Triangle Seminars
Wednesday, 10 Apr 2019
Black holes in N=4 Super-Yang-Mills
π London
Francesco Benini
(SISSA, Trieste)
Abstract:
AdS/CFT provides a consistent non-perturbative definition of quantum
gravity in asymptotically AdS space. Black holes should correspond to
ensembles of states in the boundary field theory. By analyzing the
superconformal index of 4d N=4 SU(N) Super-Yang-Mills, with the help
of a new Bethe Ansatz type formula, we are able to exactly reproduce
the Bekenstein-Hawking entropy of BPS black holes in AdS5 x S5. The
large N limit exhibits many competing contributions and Stokes
phenomena, hinting at new physics.
AdS/CFT provides a consistent non-perturbative definition of quantum
gravity in asymptotically AdS space. Black holes should correspond to
ensembles of states in the boundary field theory. By analyzing the
superconformal index of 4d N=4 SU(N) Super-Yang-Mills, with the help
of a new Bethe Ansatz type formula, we are able to exactly reproduce
the Bekenstein-Hawking entropy of BPS black holes in AdS5 x S5. The
large N limit exhibits many competing contributions and Stokes
phenomena, hinting at new physics.
Posted by: KCL
Looking for Partially-Massless Gravity
Karapet Mkrtchyan
(Potsdam)
Abstract:
We study the possibility for a unitary theory of partially-massless (PM) spin-two field interacting with Gravity in arbitrary dimensions.
We show that parity invariant interactions respecting general covariance lead to a reconstruction of Conformal Gravity in even dimensions. In
this case the unitarity is sacrificed.
By relaxing the parity invariance, we find a possibility of a unitary theory in four dimensions, but the parity-odd cubic vertex cannot be written
in usual metric variables. We comment on possible approaches that may allow for the formulation of this theory.
Finally, by relaxing the general covariance, we show that a non-minimal coupling between massless and PM spin-two fields may lead to an
alternative possibility of a unitary theory, that necessarily involves mixed-symmetry fields.
We study the possibility for a unitary theory of partially-massless (PM) spin-two field interacting with Gravity in arbitrary dimensions.
We show that parity invariant interactions respecting general covariance lead to a reconstruction of Conformal Gravity in even dimensions. In
this case the unitarity is sacrificed.
By relaxing the parity invariance, we find a possibility of a unitary theory in four dimensions, but the parity-odd cubic vertex cannot be written
in usual metric variables. We comment on possible approaches that may allow for the formulation of this theory.
Finally, by relaxing the general covariance, we show that a non-minimal coupling between massless and PM spin-two fields may lead to an
alternative possibility of a unitary theory, that necessarily involves mixed-symmetry fields.
Posted by: IC
Thursday, 11 Apr 2019
Supersymmetric space-dependent deformations of ABJM
Matthew Roberts
(Imperial)
Abstract:
We construct new supersymmetric solutions of 11D supergravity, preserving 1/4 of the supersymmetry, that are dual to the ABJM Chern-Simons-matter theory deformed by mass terms which depend on one spatial direction. The BPS equations boil down to solving the Helmholtz equation on the complex plane giving rise to rich classes of new solutions. In particular, the construction gives rise to infinite classes of new supersymmetric Γ’β¬ΕboomerangΓ’β¬Β RG flows, as well as generalising other previously known solutions.
We construct new supersymmetric solutions of 11D supergravity, preserving 1/4 of the supersymmetry, that are dual to the ABJM Chern-Simons-matter theory deformed by mass terms which depend on one spatial direction. The BPS equations boil down to solving the Helmholtz equation on the complex plane giving rise to rich classes of new solutions. In particular, the construction gives rise to infinite classes of new supersymmetric Γ’β¬ΕboomerangΓ’β¬Β RG flows, as well as generalising other previously known solutions.
Posted by: QMW