Undergraduate Colloquium

Title: Invasion of Alien Planet
Speaker: Jeff Xia
Speaker Info: Northwestern University
Brief Description:
Special Note:

We show very strong evidence suggesting that a large planet from outside of solar system once invaded our solar system. These evidences are uncovered through the dynamical behaviors of asteroids in the solar system:

1. The mysterious asymmetry in numbers of asteroids for Jupiter Trojans (there are two symmetric stable Lagrangian equilibrium points L4 and L5, but somehow L4 has 8300 asteroids, while L5 has only 4300 asteroids);

2. There is a group of more than 2300 asteroids called Hildas, locked in 2:3 resonance with Jupiter. The mystery is that there appears to be a desert at the most unexpected location --- no asteroids found near the center of the stable region.

3. KAM (Kolmogorov-Arnold-Moser) theory successfully predicted certain distribution of asteroids in the main asteroid belt, particularly the famous Kirkwood gap. However, near different sides Kirkwood gap, there is a clear mysterious asymmetry on the density of asteroids.

Date: Thursday, October 26, 2023
Time: 4:00 pm
Where: Lunt 105
Contact Person: Bao Le Hung
Contact email: lhvietbao@gmail.com
Contact Phone: 8725885677
Copyright © 1997-2024 Department of Mathematics, Northwestern University.