given that its $\bm{L^2}$-Norm is Large

Details Linear Amplifier Breakdown and Concentration Properties of a Gaussian Field Given that its $\bm{L^2}$-Norm is Large Linear Amplifier Breakdown and Concentration Properties of a Gaussian Field Given that its $\bm{L^2}$-Norm is Large

2010-09-28

arxiv.org/abs/1009.5513v2

J. Stat. Phys. 143, 139 (2011)

Physics

Mathematical Physics

REVTeX file, 11 pages, 1 added paragraph in the introduction, 2 added references, minor modifications in the text and abstract

Scientific paper

In the context of linear amplification for systems driven by the square of a Gaussian noise, we investigate the realizations of a Gaussian field in the limit where its $L^2$-norm is large. Concentration onto the eigenspace associated with the largest eigenvalue of the covariance of the field is proved. When the covariance is trace class, the concentration is in probability for the $L^2$-norm. A stronger concentration, in mean for the sup-norm, is proved for a smaller class of Gaussian fields, and an example of a field belonging to that class is given. A possible connection with Bose-Einstein condensation is briefly discussed.

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