6533b7dafe1ef96bd126e403
RESEARCH PRODUCT
A weakly random Universe?
G. YegorianVahe GurzadyanS. MirzoyanS. MirzoyanS. MirzoyanDaniele VetrugnoH. G. KhachatryanE. PoghosianT. GhahramanyanA. L. KashinA. E. AllahverdyanA. A. KocharyanA. A. Kocharyansubject
PhysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)530 Physicsmedia_common.quotation_subjectCosmic microwave backgroundIsotropyAstrophysics::Instrumentation and Methods for AstrophysicsCosmic background radiationFOS: Physical sciencesAstronomy and AstrophysicsScale (descriptive set theory)General Relativity and Quantum Cosmology (gr-qc)Astrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsGeneral Relativity and Quantum CosmologyUniverseAmplitude1912 Space and Planetary ScienceSpace and Planetary Science10231 Institute for Computational Science3103 Astronomy and AstrophysicsAnisotropyRandomnessAstrophysics - Cosmology and Nongalactic Astrophysicsmedia_commondescription
The 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, that quantifies a degree of randomness (chaos) in a set of numbers, such as measurements of the CMB temperature in some 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).
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-11-16 |