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SUMMARY:Higher derivative with constraints: exorcising Ostrogradski's ghos
 t. - Tai-jun Chen (DAMTP)
DTSTART:20130614T120000Z
DTEND:20130614T130000Z
UID:TALK44529@talks.cam.ac.uk
CONTACT:Dr Joan Camps
DESCRIPTION:Higher derivative theory\, if non-degenerate\, is known to be 
 accompanied with Ostrogradski's instability. The only way anyone has ever 
 found to avoid it is by constraints. The first part of my talk will be a p
 edagogical review of Ostrogradski's instability and Dirac's analysis of co
 nstrained systems. After that I will present how to introduce suitable con
 straints which selectively remove the unstable degrees of freedom and rend
 er Hamiltonian bounded from below. Finally I will discuss how to apply thi
 s technique to higher derivative gravity. 
LOCATION:Pavilion B Potter Room (B1.19)
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