Scalar induced gravitational waves review

G Domènech - Universe, 2021‏ - mdpi.com
We provide a review on the state-of-the-art of gravitational waves induced by primordial
fluctuations, so-called induced gravitational waves. We present the intuitive physics behind …

Probing primordial black hole scenarios with terrestrial gravitational wave detectors

G Domènech, M Sasaki - Classical and Quantum Gravity, 2024‏ - iopscience.iop.org
It is possible that primordial black holes (PBHs) constitute (or constituted) a significant
fraction of the energy budget of our Universe. Terrestrial gravitational wave detectors offer …

The NANOGrav 15 yr data set: Search for signals from new physics

A Afzal, G Agazie, A Anumarlapudi… - The Astrophysical …, 2023‏ - iopscience.iop.org
The 15 yr pulsar timing data set collected by the North American Nanohertz Observatory for
Gravitational Waves (NANOGrav) shows positive evidence for the presence of a low …

Recent gravitational wave observation by pulsar timing arrays and primordial black holes: the importance of non-gaussianities

G Franciolini, AJ Iovino, V Vaskonen, H Veermäe - Physical Review Letters, 2023‏ - APS
We study whether the signal seen by pulsar timing arrays (PTAs) may originate from
gravitational waves (GWs) induced by large primordial perturbations. Such perturbations …

[HTML][HTML] Inflationary interpretation of the stochastic gravitational wave background signal detected by pulsar timing array experiments

S Vagnozzi - Journal of High Energy Astrophysics, 2023‏ - Elsevier
Various pulsar timing array (PTA) experiments (NANOGrav, EPTA, PPTA, CPTA, including
data from InPTA) very recently reported evidence for excess red common-spectrum signals …

Scalar-induced gravitational wave interpretation of PTA data: the role of scalar fluctuation propagation speed

S Balaji, G Domènech… - Journal of Cosmology and …, 2023‏ - iopscience.iop.org
Pulsar timing arrays gathered evidence of the presence of a gravitational wave background
around nHz frequencies. If the gravitational wave background was induced by large and …

Footprints of the QCD crossover on cosmological gravitational waves at pulsar timing arrays

G Franciolini, D Racco, F Rompineve - Physical Review Letters, 2024‏ - APS
Pulsar timing arrays (PTAs) have reported evidence for a stochastic gravitational wave (GW)
background at nanohertz frequencies, possibly originating in the early Universe. We show …

From inflation to black hole mergers and back again: Gravitational-wave data-driven constraints on inflationary scenarios with a first-principle model of primordial black …

G Franciolini, I Musco, P Pani, A Urbano - Physical Review D, 2022‏ - APS
Recent population studies have searched for a subpopulation of primordial black holes
(PBHs) in the gravitational-wave (GW) events so far detected by LIGO/Virgo/KAGRA (LVK) …

Primordial non-Gaussianity up to all orders: Theoretical aspects and implications for primordial black hole models

G Ferrante, G Franciolini, AJ Iovino, A Urbano - Physical Review D, 2023‏ - APS
We develop an exact formalism for the computation of the abundance of primordial black
holes (PBHs) in the presence of local non-Gaussianity (NG) in the curvature perturbation …

Primordial gravitational waves from NANOGrav: A broken power-law approach

M Benetti, LL Graef, S Vagnozzi - Physical Review D, 2022‏ - APS
We revisit the possibility that the stochastic common-spectrum process recently detected by
the NANOGrav pulsar timing array experiment could be due to primordial gravitational …