Dark matter from CP symmetry of order 4: evolution in the asymmetric regime

Abstract

Multi-Higgs models equipped with global symmetries produce scalar dark matter (DM) candidates stabilized by the unbroken symmetry. It is remarkable that a conserved CP symmetry can also stabilize DM candidates, provided it is a CP symmetry of order higher than two. CP4 3HDM, the three-Higgs-doublet model with CP symmetry of order 4, is the simplest example of this kind. It contains two mass-degenerate scalar DM candidates $\phi$ and $\bar{\phi }$, each of them being a CP4 eigenstate and, therefore, its own antiparticle. A novel phenomenological feature of this model is the presence of $\phi \phi \leftrightarrow \bar{\phi }\bar{\phi }$ conversion process, which conserves CP. It offers a rare example of DM models in which self-interaction in the dark sector can significantly affect cosmological and astrophysical observables. Here, we explore the thermal evolution of these DM species in the asymmetric regime. We assume that a mechanism external to CP4 3HDM produces an initial imbalance of the densities of $\phi$ and $\bar{\phi }$. As the Universe cools down, we track the evolution of the asymmetry through different stages, and determine how the final asymmetry depends on the interplay between the conversion and annihilation $\phi \bar{\phi }\to$ SM and on the initial conditions. We begin with the analytic treatment of Boltzmann equations, present a detailed qualitative description of the process, and then corroborate it with numerical results obtained using a dedicated computer code. Finally, we check if the model can produce an observable indirect detection signal.

arXiv comment17 pages, 4 figures

References in corpus (42)

• Planck 2015 results. XIII. Cosmological parameters
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Particle Dark Matter: Evidence, Candidates and Constraints
• Results from a search for dark matter in the complete LUX exposure
• Improved Naturalness with a Heavy Higgs: An Alternative Road to LHC Physics
• First Dark Matter Search Results from the XENON1T Experiment
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• The Inert Doublet Model: an Archetype for Dark Matter
• Asymmetric Dark Matter: Theories, Signatures, and Constraints
• Review of asymmetric dark matter
• micrOMEGAs4.1: two dark matter candidates
• The Fermi Galactic Center GeV Excess and Implications for Dark Matter
• Observing the Dark Scalar Doublet and its Impact on the Standard-Model Higgs Boson at Colliders
• Scalar Multiplet Dark Matter
• Anatomy of the Inert Two Higgs Doublet Model in the light of the LHC and non-LHC Dark Matter Searches
• Asymmetric WIMP dark matter
• DarkSUSY 6 : An Advanced Tool to Compute Dark Matter Properties Numerically
• Building and testing models with extended Higgs sectors
• MadDM v.3.0: a Comprehensive Tool for Dark Matter Studies
• Inert Doublet Model in light of LHC Run I and astrophysical data
• Inert Doublet Model in the light of LHC and astrophysical data
• Classification of finite reparametrization symmetry groups in the three-Higgs-doublet model
• Relic Abundance of Asymmetric Dark Matter
• Oscillating Asymmetric Dark Matter
• Consequences of DM/antiDM Oscillations for Asymmetric WIMP Dark Matter
• Constraining Extended Scalar Sectors at the LHC and beyond
• Regenerating a Symmetry in Asymmetric Dark Matter
• Discrete symmetries in the three-Higgs-doublet model
• Multi-Component Dark Matter: the vector and fermion case
• Advancing LHC Probes of Dark Matter from the Inert 2-Higgs Doublet Model with the Mono-jet Signal
• A CP-conserving multi-Higgs model without real basis
• Multi-Higgs doublet models: physical parametrization, sum rules and unitarity bounds
• Benchmarking the Inert Doublet Model for e+ e- colliders
• Dark Matter with Two Inert Doublets plus One Higgs Doublet
• Relativistic $<\sigma v_{\text{rel}}>$ in the calculation of relics abundances: a closer look
• Probability distribution for the relative velocity of colliding particles in a relativistic classical gas
• CP violating scalar Dark Matter
• CP4 miracle: shaping Yukawa sector with CP symmetry of order four
• Symmetries and Mass Degeneracies in the Scalar Sector
• Effects of Two Inert Scalar Doublets on Higgs Interactions and Electroweak Phase Transition
• When the C in CP does not matter: anatomy of order-4 CP eigenstates and their Yukawa interactions
• Dark matter data and quartic self-couplings in Inert Doublet Model

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