Zobrazeno 1 - 10
of 246
pro vyhledávání: '"Mason, Lionel"'
The celestial $Lw_{1+\infty}$ symmetries in asymptotically flat spacetimes have a natural geometric interpretation on twistor space in terms of Poisson diffeomorphisms. Using this framework, we provide a first-principle derivation of the canonical ge
Externí odkaz:
http://arxiv.org/abs/2407.04028
The computation of scattering amplitudes in the presence of non-trivial background gauge fields is an important but extremely difficult problem in quantum field theory. In even the simplest backgrounds, obtaining explicit formulae for processes invol
Externí odkaz:
http://arxiv.org/abs/2406.09165
Autor:
Bittleston, Roland, Bogna, Giuseppe, Heuveline, Simon, Kmec, Adam, Mason, Lionel, Skinner, David
Celestial holography has led to the discovery of new symmetry algebras arising from the study of collinear limits of perturbative gravity amplitudes in flat space. We explain from the twistor perspective how a non-vanishing cosmological constant $\La
Externí odkaz:
http://arxiv.org/abs/2403.18011
Carrollian holography aims to express gravity in four-dimensional asymptotically flat spacetime in terms of a dual three-dimensional Carrollian CFT living at null infinity. Carrollian amplitudes are massless scattering amplitudes written in terms of
Externí odkaz:
http://arxiv.org/abs/2312.10138
Publikováno v:
Class.Quant.Grav. 41: 015030, 2024
We derive exact solutions of massless free field equations and tree-level two-point amplitudes up to spin 2 on self-dual Taub-NUT space-time, as well as on its single copy, the self-dual dyon. We use Killing spinors to build analogues of momentum eig
Externí odkaz:
http://arxiv.org/abs/2309.03834
Alday & Maldacena conjectured an equivalence between string amplitudes in AdS$_5 \times S^5$ and null polygonal Wilson loops in planar $\mathcal{N}=4$ super-Yang-Mills (SYM). At strong coupling this identifies SYM amplitudes with areas of minimal sur
Externí odkaz:
http://arxiv.org/abs/2306.17044
Autor:
Bogna, Giuseppe, Mason, Lionel
The construction of perturbative quantities on non-linear backgrounds leads to the possibility of incorporating strong field effects in perturbation theory. We continue a programme to construct QFT observables on self-dual backgrounds. The approach w
Externí odkaz:
http://arxiv.org/abs/2305.07542
Ambitwistor-strings are chiral strings whose targets are spaces of complex massless particles, and whose correlation functions directly lead to simple, compact formulae for scattering amplitudes and loop integrands for massless gauge and gravity theo
Externí odkaz:
http://arxiv.org/abs/2301.11227
Autor:
Mason, Lionel
In split or Kleinian signature, twistor constructions parametrize solutions to both gauge and gravity self-duality (SD) equation from twistor data that can be expressed in terms of free smooth data without gauge freedom. Here the corresponding constr
Externí odkaz:
http://arxiv.org/abs/2212.10895
Autor:
Geyer, Yvonne, Mason, Lionel
Starting with Witten's twistor string, chiral string theories have emerged that describe field theory amplitudes without the towers of massive states of conventional strings. These models are known as ambitwistor strings due to their target space; th
Externí odkaz:
http://arxiv.org/abs/2203.13017