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- Niels Emil Jannik Bjerrum-Bohr, David C. Dunbar, H. Ita, Warren B. Perkins, Kasper Risager
- 2005

We obtain a CSW-style formalism for calculating graviton scattering amplitudes and prove its validity through the use of a special type of BCFW-like parameter shift. The procedure is also illustrated… (More)

- Steven J. Bidder, Niels Emil Jannik Bjerrum-Bohr, David C. Dunbar, Warren B. Perkins

Generalised unitarity techniques are used to calculate the coefficients of box and triangle integral functions of one-loop gluon scattering amplitudes in gauge theories with N < 4 super-symmetries.… (More)

The zero modes and current carrying capability of a cosmic string formed at one phase transition can be modified at subsequent phase transitions. A new, generalised index theorem is derived that is… (More)

- Steven J. Bidder, Niels Emil Jannik Bjerrum-Bohr, David C. Dunbar, Warren B. Perkins
- 2005

We examine the coefficients of the box functions in N = 1 supersymmetric one-loop amplitudes. We present the box coefficients for all six point N = 1 amplitudes and certain all n example… (More)

- Steven J. Bidder, David C. Dunbar, Warren B. Perkins
- 2005

We show how Supersymmetric Ward identities can be used to obtain amplitudes involving gluinos or adjoint scalars from purely gluonic amplitudes. We obtain results for all one-loop six-point NMHV… (More)

The Friedmann equation for a positive tension brane situated between two bulk spacetimes that posses the same 5D cosmological constant, but which does not posses a Z2 symmetry of the metric itself is… (More)

We present a systematic determination of the order ¯ h fermionic energy shift when an electroweak string is perturbed. We show that the combined effect of zero modes, bound states and continuum… (More)

- David C. Dunbar, Warren B. Perkins
- Physical review letters
- 2016

We present an analytic expression for the six-point all-plus helicity amplitude in QCD at two loops. We compute the rational terms in a compact analytic form organized by their singularity structure.

- Kasper Risager, Steven J. Bidder, Warren B. Perkins
- 2005

We use Supersymmetric Ward Identities and quadruple cuts to generate n-pt NMHV amplitudes involving gluinos and adjoint scalars from purely gluonic amplitudes. We present a set of factors that can be… (More)

“Three-mass triangles” are a class of integral functions appearing in oneloop gauge theory amplitudes. We discuss how the complex analytic properties and singularity structures of these amplitudes… (More)