217 citations · 420 across the 16 of their papers we have counts for
14 papers · 1 filter
CMB Spectral Distortion Anisotropies from Acoustic Damping with primordial non-Gaussianity
Jens Chluba, Atsuhisa Ota, Nicola Bartolo
In this paper, we evaluate the precise distortion source and transfer functions caused by mixing of blackbodies of different temperatures using the recently developed frequency hie…
Constraining primordial non-Gaussianity and parity-violation through Scalar-Induced Gravitational Waves with next-generation ground-based interferometers
Ilaria Caporali, H. V. Ragavendra, Angelo Ricciardone +1
In this work, we investigate the prospects for probing primordial non-Gaussianity and associated symmetry of parity through scalar-induced gravitational waves (SIGWs), with third-g…
Gravitational-wave lensing beyond rays: a disordered-system approach
Ripalta Amoruso, Ginevra Braga, Alice Garoffolo +3
We develop a framework to describe gravitational wave propagation through a stochastic distribution of weak gravitational lenses beyond the geometric optics limit. We model the len…
Probing Cosmic Expansion and Early Universe with Einstein Telescope
Angelo Ricciardone, Mairi Sakellariadou, Archisman Ghosh +52
Over the next two decades, gravitational-wave (GW) observations are expected to evolve from a discovery-driven endeavour into a precision tool for astrophysics, cosmology, and fund…
Twisted echoes of an odd quartet: Scalar-induced gravitational waves as a probe of primordial parity-violation
H. V. Ragavendra, Nicola Bartolo
Parity-violation leaves tell-tale trails in many cosmological observables. We illustrate parity-odd primordial scalar trispectra, that despite being of modest strength, impart dete…
Inflationary Fossils Beyond Perturbation Theory
Riccardo Impavido, Nicola Bartolo
In this work we provide the missing link between two approaches aimed at characterizing the effect of long perturbation modes in Inflation. We consider the Inflationary Fossils' ap…
Revisiting the Chern-Simons interaction during inflation with a non-canonical pseudo-scalar
Jun'ya Kume, Marco Peloso, Nicola Bartolo
A Chern-Simons interaction between a pseudo-scalar field and a U(1) gauge field results in the generation of a chiral gravitational wave background. The detection of this signal is…
Non-linear effects on the Cosmological Gravitational Wave Background anisotropies
Alina Mierna, Sabino Matarrese, Nicola Bartolo +1
The Cosmological Gravitational Wave Background (CGWB) anisotropies contain valuable information about the physics of the early universe. Given that General Relativity is intrinsica…
Breaking parity: the case of the trispectrum from chiral scalar-tensor theories of gravity
Tommaso Moretti, Nicola Bartolo, Alessandro Greco
Recently, possible hints of parity violation have been observed in the connected galaxy four-point correlation function. Although the true origin of the signal from the analysis ha…
Proper time path integrals for gravitational waves: an improved wave optics framework
Ginevra Braga, Alice Garoffolo, Angelo Ricciardone +2
When gravitational waves travel from their source to an observer, they interact with matter structures along their path, causing distinct deformations in their waveforms. In this s…
CMB spectral distortions from enhanced primordial perturbations: the role of spectator axions
Margherita Putti, Nicola Bartolo, Sukannya Bhattacharya +1
Primordial tensor modes can induce Cosmic Microwave Background spectral distortions during horizon re-entry. We investigate a specific mechanism proposed for this purpose, characte…
Testing Primordial Black Holes as Dark Matter through LISA
N. Bartolo, V. De Luca, G. Franciolini +3
The idea that primordial black holes (PBHs) can comprise most of the dark matter of the universe has recently reacquired a lot of momentum. Observational constraints, however, rule…
Measuring chiral gravitational waves in Chern-Simons gravity with CMB bispectra
Nicola Bartolo, Giorgio Orlando, Maresuke Shiraishi
Chern-Simons gravity coupled to the scalar sector through a generic coupling function can be tested at the very high energies of the inflationary period. In 1706.04627, we c…
Isotropic non-Gaussian -like toy models that reproduce the cosmic microwave background anomalies
F. K. Hansen, T. Trombetti, N. Bartolo +4
Based on recent observations of the cosmic microwave background (CMB), claims of statistical anomalies in the properties of the CMB fluctuations have been made. Although the statis…