Title: Low-acceleration gravitational anomaly in orbital motions of wide binary stars: an observation-triggered new revolution in physics
일시: 2025년 4월 15일(화), 17시
Speaker: 채규현 (세종대학교)
Abstract:
Two stars orbiting each other under their mutual gravitational force are known to obey Kepler’s laws. However, a multitude of recent analyses of binary stars show that there is a limit on the validity of Kepler’s laws. When the separation between the pair is wider than about 2000 astronomical units so that the mutual gravitational acceleration is weaker than about one billionth of a meter per second squared, the orbital motion deviates from the Newtonian expectation, favoring MOND (Modified Newtonian Dynamics)-type modified gravity.
The breakdown of standard gravity implies a new scientific revolution and has tremendous implications for the concept of dark matter, astrophysics, cosmology, and fundamental theories of physics. In this talk, I will describe methodologies for inferring gravity using wide binaries and discuss the main results.