Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T00: Poster Session III (1pm-4pm PST)
1:00 PM,
Thursday, March 9, 2023
Room: Exhibit Hall (Forum Ballroom)
Sponsoring
Unit:
APS
Abstract: T00.00322 : Finding Dynamical Chaos in Stellar Models*
Presenter:
Ian S Edwards
(California State University Chico)
Author:
Ian S Edwards
(California State University Chico)
Collaboration:
Giovanni Paz-Silva
big range in evolution calculations for astrophysics research. Since modern stellar evolution models
can approach a precise stellar model followed by a series of equations that describe the chemical
composition, fluid dynamics, thermodynamics, and other properties of stars that are calculated by
astrophysics. These equations are highly complex, and it is in our goal to show if these equations and
stellar model simulations are chaotic. Using MESA we have modeled the main sequence evolution of
a solar-like model, and then again with a small perturbation on the order of one part in 108 on the
central hydrogen fraction to examine the divergence of the two models, and also the perturbation in
rotation in the same order of magnitude. We find that these models are indeed chaotic when rotating,
showing an exponential divergence on very short time-scales and a maximum phase space separation
of approximately 0.01 in our time scale run from 3 to 7 Gyr when we fit data to the Lyapunov
exponent. Calculations of ensembles of these models show that increment in resolution does not
increase the accuracy in the exponential growth region, which leads to being more dependent on the
time factor on each model due to evolution time process for each model. This suggests an intrinsic
limit to the precision of stellar structure and evolution models due to dynamical chaos showed in
the program and the accuracy in the program for the stars simulations.
*Chico State Enterprises
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