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Communications (nuts and bolts series)
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The supersymmetric NUTs and bolts of holography
We show that a given conformal boundary can have a rich and intricate space
of supersymmetric supergravity solutions filling it, focusing on the case where
this conformal boundary is a biaxially squashed Lens space. Generically we find
that the biaxially squashed Lens space S^3/Z_p admits Taub-NUT-AdS fillings,
with topology R^4/Z_p, as well as smooth Taub-Bolt-AdS fillings with
non-trivial topology. We show that the Taub-NUT-AdS solutions always lift to
solutions of M-theory, and correspondingly that the gravitational free energy
then agrees with the large N limit of the dual field theory free energy,
obtained from the localized partition function of a class of N=2
Chern-Simons-matter theories. However, the solutions of Taub-Bolt-AdS type only
lift to M-theory for appropriate classes of internal manifold, meaning that
these solutions exist only for corresponding classes of three-dimensional N=2
field theories.Comment: 54 pages plus 7 appendices; v2: discussion of global properties of
gauge field A in eleven dimensions improved and some parts of the paper
rewritten to reflect this, new subsections 6.4.1, 6.4.2 and appendix F added,
references added; v3: final version published in Nuclear Physics
Bolt installation tool for tightening large nuts and bolts
Large bolts and nuts are accurately tightened to structures without damaging torque stresses. There are two models of bolt installation tool. One is rigidly mounted and one is hand held. Each model includes torque-multiplier unit
Trends in mechanical fasteners
Some of the specialty fasteners which are enjoying increasing usage are: thread rolling screws, self drilling and tapping screws, locking screws, tamperproof fasteners, and flanged bolts and nuts. The development of an optimum metric fastener system is recommended for future fastener manufacturing
The Nuts and Bolts of Einstein-Maxwell Solutions
We find new non-supersymmetric solutions of five-dimensional ungauged
supergravity coupled to two vector multiplets. The solutions are regular,
horizonless and have the same asymptotic charges as non-extremal charged black
holes. An essential ingredient in our construction is a four-dimensional
Euclidean base which is a solution to Einstein-Maxwell equations. We construct
stationary solutions based on the Euclidean dyonic Reissner-Nordstrom black
hole as well as a six-parameter family with a dyonic Kerr-Newman-NUT base.
These solutions can be viewed as compactifications of eleven-dimensional
supergravity on a six-torus and we discuss their brane interpretation.Comment: 29 pages, 3 figure
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