The renormalization group plays an essential role in many areas of physics, both
conceptually and as a practical tool to determine the long-distance low-energy properties of …

There is almost universal agreement among astronomers that most of the mass in the
Universe and most of the mass in the Galactic halo is dark. Many lines of reasoning suggest …

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 …

In the framework of metric-affine gravity, we consider the role of the boundary term in
Symmetric Teleparallel Gravity assuming f (Q, B) models where f is a smooth function of the …

In a previous paper we observed that (classical) tree-level gauge-theory amplitudes can be
rearranged to display a duality between color and kinematics. Once this is imposed, gravity …

Quantum gravity poses the problem of merging quantum mechanics and general relativity,
the two great conceptual revolutions in the physics of the twentieth century. The loop and …

We present an identity satisfied by the kinematic factors of diagrams describing the tree
amplitudes of massless gauge theories. This identity is a kinematic analog of the Jacobi …

In Einstein's gravitational theory, the spacetime is Riemannian, that is, it has vanishing
torsion and vanishing nonmetricity (covariant derivative of the metric). In the gauging of the …

We have recently reported on a two-loop calculation showing that the S matrix of Einstein's
theory of gravity contains non-renormalizable ultraviolet divergences in four dimensions. In …

This paper describes a technique for regularizing quadratic path integrals on a curved
background spacetime. One forms a generalized zeta function from the eigenvalues of the …