A weakly random Universe?

V Gurzadyan, A Allahverdyan, T Ghahramanyan, A Kashin, H Khachatryan, Armen Kocharyan, S Mirzoyan, E Poghosian, D Vetrugno, G Yegorian

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14 Citations (Scopus)


Cosmic microwave background (CMB) radiation is characterized by well-established scales, the 2.7 K temperature of the Planckian spectrum and the 10-5 amplitude of the temperature anisotropy. These features were instrumental in indicating the hot and equilibrium phases of the early history of the Universe and its large-scale isotropy, respectively. We now reveal one more intrinsic scale in CMB properties. We introduce a method developed originally by Kolmogorov, which quantifies a degree of randomness (chaos) in a set of numbers, such as measurements of the CMB temperature in a given region. Considering CMB as a composition of random and regular signals, we solve the inverse problem of recovering of their mutual fractions from the temperature sky maps. Deriving the empirical Kolmogorov s function in the Wilkinson Microwave Anisotropy Probe s maps, we obtain the fraction of the random signal to be about 20 per cent; i.e., the cosmological sky is a weakly random one. The paper is dedicated to the memory of Vladimir Arnold (1937-2010)
Original languageEnglish
Pages (from-to)1 - 3
Number of pages3
JournalAstronomy & Astrophysics
Publication statusPublished - 2010

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