6 papers
Background-independent one-loop renormalization of tensor and scalar primordial spectra
Guillermo Ballesteros, Jesús GambÃn Egea, Flavio Riccardi
We present a background-independent renormalization framework for one-loop primordial spectra. We apply it to two observables: the scalar-induced tensor spectrum sourced by a minim…
Finite parts of inflationary loops II: A streamlined UV in-in algorithm and distinguishable signatures
Guillermo Ballesteros, Jesús GambÃn Egea, Flavio Riccardi
We introduce a streamlined method for evaluating in-in loop integrals using dimensional regularization for diagrams with an arbitrary number of external legs and vertices, which co…
Classical and quantum evolution of inflationary fluctuations
Guillermo Ballesteros, Jesús GambÃn Egea, Alejandro Pérez RodrÃguez
We compare the correlation functions of inflationary perturbations computed either with quantum or classical dynamics. Even if they are enforced to agree at a specific time during…
Intrinsic non-Gaussianity of ultra slow-roll inflation
Guillermo Ballesteros, Jesús GambÃn Egea, Thomas Konstandin +3
We study the non-Gaussian tail of the curvature fluctuation, , in an inflationary scenario with a transient ultra slow-roll phase that generates a localized large enhancement o…
Primordial black hole formation from self-resonant preheating?
Guillermo Ballesteros, Joaquim Iguaz Juan, Paquale D. Serpico +1
We revisit the question of how generic is the formation of primordial black holes via self-resonant growth of inflaton fluctuations in the post-inflationary, preheating phase. Usin…
Finite parts of inflationary loops
Guillermo Ballesteros, Jesús GambÃn Egea, Flavio Riccardi
We present a method for solving loop integrals in dimensional regularization that is particularly useful in the context of inflation. We apply this method to the calculation of the…