| 11. |
- Bengtsson, Anders K.H., et al.
(författare)
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Uniqueness of superstring actions
- 1984
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Ingår i: Nucl.Phys.B254 (1985) 625.
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Tidskriftsartikel (refereegranskat)abstract
- We consider local counterterms to 4-dimensional gravity and 4- and 10-dimensional super-gravity theories in the light-front gauge. With the technique developed, we show that there are no local counterterms other than the lagrangian possible in the superstring thoeries. This is a strong indication that these theories are finite or at least renormalizable to allorders in the perturbation expansions.
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| 12. |
- Bengtsson, Ingemar, et al.
(författare)
-
Covariant superstrings do not admit covariant gauge fixing
- 1984
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The covariant action for superstrings is analysed by means of the Diracmethod, and the light front action is derived. The action gives riseto second class constraints which cannot be solved for in a covariant way. Covariant gauge fixing, in any conventional sense, cannot be applied, which leaves the question of covariant quantisationof the superstrings open. A similar statement holds for a masslesssupersymmetric point-particle.
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| 13. |
- Bengtsson, Ingemar, et al.
(författare)
-
Light cone actions for gravity and higher spins: some further results
- 1983
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- It has been suggested that field theories for arbitrary spin can be defined,using the light front formulation of dynamics. The higher order termsin the actions are discussed in this paper. We show that the gravity actioncan be written without ``time''-derivatives in the interaction termsin a way which appears generalisable to higher spin. Some problems forhigher spins are identified and briefly discussed.
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| 14. |
- Bengtsson, Ingemar, et al.
(författare)
-
Particles, twistors and the division algebras
- 1987
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Ingår i: Nucl.Phys.B302 (1988) 81.
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Tidskriftsartikel (refereegranskat)abstract
- We study twistorial mechanics of particles and super-particles in six dimensions. To this end we formulate (in a general division algebra framework) a twistor theory in D = 6 based on quaternionic numbers, and prove the equivalence between this version of particle dynamics and the ordinary one. The super-twistors define a covariant and gauge invariant concept of a super world-line and allow us to write an action for the supersymmetric particle that is not plagued by the content of second class constraints that prevents a covariant quantization in the space-time picture. The notion and geometry of projectile twistor space, and its connection to Minkowski space, are examined and shown to directly generalize the results in D = 3, 4. Quantization is performed and analytic quaternionic eigenfunctions and integrations are discussed. We also draw some conclusions on the possible generalization to ten dimensions.
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| 15. |
- Bengtsson, Ingemar, et al.
(författare)
-
What's the matter with the Green-Schwarz action?
- 1987
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Ingår i: Phys.Lett.B203 (1988) 96.
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Tidskriftsartikel (refereegranskat)abstract
- The Green-Schwarz action describes only states with positive energy. We explain how this obstructs covariant quantisation.
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| 16. |
- Bengtsson, Viktor, 1981, et al.
(författare)
-
The B-model on the A-model NS5-brane
- 2008
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Ingår i: arXiv.org/abs/0805.1782.
-
Tidskriftsartikel (refereegranskat)abstract
- We formulate the dynamics for the NS5-brane of the A-model, via the 'maximal form' method, which couples all background fields to the world-volume. This procedure provides the extra one- and five-forms fields of the extended Hitchin model. The generalised B-model emerges as the world-volume theory of this brane. The starting point of the construction is an embedding of the brane in a superspace geometry with 16 fermionic directions. The correspondence with Hitchin's formulation in terms of pure spinors is explained.
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| 17. |
- Bengtsson, Viktor, 1981, et al.
(författare)
-
U-duality Covariant Membranes
- 2004
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Ingår i: J. High Energy Phys. 0502 (2005) 020.
-
Tidskriftsartikel (refereegranskat)abstract
- We outline a formulation of membrane dynamics in D=8 which is fully covariant under the U-duality group SL(2,Z) x SL(3,Z), and encodes all interactions to fields in the eight-dimensional supergravity, which is constructed through Kaluza--Klein reduction on T^3. Among the membrane degrees of freedom is an SL(2,R) doublet of world-volume 2-form potentials, whose quantised electric fluxes determine the membrane charges, and are conjectured to provide an interpretation of the variables occurring in minimal representations of U-duality groups. We solve the relevant equations for the action for a restricted class of supergravity backgrounds. Some comments are made on supersymmetry and lower dimensions.
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| 18. |
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| 19. |
- Berman, David S., et al.
(författare)
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Global aspects of double geometry
- 2014
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Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; 2014:9, s. article 66-19
-
Tidskriftsartikel (refereegranskat)abstract
- We consider the concept of a generalised manifold in the O(d,d) setting, i.e., in double geometry. The conjecture by Hohm and Zwiebach for the form of finite generalised diffeomorphisms is shown to hold. Transition functions on overlaps are defined. Triple overlaps are trivial concerning their action on coordinates, but non-trivial on fields, including the generalised metric. A generalised manifold is an ordinary manifold, but the generalised metric on the manifold carries a gerbe structure. We show how the abelian behaviour of the gerbe is embedded in the non-abelian T-duality group. We also comment on possibilities and difficulties in the U-duality setting.
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| 20. |
- Berman, David S., et al.
(författare)
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Holographic Noncommutativity
- 2000
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Ingår i: J. High Energy Phys. ; 05, s. 002-
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Tidskriftsartikel (refereegranskat)
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