Triangle Seminars
Tuesday, 10 Feb 2015
Conformal symmetry and smoothness
George Papadopoulos
(King's)
Abstract:
I shall explain why there is symmetry enhancement near black hole and brane horizons. I shall also present some applications which include the classification of AdS backgrounds in supergravity.
I shall explain why there is symmetry enhancement near black hole and brane horizons. I shall also present some applications which include the classification of AdS backgrounds in supergravity.
Posted by: KCL
Wednesday, 11 Feb 2015
Higher Spins and Strings
Matthias Gaberdiel
(ETH Zurich)
Abstract:
The conjectured relation between higher spin theories on anti de-Sitter (AdS) spaces and weakly coupled conformal field theories is reviewed. I shall then outline the
evidence in favour of a concrete duality of this kind, relating a specific higher spin theory on AdS3 to a family of 2d minimal model CFTs. Finally, I shall explain how
this relation fits into the framework of the familiar stringy AdS/CFT correspondence.
The conjectured relation between higher spin theories on anti de-Sitter (AdS) spaces and weakly coupled conformal field theories is reviewed. I shall then outline the
evidence in favour of a concrete duality of this kind, relating a specific higher spin theory on AdS3 to a family of 2d minimal model CFTs. Finally, I shall explain how
this relation fits into the framework of the familiar stringy AdS/CFT correspondence.
Posted by: KCL
Thursday, 12 Feb 2015
Constraining Asymptotically Safe Inflation with cosmological observations
Alfio Bonanno
(INAF/INFN)
Extremal chiral ring states in AdS/CFT are described by free fermions
David Berenstein
(UCSB)
Abstract:
Half BPS states (operators) in N=4 SYM are famously described by free fermions both at weak and strong coupling. I describe a set of conjectures for a preferred class of states in more general conformal field theories that can be tested in supergravity for when such a free fermion description might arise and some motivation for it applying generally. The states in question belong to the chiral ring of a supersymmetric conformal field theory that extremize an additional U(1) charge for fixed dimension and can be reduced to multi-traces of a composite matrix field, which is equivalent to using Young tableaux (Schur polynomials) as a basis. The main conjecture asserts that
if the Young tableaux are orthogonal, then the set of extremal three point functions of traces to order 1/N are determined up to a single constant. The conjecture is extended further by providing an exact norm for the Schur basis and this norm arises from a set of free fermions for a generalized oscillator algebra.
Half BPS states (operators) in N=4 SYM are famously described by free fermions both at weak and strong coupling. I describe a set of conjectures for a preferred class of states in more general conformal field theories that can be tested in supergravity for when such a free fermion description might arise and some motivation for it applying generally. The states in question belong to the chiral ring of a supersymmetric conformal field theory that extremize an additional U(1) charge for fixed dimension and can be reduced to multi-traces of a composite matrix field, which is equivalent to using Young tableaux (Schur polynomials) as a basis. The main conjecture asserts that
if the Young tableaux are orthogonal, then the set of extremal three point functions of traces to order 1/N are determined up to a single constant. The conjecture is extended further by providing an exact norm for the Schur basis and this norm arises from a set of free fermions for a generalized oscillator algebra.
Posted by: QMW