Quantum Universe Colloquium, Prof. Jacques Laskar, CNRS, and Observatoire de Paris
|When:||Th 18-04-2019 16:00 - 17:00|
|Speaker:||Frof. Jacques Laskar|
|Affiliation:||CNRS, and Observatoire de Paris|
|Title:||"The chaotic motion of the solar system beyond its horizon of predictability|
|Date:||18 April 2019|
|Start:||16:00 (Doors open and coffee available at 15:30)|
Since the numerical simulations of the past decades, we now know that the motion of the solar system is chaotic with an exponential divergence increasing the uncertainty in the computations by a factor of 10 every 10 million of years (Ma).
Due to the perturbation of the minor planets Ceres and Vesta, the horizon of predictability of the orbital solutions is limited to about 60 Ma, while our latest solutions should be valid over about 50 Ma. These solutions have been used for the time calibration of sedimentary records and the establishment of geological time scales, using the correlation between the computed variation of insolation on Earth and the recorded sedimentary imprint of the resulting climatic variations.
I will discuss the possibility to extend these works beyond the horizon of predictability of 60 Ma imposed by the chaotic variations of the orbits.