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SUMMARY:Well-posed formulation of scalar-tensor effective field theory - A
 ron Kovacs (University of Cambridge)
DTSTART:20200508T120000Z
DTEND:20200508T130000Z
UID:TALK141373@talks.cam.ac.uk
CONTACT:Dejan Gajic
DESCRIPTION:Effective field theory provides a way of parameterizing strong
 -field deviations from General Relativity that might be observable in the 
 gravitational waves emitted in a black hole merger. To perform numerical s
 imulations of mergers in such theories it is necessary that the equations 
 be written in a form that admits a well-posed initial value formulation. I
 n this talk\, I will focus on gravity coupled to a scalar field including 
 the leading (4-derivative) effective field theory corrections (this includ
 es the so-called Einstein-dilaton-Gauss-Bonnet theory). I will explain how
  a new class of "modified harmonic" gauges and gauge-fixing procedures can
  be used to write the equations of motion of this theory in a form that\, 
 at weak coupling\, admits a well-posed initial value problem. I will concl
 ude by discussing possible applications to numerical relativity.
LOCATION:Zoom
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