6 papers
AI--Assisted Exploration: DHOST Theories without Quantum Ghosts
Ginevra Braga, Raul Jimenez, Sabino Matarrese
We ask whether a local symmetry can organize both classical degeneracy and perturbative stability in DHOST theories. An AI-assisted search finds a candidate in a constant-disformal…
A Bell experiment during inflation: probing quantum entanglement in tensor fluctuations through correlations of primordial scalar curvature perturbations
Pablo Tejerina-Pérez, Leonid Sarieddine, Daniele Bertacca +1
We propose a method that provides an observational signature of the quantum origin of primordial fluctuations generated during inflation. The method gives a prescription for testin…
A Bell Experiment in an Entangled Universe
Pablo Tejerina-Pérez, Daniele Bertacca, Raul Jimenez +1
We propose a possible quantum signature of the early Universe that could lead to observational imprints of the quantum nature of the inflationary period. Graviton production from t…
Inflation without an Inflaton III: non-Gaussian signatures
Mariam Abdelaziz, Marisol Traforetti, Daniele Bertacca +3
We investigate primordial non-Gaussianity in the Inflation without an Inflaton (IWI) framework, where scalar perturbations are generated at second order by primordial gravitational…
Inflation without an Inflaton II: observational predictions
Marisol Traforetti, Mariam Abdelaziz, Daniele Bertacca +3
We present a complete computation of the scalar power spectrum in the \emph{inflation without inflaton} (IWI) framework, where the inflationary expansion is driven solely by a de~S…
Inflation without an Inflaton
Daniele Bertacca, Raul Jimenez, Sabino Matarrese +1
We propose a novel scenario in which scalar perturbations, that seed the large scale structure of the Universe, are generated without relying on a scalar field (the inflaton). In t…