Strongly self-interacting vector dark matter via freeze-in

Duch, Mateusz; Grza̧dkowski, Bohdan; Huang, Da

doi:10.1007/jhep01(2018)020

Cited by 39 publications

(57 citation statements)

References 103 publications

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“…The VDM model is constrained by the direct detection experiments. The spin-independent XN scattering cross-section is given by [34] σ XN = sin 2 2α 4π…”

Section: Dark Matter Direct Detectionmentioning

confidence: 99%

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Testing scalar versus vector dark matter

et al. 2019

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We investigate and compare two simple models of dark matter (DM): a vector and a scalar DM model. Both models require the presence of two physical Higgs bosons h 1 and h 2 which come from mixed components of the standard Higgs doublet H and a complex singlet S. In the Vector model, the extra U (1) symmetry is spontaneously broken by the vacuum of the complex field S. This leads to a massive gauge boson X µ that is a DM candidate stabilized by the dark charge conjugation symmetry S → S * , X µ → −X µ . On the other hand, in the Scalar model the gauge group remains the standard one. The DM field A is the imaginary component of S and the stabilizing symmetry is also the dark charge conjugation S → S * (A → −A). In this case, in order to avoid spontaneous breaking, the U (1) symmetry is broken explicitly, but softly, in the scalar potential. The possibility to disentangle the two models has been investigated. We have analyzed collider, cosmological, DM direct and indirect detection constraints and shown that there are regions in the space spanned by the mass of the non-standard Higgs boson and the mass of the DM particle where the experimental bounds exclude one of the models. We have also considered possibility to disentangle the models at e + e − collider and concluded that the process e + e − → Z + DM provides a useful tool to distinguish the models.

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“…The VDM model is constrained by the direct detection experiments. The spin-independent XN scattering cross-section is given by [34] σ XN = sin 2 2α 4π…”

Section: Dark Matter Direct Detectionmentioning

confidence: 99%

“…When the VDM mass is smaller than half of the SM-like Higgs boson h 1 , m X < m 1 /2, the Higgs invisible decay provides another constraint on the VDM scenario. In the present model, the width for invisible decays is provided by the process h 1 → XX and can be expressed as follows [34]…”

Section: Higg-boson Invisable Decays: H 1 → XXmentioning

confidence: 99%

Testing scalar versus vector dark matter

et al. 2019

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“…This is one example of a general theme: once we depart from thermal equilibrium, the details of which processes go out of equilibrium first can lead to rich behavior even within a simple model, e.g. [24,[27][28][29][30][31][32][33][34][35][36]. To go further and work out the observational consequences for leak-in DM, we will need to be more concrete and specify a model.…”

Section: Region Of Interest For the Portal Couplingmentioning

confidence: 99%

Leak-in dark matter

2020

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We introduce leak-in dark matter, a novel out-of-equilibrium origin for the dark matter (DM) in the universe. We provide a comprehensive and unified discussion of a minimal, internallythermalized, hidden sector populated from an out-of-equilibrium, feeble connection to the hotter standard model (SM) sector. We emphasize that when this out-of-equilibrium interaction is renormalizable, the colder sector undergoes an extended phase of non-adiabatic evolution largely independent of initial conditions, which we dub "leak-in." We discuss the leak-in phase in generality, and establish the general properties of dark matter that freezes out from a radiation bath undergoing such a leak-in phase. As a concrete example, we consider a model where the SM has an out-of-equilibrium B − L vector portal interaction with a minimal hidden sector. We discuss the interplay between leak-in and freezein processes in this theory in detail and demonstrate regions where leak-in yields the full relic abundance. We study observational prospects for B −L vector portal leak-in DM, and find that despite the requisite small coupling to the SM, a variety of experiments can serve as sensitive probes of leak-in dark matter. Additionally, regions allowed by all current constraints yield DM with self-interactions large enough to address small-scale structure anomalies. ARXIV EPRINT: nnnn.nnnnn arXiv:1909.04671v1 [hep-ph]

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“…On the other hand, in the model with a scalar mediator, even though the DM indirect detection constraints can be avoided since the fermionic DM annihilation is p-wave dominated [54], the DM direct detection upper bounds [55] imply the longevity of the scalar mediator, which would modify the primordial abundances of light elements during Big-Bang nucleosynthesis (BBN) [56][57][58]. Though, there have already been many possible solutions proposed to avoid such tensions for models with scalar and vector mediators [54,[59][60][61][62][63][64][65][66][67][68][69].…”

Section: Introductionmentioning

confidence: 99%

Strong dark matter self-interaction from a stable scalar mediator

Duch

Grza̧dkowski

Huang

2020

J. High Energ. Phys.

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In face of the small-scale structure problems of the collisionless cold dark matter (DM) paradigm, a popular remedy is to introduce a strong DM self-interaction which can be generated nonperturbatively by a MeV-scale light mediator. However, if such the mediator is unstable and decays into SM particles, the model is severely constrained by the DM direct and indirect detection experiments. In the present paper, we study a model of a self-interacting fermionic DM, endowed with a light stable scalar mediator. In this model, the DM relic abundance is dominated by the fermionic DM particle which is generated mainly via the freeze-out of its annihilations to the stable mediator. Since this channel is invisible, the DM indirect detection constraints should be greatly relaxed. Furthermore, the direct detection signals are suppressed to an unobservable level since fermionic DM scatterings with a nucleon appear at one-loop level. By further studying the bounds from the CMB and BBN on the visible channels involving the dark sector, we show that there is a large parameter space which can generate appropriate DM self-interactions at dwarf galaxy scales, while remaining compatible with other experimental constraints.

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Strongly self-interacting vector dark matter via freeze-in

Cited by 39 publications

References 103 publications

Testing scalar versus vector dark matter

Testing scalar versus vector dark matter

Leak-in dark matter

Strong dark matter self-interaction from a stable scalar mediator

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