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SUMMARY:Structure of dynamical Chern Simons gravity and higher derivative 
 theories - Térence Delsate (Mons University)
DTSTART:20131004T120000Z
DTEND:20131004T130000Z
UID:TALK47869@talks.cam.ac.uk
CONTACT:Helvi Witek
DESCRIPTION:I discuss the partial differential equation structure of the d
 ynamical Chern Simons (dCS) model of gravity (as time-evolution problem) a
 nd argue that this theory is not hyperbolic (and\, therefore\, not a well-
 posed initial value problem). The dCS model of gravity finds motivations i
 n String Theory and Loop Quantum Gravity as an effective low energy model.
  It consists in adding the Pontryagin density coupled to a (dilaton-like) 
 scalar field to the Einstein Hilbert Lagrangian.\nThis introduces higher d
 erivatives in the model which spoils its hyperbolic structure. Instead\, I
  will argue that trading the Einstein-Hilbert term to the conformal gravit
 y Lagrangian can in principle improve the situation by comparing the model
  to its electromagnetic counterpart.  Finally\, I will show that treating 
 dCS\ngravity perturbatively as an effective theory is well behaved to all 
 orders in the dCS coupling. 
LOCATION:Pavilion B Potter Room (B1.19)
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