Mirror QCD phase transition as the origin of the nanohertz Stochastic Gravitational-Wave Background
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7 pages
Published in:
- Sci.Bull. 69 (2024) 741-746
- Published: Jan 30, 2024
e-Print:
- 2306.16769 [astro-ph.HE]
DOI:
- 10.1016/j.scib.2024.01.037 (publication)
View in:
Citations per year
Abstract: (Elsevier B.V.)
Several Pulsar Timing Array (PTA) Collaborations have recently provided strong evidence for a nHz Stochastic Gravitational-Wave Background (SGWB). Here we investigate the implications of a first-order phase transition occurring within the early Universe’s dark quantum chromodynamics epoch, specifically within the framework of the mirror twin Higgs dark sector model. Our analysis indicates a distinguishable SGWB signal originating from this phase transition, which can explain the measurements obtained by PTAs. Remarkably, a significant portion of the parameter space for the SGWB signal also effectively resolves the existing tensions in both the and measurements in Cosmology. This intriguing correlation suggests a possible common origin of these three phenomena for , where the mirror dark matter component constitutes less than of the total dark matter abundance. Next-generation CMB experiments such as CMB-S4 can test this parameter region.Note:
- 7 pages, 4 figures
- Mirror twin Higgs
- Dark matter
- Phase transition
- Gravitational wave
- Pulsar timing array
- gravitational radiation: background
- gravitational radiation: stochastic
- dark matter: mirror
- quantum chromodynamics: critical phenomena
- pulsar
References(62)
Figures(5)
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