New ambitwistor string theories

@article{Casali2015NewAS,
  title={New ambitwistor string theories},
  author={Eduardo Casali and Yvonne Geyer and Lionel Mason and Ricardo Monteiro and Kai A. Roehrig},
  journal={Journal of High Energy Physics},
  year={2015},
  volume={2015},
  pages={1-29}
}
A bstractWe describe new ambitwistor string theories that give rise to the recent amplitude formulae for Einstein-Yang-Mills, (Dirac)-Born-Infeld, Galileons and others introduced by Cachazo, He and Yuan. In the case of the Einstein-Yang-Mills amplitudes, an important role is played by a novel worldsheet conformal field theory that provides the appropriate colour factors precisely without the spurious multitrace terms of earlier models that had to be ignored by hand. This is needed to obtain the… 

Supertwistor description of ambitwistor strings

A new ambitwistor string is constructed based on a ten-dimensional super-twistor model for the massless superparticle. Although covariant quantization is complicated by reducibility issues, a

A gluing operator for the ambitwistor string

A bstractWe present a new operator in the ambitwistor string which glues together correlators with fewer points or of lower genus. It underpins the recursive construction of tree-level CHY scattering

Heterotic and bosonic string amplitudes via field theory

A bstractPrevious work has shown that massless tree amplitudes of the type I and IIA/B superstrings can be dramatically simplified by expressing them as double copies between field-theory amplitudes

A Pure Spinor Twistor Description of Ambitwistor Strings

We present a novel ten-dimensional description of ambitwistor strings. This formulation is based on a set of supertwistor variables involving pure spinors and a set of constraints previously

Celestial double copy from the worldsheet

Using the ambitwistor string, we compute tree-level celestial amplitudes for biadjoint scalars, Yang-Mills and gravity to all multiplicities. They are presented in compact CHY-like formulas with

Amplitudes on plane waves from ambitwistor strings

A bstractIn marked contrast to conventional string theory, ambitwistor strings remain solvable worldsheet theories when coupled to curved background fields. We use this fact to consider the

Gluons and gravitons at one loop from ambitwistor strings

A bstractWe present new and explicit formulae for the one-loop integrands of scattering amplitudes in non-supersymmetric gauge theory and gravity, valid for any number of particles. The results

Einstein-Yang-Mills from pure Yang-Mills amplitudes

A bstractWe present new relations for scattering amplitudes of color ordered gluons and gravitons in Einstein-Yang-Mills theory. Tree-level amplitudes of arbitrary multiplicities and polarizations

Factorization of chiral string amplitudes

A bstractWe re-examine a closed-string model defined by altering the boundary conditions for one handedness of two-dimensional propagators in otherwise-standard string theory. We evaluate the
...

References

SHOWING 1-10 OF 50 REFERENCES

Ambitwistor strings and the scattering equations

A bstractWe show that string theories admit chiral infinite tension analogues in which only the massless parts of the spectrum survive. Geometrically they describe holomorphic maps to spaces of

A worldsheet theory for supergravity

A bstractWe present a worldsheet theory that describes maps into a curved target space equipped with a B-field and dilaton. The conditions for the theory to be consistent at the quantum level can be

Ambitwistor strings and the scattering equations at one loop

A bstractAmbitwistor strings are chiral, infinite tension analogues of conventional string theory whose target space is the space of complex null geodesics and whose spectrum consists exclusively of

Soft theorems from conformal field theory

A bstractStrominger and collaborators recently proposed that soft theorems for gauge and gravity amplitudes can be interpreted as Ward identities of a 2d CFT at null infinity. In this paper, we will

Infinite tension limit of the pure spinor superstring

A bstractMason and Skinner recently constructed a chiral infinite tension limit of the Ramond-Neveu-Schwarz superstring which was shown to compute the Cachazo-He-Yuan formulae for tree-level d = 10

Ambitwistor pure spinor string in a type II supergravity background

A bstractWe construct the ambitwistor pure spinor string in a general type II supergravity background in the semi-classical regime. Almost all supergravity constraints are obtained from nilpotency of

Twistor Strings for N=8 Supergravity

This paper presents a worldsheet theory describing holomorphic maps to twistor space with N fermionic directions. The theory is anomaly free when N=8. Via the Penrose transform, the vertex operators

Scattering equations, supergravity integrands, and pure spinors

A bstractThe tree-level S-matrix of type II supergravity can be computed in scattering equation form by correlators in a worldsheet theory analogous to a chiral, infinite tension limit of the pure

Infrared behaviour of the one-loop scattering equations and supergravity integrands

A bstractThe recently introduced ambitwistor string led to a striking proposal for one-loop maximal supergravity amplitudes, localised on the solutions of the ambitwistor one-loop scattering

Perturbative Gauge Theory as a String Theory in Twistor Space

Perturbative scattering amplitudes in Yang-Mills theory have many unexpected properties, such as holomorphy of the maximally helicity violating amplitudes. To interpret these results, we Fourier