15 citations · 20 across the 8 of their papers we have counts for
9 papers
Strongly mixed cosmological collider at unequal sound speeds
Javier Huenupi, Gonzalo A. Palma, Spyros Sypsas
We derive the canonically normalized modes of a two-field inflationary system with arbitrary constant quadratic mixing and unequal sound speeds and for the curvature an…
Pushing the Primordial Frontier: Cosmological Collider Signatures at Strong Mixing
Javier Huenupi, Claudio Muñoz, Gonzalo A. Palma +1
We develop an analytic treatment of primordial non-Gaussianity in multifield inflation that is nonperturbative in the constant curvature--isocurvature mixing strength . Using ex…
Pushing the Primordial Frontier: Exact Linear Solutions in Multifield Inflation
Javier Huenupi, Claudio Muñoz, Gonzalo A. Palma +1
We present exact analytic solutions for the linear dynamics of a two-field inflationary system in which the primordial curvature perturbation is coupled to an isocurvature pert…
Confronting infrared divergences in de Sitter: loops, logarithms and the stochastic formalism
Gonzalo A. Palma, Spyros Sypsas, Danilo Tapia
A well-established result in quantum field theory in four-dimensional de Sitter space is that the vacuum state of a massless scalar field breaks the de Sitter isometry group, leadi…
A note on loop resummation in de Sitter spacetime with the wavefunction of the universe approach
Javier Huenupi, Ellie Hughes, Gonzalo A. Palma +1
We analyze the computation of -point correlation functions in de Sitter spacetime, including loop corrections, using the wavefunction of the universe approach. This method consi…
Particle creation from non-geodesic trajectories in multifield inflation
Nicolás Parra, Spyros Sypsas, Gonzalo A. Palma +1
Particle production in de Sitter spacetime arises from the exponential expansion of space, rendering the Bunch-Davies vacuum perceived as a particle-containing state by late-time o…
Regularizing infrared divergences in de Sitter spacetime: Loops, dimensional regularization, and cutoffs
Javier Huenupi, Ellie Hughes, Gonzalo A. Palma +1
Correlation functions of light scalar fields in de Sitter spacetime, computed via standard perturbation theory, often exhibit secular growth characterized by time-dependent diverge…
Revisiting stochastic inflation with perturbation theory
Gonzalo A. Palma, Spyros Sypsas
A long-standing problem in primordial cosmology is to understand the precise relation between the stochastic formalism and standard perturbation theory for light scalar fields in i…
Non-Gaussian statistics of de Sitter spectators: A perturbative derivation of stochastic dynamics
Gonzalo A. Palma, Spyros Sypsas
Scalar fields interacting with the primordial curvature perturbation during inflation may communicate their statistics to the latter. This situation motivates the study of how the…