Unimodular gravity (UG) is an alternative to general relativity (GR) which, however, is so
closely related to the latter that one can wonder to what extent they are different. The …

The purpose of this review is to bridge the gap between a standard course in quantum field
theory and recent fascinating developments in the studies of on-shell scattering amplitudes …

A bstract Quantum scattering amplitudes for massive matter have received new attention in
connection to classical calculations relevant to gravitational-wave physics. Amplitude …

The unitarity of time evolution, or colloquially the conservation of probability, sits at the heart
of our descriptions of fundamental interactions via quantum field theory. The implications of …

Providing a comprehensive, pedagogical introduction to scattering amplitudes in gauge
theory and gravity, this book is ideal for graduate students and researchers. It offers a …

A bstract Perturbative scattering amplitudes in gauge theories have remarkable simplicity
and hidden infinite dimensional symmetries that are completely obscured in the …

We present a compact formula for the complete tree-level S-matrix of pure Yang-Mills and
gravity theories in arbitrary spacetime dimensions. The new formula for the scattering of n …

The single-soft-graviton limit of any quantum gravity scattering amplitude is given at leading
order by the universal Weinberg pole formula. Gauge invariance of the formula follows from …

We give an explicit recursive formula for the all ℓ-loop integrand for scattering amplitudes
in\(\mathcal {N}= 4\) SYM in the planar limit, manifesting the full Yangian symmetry of the …

We explore consequences of the recently discovered duality between color and kinematics,
which states that kinematic numerators in a diagrammatic expansion of gauge-theory …