Gravity in Twistor Space and its Grassmannian Formulation
نویسندگان
چکیده
منابع مشابه
Gravity in Twistor Space and its Grassmannian Formulation
We prove the formula for the complete tree-level S-matrix of N = 8 supergravity recently conjectured by two of the authors. The proof proceeds by showing that the new formula satisfies the same BCFW recursion relations that physical amplitudes are known to satisfy, with the same initial conditions. As part of the proof, the behavior of the new formula under large BCFW deformations is studied. A...
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Tree amplitudes in gravity theories can be computed from those of gauge theory using the KLT relations [1]. Inspired by this observation, investigations [2,3,4,5] have been carried out in the hope of discovering a deeper connection at the perturbative level between N = 8 supergravity [6] and N = 4 super Yang-Mills. A link between these theories, beyond structural similarities like the non-abeli...
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At tree-level, gravity amplitudes are obtainable directly from gauge theory amplitudes via the Kawai, Lewellen and Tye closed-open string relations. We explain how the unitarity method allows us to use these relations to obtain coefficients of box integrals appearing in one-loop N = 8 supergravity amplitudes from the recent computation of the coefficients for N = 4 super-Yang-Mills nonmaximally...
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We elucidate the one-loop twistor-space structure corresponding to momentum-space MHV diagrams. We also discuss the infrared divergences, and argue that only a limited set of MHV diagrams contain them. We show how to introduce a twistor-space regulator corresponding to dimensional regularization for the infrared-divergent diagrams. We also evaluate explicitly the ‘holomorphic anomaly’ pointed o...
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In this talk new formulations of the Green–Schwarz heterotic strings in D dimensions that involve commuting spinors, are reviewed. These models are invariant under n–extended, world sheet supersymmetry as well as under N = 1, target space supersymmetry where n ≤ D − 2 and D = 3, 4, 6, 10. The world sheet supersymmetry replaces n components (and provides a geometrical meaning) of the κ–symmetry ...
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ژورنال
عنوان ژورنال: Symmetry, Integrability and Geometry: Methods and Applications
سال: 2014
ISSN: 1815-0659
DOI: 10.3842/sigma.2014.051