We study whether the signal seen by pulsar timing arrays (PTAs) may originate from gravitational waves (GWs) induced by large primordial perturbations. Such perturbations may be accompanied by a sizable primordial black hole (PBH) abundance. We improve existing analyses and show that PBH overproduction disfavors Gaussian scenarios for scalar-induced GWs at 2 sigmas and single-field inflationary scenarios, accounting for non-Gaussianity, at 3 sigmas as the explanation of the most constraining NANOGrav 15-year data. This tension can be relaxed in models where non-Gaussianities suppress the PBH abundance. On the flip side, the PTA data does not constrain the abundance of PBHs.
The recent gravitational wave observation by pulsar timing arrays and primordial black holes: the importance of non-Gaussianities / Franciolini, Gabriele; Iovino, Antonio Junior; Vaskonen, Ville; Veermae, Hardi. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 131:20(2023), pp. 1-15. [10.1103/PhysRevLett.131.201401]
The recent gravitational wave observation by pulsar timing arrays and primordial black holes: the importance of non-Gaussianities
Franciolini, Gabriele
;Iovino, Antonio Junior
;
2023
Abstract
We study whether the signal seen by pulsar timing arrays (PTAs) may originate from gravitational waves (GWs) induced by large primordial perturbations. Such perturbations may be accompanied by a sizable primordial black hole (PBH) abundance. We improve existing analyses and show that PBH overproduction disfavors Gaussian scenarios for scalar-induced GWs at 2 sigmas and single-field inflationary scenarios, accounting for non-Gaussianity, at 3 sigmas as the explanation of the most constraining NANOGrav 15-year data. This tension can be relaxed in models where non-Gaussianities suppress the PBH abundance. On the flip side, the PTA data does not constrain the abundance of PBHs.File | Dimensione | Formato | |
---|---|---|---|
Franciolini_The-recent-gravitational_2023.pdf
accesso aperto
Note: Articolo su rivista
Tipologia:
Documento in Post-print (versione successiva alla peer review e accettata per la pubblicazione)
Licenza:
Tutti i diritti riservati (All rights reserved)
Dimensione
4.59 MB
Formato
Adobe PDF
|
4.59 MB | Adobe PDF |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.