A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Gargantuan chaotic gravitational three-body systems and their irreversibility to the Planck length
Tekijät: Boekholt TCN, Zwart SFP, Valtonen M
Kustantaja: OXFORD UNIV PRESS
Julkaisuvuosi: 2020
Journal: Monthly Notices of the Royal Astronomical Society
Tietokannassa oleva lehden nimi: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Lehden akronyymi: MON NOT R ASTRON SOC
Vuosikerta: 493
Numero: 3
Aloitussivu: 3932
Lopetussivu: 3937
Sivujen määrä: 6
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/staa452
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/46993682
Chaos is present in most stellar dynamical systems and manifests itself through the exponential growth of small perturbations. Exponential divergence drives time irreversibility and increases the entropy in the system. A numerical consequence is that integrations of the N-body problem unavoidably magnify truncation and rounding errors to macroscopic scales. Hitherto, a quantitative relation between chaos in stellar dynamical systems and the level of irreversibility remained undetermined. In this work, we study chaotic three-body systems in free fall initially using the accurate and precise N-body code Brutus, which goes beyond standard double-precision arithmetic. We demonstrate that the fraction of irreversible solutions decreases as a power law with numerical accuracy. This can be derived from the distribution of amplification factors of small initial perturbations. Applying this result to systems consisting of three massive black holes with zero total angular momentum, we conclude that up to 5 per cent of such triples would require an accuracy of smaller than the Planck length in order to produce a time-reversible solution, thus rendering them fundamentally unpredictable.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
