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Ambitwistor formulations of R2 gravity and (DF)2 gauge theories
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
2017 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 11, article id 052Article in journal (Refereed) Published
Abstract [en]

We consider D-dimensional amplitudes in R-2 gravities (conformal gravity in D = 4) and in the recently introduced (DF)(2) gauge theory, from the perspective of the CHY formulae and ambitwistor string theory. These theories are related through the BCJ double-copy construction, and the (DF)(2) gauge theory obeys color-kinematics duality. We work out the worldsheet details of these theories and show that they admit a formulation as integrals on the support of the scattering equations, or alternatively, as ambitwistor string theories. For gravity, this generalizes the work done by Berkovits and Witten on conformal gravity to D dimensions. The ambitwistor is also interpreted as a D-dimensional generalization of Witten's twistor string (SYM + conformal supergravity). As part of our ambitwistor investigation, we discover another (DF)(2) gauge theory containing a photon that couples to Einstein gravity. This theory can provide an alternative KLT description of Einstein gravity compared to the usual Yang-Mills squared.

Place, publisher, year, edition, pages
SPRINGER , 2017. no 11, article id 052
Keywords [en]
Scattering Amplitudes, Conformal Field Theory
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-342395DOI: 10.1007/JHEP11(2017)052ISI: 000415211300002OAI: oai:DiVA.org:uu-342395DiVA, id: diva2:1184470
Funder
Knut and Alice Wallenberg Foundation, 2015.0083 KAW 2013.0235Available from: 2018-02-21 Created: 2018-02-21 Last updated: 2018-02-21Bibliographically approved

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