We study a new type of long-range correlations for waves propagating in a random medium. These correlations originate from scattering events which take place close to a point source. The scattered waves propagate by diffusion to distant regions. In this way long range correlations, between any pair of distant points, are established.
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Retzker, A., Shapiro, B. Infinite range correlations of intensity in random media. Pramana - J Phys 58, 225–231 (2002). https://doi.org/10.1007/s12043-002-0009-x
- Infinite range correlation
- four-point function