Relic Abundance in a Secluded Dark Matter Scenario with a Massive Mediator

Abstract

The relic abundance of the dark matter (DM) particle $d$ is studied in a secluded DM scenario, in which the $d$ number decreasing process dominantly occurs not through the pair annihilation of $d$ into the standard model particles, but via the $dd\to mm$ scattering process with a subsequently decaying mediator particle $m$. It is pointed out that the cosmologically observed relic abundance of DM can be accomplished even with a massive mediator having a mass $m_m$ non-negligibly heavy compared with the DM particle mass $m_d$. In the degenerated $d$-$m$ case ($m_d=m_m$), the DM relic abundance is realized by adjusting the $dd\to mm$ scattering amplitude large enough and by choosing an appropriate mediator particle life-time. The DM evolution in the early universe exhibits characteristic "terrace" behavior, or two-step number density decreasing behavior, having a "fake" freeze-out at the first step. Based on these observations, a novel possibility of the DM model buildings is introduced in which the mediator particle $m$ is unified with the DM particle $d$ in an approximate dark symmetry multiplet. A pionic DM model is proposed to illustrate this idea in a renormalizable field theory framework.

arXiv comment17 pages, 13 figures, version accepted for publication in PRD

References in corpus (34)

• Planck 2015 results. XIII. Cosmological parameters
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Particle Dark Matter: Evidence, Candidates and Constraints
• A Theory of Dark Matter
• Results from a search for dark matter in the complete LUX exposure
• Dark Matter Candidates from Particle Physics and Methods of Detection
• Secluded WIMP Dark Matter
• Gauge Singlet Scalars as Cold Dark Matter
• The Minimal Model of Nonbaryonic Dark Matter: A Singlet Scalar
• The SIMP Miracle
• Dark Matter Results from First 98.7-day Data of PandaX-II Experiment
• Dark Matter Benchmark Models for Early LHC Run-2 Searches: Report of the ATLAS/CMS Dark Matter Forum
• Dark matter direct-detection experiments
• The SIMPlest Miracle
• Ultra Minimal Technicolor and its Dark Matter TIMP
• Results from the first use of low radioactivity argon in a dark matter search
• Scale invariant extension of the standard model with strongly interacting hidden sector
• SIMP Spectroscopy
• Composite Scalar Dark Matter
• Cannibal Dark Matter
• PeV-Scale Dark Matter as a Thermal Relic of a Decoupled Sector
• Electroweak and Conformal Symmetry Breaking by a Strongly Coupled Hidden Sector
• Asymmetric Twin Dark Matter
• Assisted freeze-out
• Co-Decaying Dark Matter
• Weakly Interacting Stable Pions
• Phases of Cannibal Dark Matter
• Improved WIMP-search reach of the CDMS II germanium data
• Thermal Dark Matter from a Confining Sector
• Gamma-rays from Dark Showers with Twin Higgs Models
• Right-handed sneutrino dark matter in $\mathbf{U}(1{)}^{\prime }$ seesaw models and its signatures at the LHC
• Pionic Dark Matter
• Nambu-Goldstone Dark Matter in a Scale Invariant Bright Hidden Sector
• AdS/QCD approach to the scale-invariant extension of the standard model with a strongly interacting hidden sector

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