Constraints on scalar-induced gravitational waves up to third order from a joint analysis of BBN, CMB, and PTA data
Jul 6, 2023
10 pages
Published in:
- Phys.Rev.Res. 6 (2024) 1, 013207
- Published: Feb 26, 2024
e-Print:
- 2307.03095 [astro-ph.CO]
DOI:
- 10.1103/PhysRevResearch.6.013207 (publication)
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Citations per year
Abstract: (APS)
Recently, strong evidence for a gravitational-wave background has been reported by collaborations of pulsar timing arrays (PTAs). In the framework of scalar-induced gravitational waves, we concurrently investigate the second- and third-order gravitational waves by jointly analyzing PTA data alongside big-bang nucleosynthesis and cosmic microwave background datasets. We determine the primordial curvature spectral amplitude as and the spectral peak frequency as at a 95% confidence interval, pointing towards a mass range for primordial black holes of . Our findings suggest that third-order gravitational waves contribute more significantly to the integrated energy density than the second-order ones when . Furthermore, we expect future PTA projects to validate these findings and provide robust means to investigate the genesis and evolution of the universe, especially inflation.Note:
- 10 pages, 2 columns, 3 figures. Version accepted by Physical Review Research
- nucleosynthesis: big bang
- curvature: primordial
- gravitational radiation: background
- black hole: primordial
- energy: density
- cosmic background radiation
- spectral
- pulsar
- inflation
- gravitational radiation: induced
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