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CATEGORIES:DAMTP Friday GR Seminar
SUMMARY:Structure of dynamical Chern Simons gravity and hi
gher derivative theories - TÃ©rence Delsate (Mons U
niversity)
DTSTART;TZID=Europe/London:20131004T130000
DTEND;TZID=Europe/London:20131004T140000
UID:TALK47869AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/47869
DESCRIPTION:I discuss the partial differential equation struct
ure of the dynamical Chern Simons (dCS) model of g
ravity (as time-evolution problem) and argue that
this theory is not hyperbolic (and\, therefore\, n
ot a well-posed initial value problem). The dCS mo
del of gravity finds motivations in String Theory
and Loop Quantum Gravity as an effective low energ
y model. It consists in adding the Pontryagin dens
ity coupled to a (dilaton-like) scalar field to th
e Einstein Hilbert Lagrangian.\nThis introduces hi
gher derivatives in the model which spoils its hyp
erbolic structure. Instead\, I will argue that tra
ding the Einstein-Hilbert term to the conformal gr
avity Lagrangian can in principle improve the situ
ation by comparing the model to its electromagneti
c counterpart. Finally\, I will show that treatin
g dCS\ngravity perturbatively as an effective theo
ry is well behaved to all orders in the dCS coupli
ng.
LOCATION:Pavilion B Potter Room (B1.19)
CONTACT:Helvi Witek
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