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

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

  • Shyam Balaji
  • Guillem Domènech
  • Gabriele Franciolini

Organisationseinheiten

Externe Organisationen

  • Sapienza Università di Roma
  • CNRS Institut national de physique nucléaire et de physique des particules (IN2P3)
  • Sorbonne Université
  • Istituto Nazionale di Fisica Nucleare (INFN)
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Aufsatznummer041
Seitenumfang27
FachzeitschriftJournal of Cosmology and Astroparticle Physics
Jahrgang2023
Ausgabenummer10
PublikationsstatusVeröffentlicht - 12 Okt. 2023

Abstract

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 Gaussian primordial fluctuations, they would then produce too many sub-solar mass primordial black holes. We show that if at the time of gravitational wave generation the universe was dominated by a canonical scalar field, with the same equation of state as standard radiation but a higher propagation speed of fluctuations, one can explain the gravitational wave background with a primordial black hole counterpart consistent with observations. Lastly, we discuss possible ways to test this model with future gravitational wave detectors.

ASJC Scopus Sachgebiete

Zitieren

Scalar-induced gravitational wave interpretation of PTA data: the role of scalar fluctuation propagation speed. / Balaji, Shyam; Domènech, Guillem; Franciolini, Gabriele.
in: Journal of Cosmology and Astroparticle Physics, Jahrgang 2023, Nr. 10, 041, 12.10.2023.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Balaji S, Domènech G, Franciolini G. Scalar-induced gravitational wave interpretation of PTA data: the role of scalar fluctuation propagation speed. Journal of Cosmology and Astroparticle Physics. 2023 Okt 12;2023(10):041. doi: 10.48550/arXiv.2307.08552, 10.1088/1475-7516/2023/10/041
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