|
Abstract |
Twistor strings have undergone a renewal of interest since the discovery of the Cachazo-He-
Yuan formalism for scattering amplitude in field theory in 2013. These formulae deeply
challenge the way we think about scattering amplitudes in quantum field theory and are neatly
explained by the so-called ambitwistor string, a cousin of the old twistor string.
The existence of these remarkable formalisms, which I shall present during the talk, cried for a
connection to good old string theory. The answer to this question is now understood: it relies
on counter-intuitive limits and crucially, the existence of a different quantization for string
theory, which we called twisted strings. The first part of the talk will be concerned on making
that connection to string theory clear. In the second part, I will report on recent results
obtained
with Eduardo Casali on the winding modes of these twisted strings. They give rise to new
exotic target space theories, naively non unitary, but exhibiting features half way between
string and field theory. In particular, they are T-duality symmetric. |
