4 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…
An ode to instantons
Oliver Janssen, Joel Karlsson, Flavio Riccardi +1
We present a formalism for semiclassical time evolution in quantum mechanics, building on a century of work. We identify complex saddle points in real time, real saddle points in c…
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…