Gravitational waves from domain wall collapses and dark matter in the SM with a complex scalar

2024/03/25 by H. Pham, Pham, Hieu The, Eibun Senaha +1
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #Geophysics and Gravity Measurements #High Energy Physics - Phenomenology (hep-ph) #Pulsars and Gravitational Waves Research

paper · pdf · doi:10.48550/arxiv.2403.16568

openalex publication_date 2024/03/25 · openalex created_date 2024/03/27 · openalex updated_date 2026/07/28

Abstract

We study domain wall induced by spontaneously broken ℤ₂ symmetry and its gravitational wave signature in the standard model with a complex scalar in connection with dark matter physics. In a minimal setup, a linear term of the singlet field is added to the scalar potential as an explicit ℤ₂ breaking term to make the domain wall unstable. We obtain its minimal size from cosmological constraints and show that the parameter space that can be probed by current and future pulsar time array experiments requires the vacuum expectation value of the singlet field to be greater than O(10-100) TeV, along with a singlet-like Higgs mass of O(1-100) TeV. However, such a region is severely restricted by the dark matter relic density, which places an upper bound on the singlet vacuum expectation value at approximately 200 TeV, and limits the dark matter mass to about half of the singlet-like Higgs boson mass.

Related

• Irreducible cosmological backgrounds of a real scalar with a broken symmetry
• The gravitational waves from the collapsing domain walls in the complex singlet model
• Gravitational waves from dark domain walls
• Probing the high temperature symmetry breaking with gravitational waves from domain walls
• Collapsing domain walls with ℤ₂-violating coupling to thermalized fermions and their impact on gravitational wave detections