This thesis proposes a new perspective on scattering amplitudes in quantum field theories.
Their standard formulation in terms of sums over Feynman diagrams is replaced by a …

A bstract We consider gravitational massive scalar-scalar scattering from unitarity and
demonstrate how intermediate soft graviton behavior and the concept of extracting classical …

A bstract The scattering equations provide a powerful framework for the study of scattering
amplitudes in a variety of theories. Their derivation from ambitwistor string theory led to …

This report is centred around tree-level scattering amplitudes in pure Yang–Mills theories,
the most prominent example is given by the tree-level gluon amplitudes of QCD. I will …

A bstract We introduce a natural generalization of the scattering equations, which connect
the space of Mandelstam invariants to that of points on ℂℙ 1, to higher-dimensional …

We explain a procedure to manifest the Bern–Carrasco–Johansson duality between color
and kinematics in n-point one-loop amplitudes of a variety of supersymmetric gauge …

A bstract We show how one-loop corrections to scattering amplitudes of scalars and gauge
bosons can be obtained from tree amplitudes in one higher dimension. Starting with a …

A bstract We prove that the scattering equation formalism for Yang-Mills amplitudes can be
used to make manifest the theory's color-kinematics duality. This is achieved through a …

We show that the forward limit of tree-level scattering equations with two massive particles
yields the SL (2, C)-covariant form of the one-loop scattering equations recently proposed by …

A bstract In this paper, we study from various perspectives the expansion of tree level single
trace Einstein-Yang-Mills amplitudes into linear combination of color-ordered Yang-Mills …