20 citations · 26 across the 10 of their papers we have counts for
15 papers
Recursion Relations, Double Copy and Ward Identities
Grégoire Mathys, Guilherme L. Pimentel, Facundo Rost
We consider correlation functions of massless fields in three-dimensional Anti-de Sitter spacetime. Using embedding-space spinors akin to spinor helicity variables, we show that ma…
Feynman Tree Theorem and the Gelfand--Yaglom Formula
Ipak Fadakar, Guilherme L. Pimentel, Behrang Tafreshi
The Gelfand--Yaglom formula equates the one-loop determinant of a Schrödinger operator with Dirichlet boundary conditions to the solution of an initial value problem. Following a s…
Cosmological Collider in the Grassmannian
Mattia Arundine, Guilherme L. Pimentel
We revisit the computation of four-point wavefunction coefficients and correlators for external conformally coupled scalars exchanging a particle of generic mass and spin. Much of…
Searching for Unparticles with the Cosmic Microwave Background
Oliver H. E. Philcox, Guilherme L. Pimentel, Chen Yang
Multi-field models of inflation typically assume that interactions between particles can be treated perturbatively. Strongly-coupled models provide an intriguing alternative and ma…
The Cosmological Grassmannian
Mattia Arundine, Daniel Baumann, Mang Hei Gordon Lee +2
We introduce the orthogonal Grassmannian as a novel kinematic space for describing correlators of massless spinning fields in de Sitter space. By automatically encoding the constra…
Amplifying the Cosmological Collider with Ghost Spectators
Matheus Curado Ferreira, F. T. Falciano, Guilherme L. Pimentel
Ghost inflation is a well-known framework in which cosmological fluctuations can generate enhanced primordial non-Gaussianity, typically of the equilateral type. In its original fo…