The soft limits of scattering amplitudes have been extensively studied due to their essential
role in the computation of physical observables in collider physics. The universal …

A short, graduate-level synthesis of recent developments in theoretical physics, from a
pioneer in the field Lectures on the Infrared Structure of Gravity and Gauge Theory presents …

We propose a world sheet formula for tree-level correlation functions describing a scalar
field with arbitrary mass and quartic self-interaction in de Sitter space, which is a simple …

A bstract We explore the logarithmic terms in the soft theorem in four dimensions by
analyzing classical scattering with generic incoming and outgoing states and one loop …

It has been argued that the symmetries of gravity at null infinity should include a Diff (S 2)
factor associated with diffeomorphisms on the celestial sphere. However, the standard …

A bstract Classical subleading soft graviton theorem in four space-time dimensions
determines the gravitational wave-form at late and early retarded time, generated during a …

A bstract In [1], logarithmic correction to subleading soft photon and soft graviton theorems
have been derived in four spacetime dimensions from the ratio of IR-finite S-matrices. This …

A bstract We study gapped 4d quantum field theories (QFTs) obtained from a relevant
deformation of a UV conformal field theory (CFT). For simplicity, we assume the existence of …

A bstract In this paper, we analyze the loop corrections to celestial OPE for gluons and
gravitons. Even at the loop level, the soft gluons and gravitons have conformal …

A bstract It has been shown that in larger than four space-time dimensions, soft factors that
relate the amplitudes with a soft photon or graviton to amplitudes without the soft particle …