15-20 June 2014
Laurentian University / Université Laurentienne
America/Toronto timezone
Welcome to the 2014 CAP Congress! / Bienvenue au congrès de l'ACP 2014!

Angular Momentum Conservation in the Earth-Moon System: A Quasilocal Approach

20 Jun 2014, 11:30
FA-054+5+6 (Laurentian University / Université Laurentienne)


Laurentian University / Université Laurentienne

Sudbury, Ontario
Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition) Theoretical Physics / Physique théorique (DTP-DPT) (F-PLEN1) - CAP Best Student Presentations Final Competition / Session plénière - Compétition finale de l'ACP pour les meilleures communications étudiantes


Ms Melanie Chanona (University of Waterloo)


The nature of Earth-Moon interactions results in a complex astrophysical system. Due to subtle effects from the tidal gravitational field of the moon, the Earth's spin angular momentum is actually decreasing over time. But conservation of angular momentum requires that this be compensated for by altering the moon's orbit. I present a novel method of analyzing this interaction using a quasilocal approach that produces a highly general conservation law. Through the use of Rigid Quasilocal Frames (RQFs), we take a more natural approach to analyzing systems of interacting bodies that, unlike traditional methods, does not require a local defintion of gravitational energy or spacetime symmetries. We demonstrate this by considering the example of the Earth-Moon system and calculating the recession of the moon to be 3.8 cm/year - exactly the experimental result.

Primary author

Ms Melanie Chanona (University of Waterloo)


Dr Paul McGrath (University of Waterloo) Dr Richard Epp (University of Waterloo) Dr Robert Mann (Univeristy of Waterloo)

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