TY - JOUR
T1 - Topologically massive gravity at the chiral point is not unitary
AU - Giribet, G.
AU - Kleban, M.
AU - Porrati, M.
PY - 2008/10/1
Y1 - 2008/10/1
N2 - A recent paper [1] claims that topologically massive gravity contains only chiral boundary excitations at a particular value of the Chern-Simons coupling. On the other hand, propagating bulk degrees of freedom with negative norm were found even at the chiral point in [2]. The two references use very different methods, making comparison of their respective claims difficult. In this letter, we use the method of [1] to construct a tower of physical propagating bulk states satisfying standard AdS boundary conditions. Our states have finite norm, with sign opposite to that of right-moving boundary excitations. Our results thus agree with [2] and disagree with [1].
AB - A recent paper [1] claims that topologically massive gravity contains only chiral boundary excitations at a particular value of the Chern-Simons coupling. On the other hand, propagating bulk degrees of freedom with negative norm were found even at the chiral point in [2]. The two references use very different methods, making comparison of their respective claims difficult. In this letter, we use the method of [1] to construct a tower of physical propagating bulk states satisfying standard AdS boundary conditions. Our states have finite norm, with sign opposite to that of right-moving boundary excitations. Our results thus agree with [2] and disagree with [1].
KW - AdS-CFT correspondence
KW - Models of quantum gravity
UR - http://www.scopus.com/inward/record.url?scp=58149290042&partnerID=8YFLogxK
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U2 - 10.1088/1126-6708/2008/10/045
DO - 10.1088/1126-6708/2008/10/045
M3 - Article
AN - SCOPUS:58149290042
SN - 1126-6708
VL - 2008
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 10
M1 - 045
ER -