178 citations · 543 across the 28 of their papers we have counts for
14 papers · 1 filter
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…
Note on initial conditions for small-field inflation
Ignatios Antoniadis, Auttakit Chatrabhuti, Hiroshi Isono +1
We show that initial conditions for small-field inflation can be determined quantum mechanically by introducing a suitable flattened region in the scalar potential. The inflaton is…
Landscape tomography through primordial non-Gaussianity
Xingang Chen, Gonzalo A. Palma, Walter Riquelme +2
In this paper, we show how the structure of the landscape potential of the primordial Universe may be probed through the properties of the primordial density perturbations responsi…
Higher derivatives and power spectrum in effective single field inflation
Jinn-Ouk Gong, Min-Seok Seo, Spyros Sypsas
We study next-to-leading corrections to the effective action of the curvature perturbation obtained by integrating out the coupled heavy isocurvature perturbation. These correction…
On degenerate models of cosmic inflation
Rhiannon Gwyn, Gonzalo A. Palma, Mairi Sakellariadou +1
In this article we discuss the role of current and future CMB measurements in pinning down the model of inflation responsible for the generation of primordial curvature perturbatio…
Superconformal Block Quivers, Duality Trees and Diophantine Equations
Amihay Hanany, Yang-Hui He, Chuang Sun +1
We generalize previous results on N=1, (3+1)-dimensional superconformal block quiver gauge theories. It is known that the necessary conditions for a theory to be superconformal, i.…
Effective field theory of weakly coupled inflationary models
Rhiannon Gwyn, Gonzalo A. Palma, Mairi Sakellariadou +1
The application of Effective Field Theory (EFT) methods to inflation has taken a central role in our current understanding of the very early universe. The EFT perspective has been…
Theoretical constraints on brane inflation and cosmic superstring radiation
Rhiannon Gwyn, Mairi Sakellariadou, Spyros Sypsas
We analyze theoretical constraints on the consistency of brane inflation leading to cosmic superstring formation and on the subsequent radiation of these cosmic superstrings. We fi…
Cosmic strings from pseudo-anomalous Fayet-Iliopoulos U(1) in D3/D7 brane inflation
Rhiannon Gwyn, Mairi Sakellariadou, Spyros Sypsas
We examine the consequences of recent developments on Fayet-Iliopoulos (FI) terms for D-term inflationary models. There is currently no known way to couple constant FI terms to sup…