| 1. |
- Bengtsson, Anders K.H., et al.
(författare)
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Particles, superparticles and twistors
- 1987
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Ingår i: Phys. Rev. D36 (1987) 1766.
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Tidskriftsartikel (refereegranskat)abstract
- The covariant Green-Schwarz action for a superstring has never been quantized covariantly. The physics behind this is discussed. We then consider the corresponding point-particle action in four dimensions, and write down a master action from which it can be obtained as a gauge choice: the ‘‘space-time gauge.’’ There is also a ‘‘twistor gauge,’’ in which covariant quantization is straightforward (as noted previously by Shirafuji).
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| 2. |
- 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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| 3. |
- 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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| 4. |
- 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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| 5. |
- 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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