359 citations · 1.1k across the 20 of their papers we have counts for
21 papers
Reconstructing Primordial Curvature Perturbations via Scalar-Induced Gravitational Waves with LISA
Jonas El Gammal, Aya Ghaleb, Gabriele Franciolini +17
Many early universe scenarios predict an enhancement of scalar perturbations at scales currently unconstrained by cosmological probes. These perturbations source gravitational wave…
Gravitational waves from inflation in LISA: reconstruction pipeline and physics interpretation
Matteo Braglia, Gianluca Calcagni, Gabriele Franciolini +8
Various scenarios of cosmic inflation enhance the amplitude of the stochastic gravitational wave background (SGWB) at frequencies detectable by the LISA detector. We develop tools…
One-loop infrared rescattering by enhanced scalar fluctuations during inflation
Jacopo Fumagalli, Sukannya Bhattacharya, Marco Peloso +2
We show that, whenever the perturbations of some field are excited during inflation by a physical process on sub-horizon scales, they unavoidably generate, even through gravitation…
Absence of one-loop effects on large scales from small scales in non-slow-roll dynamics
Jacopo Fumagalli
We question the existence of one-loop corrections to the large-scale power spectrum from small-scale modes in non-slow-roll dynamics which are not volume suppressed by the ratio of…
Snowmass Theory Frontier: Astrophysics and Cosmology
Daniel Green, Joshua T. Ruderman, Benjamin R. Safdi +84
We summarize progress made in theoretical astrophysics and cosmology over the past decade and areas of interest for the coming decade. This Report is prepared as the TF09 "Astrophy…
Cosmology with the Laser Interferometer Space Antenna
Pierre Auclair, David Bacon, Tessa Baker +177
The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate of the universe, and to understand stochastic gravita…
Inflation: Theory and Observations
Ana Achúcarro, Matteo Biagetti, Matteo Braglia +19
Cosmic inflation provides a window to the highest energy densities accessible in nature, far beyond those achievable in any realistic terrestrial experiment. Theoretical insights i…
Detecting primordial features with LISA
Jacopo Fumagalli, Mauro Pieroni, Sébastien Renaux-Petel +1
Oscillations in the frequency profile of the stochastic gravitational wave background are a characteristic prediction of small-scale features during inflation. In this paper we pre…
Primordial gravitational waves from excited states
Jacopo Fumagalli, Gonzalo A. Palma, Sébastien Renaux-Petel +3
We show that a scalar excited state with large occupation numbers during inflation leads to an enhancement of tensor modes and a characteristic pattern of order-one oscillations in…
Expansion history-dependent oscillations in the scalar-induced gravitational wave background
Lukas T. Witkowski, Guillem Domènech, Jacopo Fumagalli +1
Oscillations in the frequency profile of the scalar-induced contribution to the stochastic gravitational wave background are a characteristic signal for small-scale features during…
Resonant features in the stochastic gravitational wave background
Jacopo Fumagalli, Sébastien Renaux-Petel, Lukas T. Witkowski
We analyse the post-inflationary contribution to the stochastic gravitational wave background due to a resonant feature in the scalar power spectrum, which is characterised by an o…
Oscillations in the stochastic gravitational wave background from sharp features and particle production during inflation
Jacopo Fumagalli, Sébastien Renaux-Petel, Lukas T. Witkowski
We identify a characteristic pattern in the scalar-induced stochastic gravitational wave background from particle production during inflation. If particle production is sufficientl…
Matching and running sensitivity in non-renormalizable inflationary models
Jacopo Fumagalli, Marieke Postma, Melvin van den Bout
Most of the inflationary models that are in agreement with the Planck data rely on the presence of non-renormalizable operators. If the connection to low energy particle physics is…
Turning in the landscape: a new mechanism for generating Primordial Black Holes
Jacopo Fumagalli, Sébastien Renaux-Petel, John W. Ronayne +1
We propose a new model-independent mechanism for producing primordial black holes from a period of multi-field inflation. This requires an enhancement of primordial fluctuations at…
Higgs vacuum (in)stability during inflation: the dangerous relevance of de Sitter departure and Planck-suppressed operators
Jacopo Fumagalli, Sébastien Renaux-Petel, John W. Ronayne
The measured Standard Model parameters lie in a range such that the Higgs potential, once extrapolated up to high scales, develops a minimum of negative energy density. This has im…
Hyper non-Gaussianities in inflation with strongly non-geodesic motion
Jacopo Fumagalli, Sebastian Garcia-Saenz, Lucas Pinol +2
Several recent proposals to embed inflation into high-energy physics rely on inflationary dynamics characterized by a strongly non-geodesic motion in negatively curved field space.…
Unitarity and predictiveness in new Higgs inflation
Jacopo Fumagalli, Sander Mooij, Marieke Postma
In new Higgs inflation the Higgs kinetic terms are non-minimally coupled to the Einstein tensor, allowing the Higgs field to play the role of the inflaton. The new interaction is n…
Renormalization Group independence of Cosmological Attractors
Jacopo Fumagalli
The large class of inflationary models known as - and -attractors gives identical cosmological predictions at tree level (at leading order in inverse power of the number of e…
Disformal transformations as a change of units
Jacopo Fumagalli, Sander Mooij, Marieke Postma
A disformal transformation is a very useful tool to analyze a general effective theory description of inflation. It can for example be used to set the tensor sound speed to unity,…
UV (in)sensitivity of Higgs inflation
Jacopo Fumagalli, Marieke Postma
The predictions of Standard Model Higgs inflation are in excellent agreement with the Planck data, without the need for new fields. However, consistency of the theory requires the…
Non-local formulation of ghost-free bigravity theory
Giulia Cusin, Jacopo Fumagalli, Michele Maggiore
We study the ghost-free bimetric theory of Hassan and Rosen, with parameters such that a flat Minkowski solution exists for both metrics. We show that, expanding around this…