187 research outputs found
Spin-Bits and N=4 SYM
We briefly review the spin-bit formalism, describing the non-planar dynamics
of the Super Yang-Mills SU(N) gauge theory. After
considering its foundations, we apply such a formalism to the sector of
purely scalar operators. In particular, we report an algorithmic formulation of
a deplanarizing procedure for local operators in the planar gauge theory, used
to obtain planarly-consistent, testable conjectures for the higher-loop
spin-bit Hamiltonians. Finally, we outlook some possible developments and
applications.Comment: 29 pages; contribution to the Proceedings of the 43rd Erice
International School of Subnuclear Physics ``Towards New Milestones in our
Quest to go Beyond the Standard Model'', Erice, Italy (29 August--7 September
2005); v2: some references adde
Perturbative and Non-Perturbative Aspects of N=8 Supergravity
Some aspects of quantum properties of N=8 supergravity in four dimensions are
discussed for non-practitioners. At perturbative level, they include the Weyl
trace anomaly as well as composite duality anomalies, the latter being relevant
for perturbative finiteness. At non-perturbative level, we briefly review some
facts about extremal black holes, their Bekenstein-Hawking entropy and
attractor flows for single- and two-centered solutions.Comment: 1+18 pages. Contribution to the Proceedings of the International
School of Subnuclear Physics, 48th Course: "What is Known and Unexpected at
LHC" Erice, Italy, Aug 29 - Sep 7 201
Symplectic Deformations of Gauged Maximal Supergravity
We identify the space of symplectic deformations of maximal gauged
supergravity theories. Coordinates of such space parametrize inequivalent
supergravity models with the same gauge group. We apply our procedure to the
SO(8) gauging, extending recent analyses. We also study other interesting
cases, including Cremmer-Scherk-Schwarz models and gaugings of groups contained
in SL(8,R) and in SU*(8).Comment: 30 pages. v2 minor clarifications. v3 extra acknowledgements, version
published in JHE
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