Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2022/12/025
Keywords
cosmological phase transitions; dark matter theory; gravitational waves; sources; physics of the early universe
Funding
- Estonian Research Council [PRG434, PRG356]
- European Regional Development Fund
- programme Mobilitas Pluss [MOBTT5, MOBTT86]
- EU through the European Regional Development Fund CoE program [TK133]
- la Caixa Foundation [100010434]
- European Union [847648]
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The inert doublet model is an extension of the Standard Model that has implications for understanding dark matter and cosmic evolution through the study of cosmic phase transitions and gravitational wave signals.
The inert doublet model is a well-motivated extension of the Standard Model that contains a dark matter candidate and modifies the dynamics of the electroweak symmetry breaking. In order to detail its phenomenology, we perform a comprehensive study of cosmic phase transitions and gravitational wave signals implied by the framework, accounting for the latest results of collider experiments. We require the neutral inert scalar to constitute, at least, a subdominant part of the observed dark matter abundance. While most of the phase transitions proceed through a single step, we identify regions of the parameter space where the electroweak vacuum is reached after multiple phase transitions. The resulting gravitational wave spectrum is generally dominated by single-step transitions and, in part of the parameter space, falls within the reach of future gravitational wave detectors such as LISA, BBO or DECIGO. We find that direct detection experiments efficiently probe the part of parameter space associated with multi-step phase transitions, which remain unconstrained only in the Higgs resonance region testable with future monojet searches. The implications of the new determination of the W boson mass are also discussed.
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