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SUMMARY:Harvey Reall (University of Cambridge)
DTSTART:20210204T143000Z
DTEND:20210204T153000Z
DTSTAMP:20260423T022934Z
UID:jomarec/4
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/jomarec/4/">
 Well-posed formulation of Lovelock and Horndeski theories</a>\nby Harvey R
 eall (University of Cambridge) as part of JoMaReC - Joint Online Mathemati
 cal Relativity Colloquium\n\n\nAbstract\nLovelock theories are the most ge
 neral diffeomorphism invariant theories of gravity in higher dimensions wi
 th second order equations of motion. Horndeski theories are the most gener
 al diffeomorphism invariant theories of gravity coupled to a scalar field 
 in four dimensions with second order equations of motion. In this talk I w
 ill discuss well-posedness of the initial value problem for these theories
 . Previous work has shown that (generalised) harmonic gauge does not give 
 a well-posed initial value problem. I will describe recent work with Aron 
 Kovacs in which we introdued a modification of harmonic gauge that does gi
 ve a well-posed initial value problem provided that the theory remains “
 weakly coupled”. Our modified harmonic gauge may also have applications 
 in conventional GR.\n
LOCATION:https://researchseminars.org/talk/jomarec/4/
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