Primordial gravitational waves in the nano-Hertz regime and PTA data — towards solving the GW inverse problem

Eric Madge*, Enrico Morgante, Cristina Puchades-Ibáñez, Nicklas Ramberg, Wolfram Ratzinger, Sebastian Schenk, Pedro Schwaller

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

In recent years, several pulsar timing array collaborations have reported first hints for a stochastic gravitational wave background at nano-Hertz frequencies. Here we elaborate on the possibility that this signal comes from new physics that leads to the generation of a primordial stochastic gravitational wave background. We propose a set of simple but concrete models that can serve as benchmarks for gravitational waves sourced by cosmological phase transitions, domain wall networks, cosmic strings, axion dynamics, or large scalar fluctuations. These models are then confronted with pulsar timing data and with cosmological constraints. With only a limited number of free parameters per model, we are able to identify viable regions of parameter space and also make predictions for future astrophysical and laboratory tests that can help with model identification and discrimination.

Original languageEnglish
Article number171
JournalJournal of High Energy Physics
Volume2023
Issue number10
DOIs
Publication statusPublished - Oct 2023

Funding

Publisher Copyright: © 2023, The Author(s).

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Fingerprint

Dive into the research topics of 'Primordial gravitational waves in the nano-Hertz regime and PTA data — towards solving the GW inverse problem'. Together they form a unique fingerprint.

Cite this