Can the relic density of self-interacting dark matter be due to annihilations into Standard Model particles?

Chu, Xiaoyong; Garcia-Cely, Camilo; Hambye, Thomas

doi:10.1007/jhep11(2016)048

Cited by 20 publications

(17 citation statements)

References 134 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As we will show, the observational limits on DM selfinteractions do not only rule out part of the parameter space for the model we will consider in this paper, but taking the detailed effect of DM self-interactions into account is crucial for determination of the final DM abundance, reminiscent to the so-called Strongly Interacting Massive Particle (SIMP) or cannibal DM scenarios [40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63]. We will also discuss other prospects for detection of DM including collider, direct, and indirect detection experiments.…”

Section: Introductionmentioning

confidence: 99%

Phenomenology of self-interacting dark matter in a matter-dominated universe

2019

View full text Add to dashboard Cite

We study production of self-interacting dark matter (DM) during an early matter-dominated phase. As a benchmark scenario, we consider a model where the DM consists of singlet scalar particles coupled to the visible Standard Model (SM) sector via the Higgs portal. We consider scenarios where the initial DM abundance is set by either the usual thermal freeze-out or an alternative freeze-in mechanism, where DM was never in thermal equilibrium with the SM sector. For the first time, we take the effect of self-interactions within the hidden sector into account in determining the DM abundance, reminiscent to the Strongly Interacting Massive Particle (SIMP) scenario. In all cases, the number density of DM may change considerably compared to the standard radiation-dominated case, having important observational and experimental ramifications.

show abstract

Section: Introductionmentioning

confidence: 99%

Phenomenology of self-interacting dark matter in a matter-dominated universe

2019

View full text Add to dashboard Cite

show abstract

“…Another attractive feature of SIDM with a very light mediator is that the DM abundance today can be explained by thermal production in the early Universe. In contrast to the standard WIMP scenario [19], where DM annihilates directly into SM states (see [20]), the DM particle χ annihilates into the mediator particles φ, which subsequently decay into SM states: χχ → φφ → SM [21]. This can naturally yield the observed relic abundance even if interactions with the SM are strongly suppressed.…”

mentioning

confidence: 96%

Strong Constraints on Self-Interacting Dark Matter with Light Mediators

et al. 2017

View full text Add to dashboard Cite

Coupling dark matter to light new particles is an attractive way to combine thermal production with strong velocity-dependent self-interactions. Here we point out that in such models the dark matter annihilation rate is generically enhanced by the Sommerfeld effect, and we derive the resulting constraints from the cosmic microwave background and other indirect detection probes. For the frequently studied case of s-wave annihilation, these constraints exclude the entire parameter space where the self-interactions are large enough to address the small-scale problems of structure formation.

show abstract

“…Notice that due to the feeble coupling involved, direct and indirect detection dark matter searches are challenging, see however e.g. [1,[23][24][25][26][27][28][29]. Unconventional signatures at the LHC can hence provide the main experimental probes for the class of model studied here.The rest of the paper is organized as follows.…”

mentioning

confidence: 97%

A feeble window on leptophilic dark matter

Junius

Lopez-Honorez

Mariotti

2019

J. High Energ. Phys.

View full text Add to dashboard Cite

In this paper we study a leptophilic dark matter scenario involving feeble dark matter coupling to the Standard Model (SM) and compressed dark matter-mediator mass spectrum. We consider a simplified model where the SM is extended with one Majorana fermion, the dark matter, and one charged scalar, the mediator, coupling to the SM leptons through a Yukawa interaction. We first discuss the dependence of the dark matter relic abundance on the Yukawa coupling going continuously from freeze-in to freeze-out with an intermediate stage of conversion driven freeze-out. Focusing on the latter, we then exploit the macroscopic decay length of the charged scalar to study the resulting long-lived-particle signatures at collider and to explore the experimental reach on the viable portion of the parameter space. e.g. [1][2][3][4]. In some parts of this parameter space, the DM happens to be very feebly coupled to the SM, i.e. with couplings much more suppressed than for the WIMP case.We focus on this feeble interaction window for scenarios involving a small mass splitting between the dark matter and the mediator connecting DM to the SM. We will study in details the mechanism of dark matter production in the early universe, from freezein to freeze-out. In particular, we will mainly focus on the intermediate stage of DM coannihilation freeze-out happening out of chemical equilibrium (CE) with the SM plasma, also called conversion driven freeze-out. Such a scenario has already been pointed out in [3] and mainly studied for dark matter coupling to quarks [3,5,6]. Here instead we focus on the case of a leptophilic dark matter model. Conversion processes between the mediator and the dark matter will play a central role in defining the evolution of the DM abundance and they will have to be taken into account in the study of the DM/mediator Boltzmann equations. In passing, we will also emphasize the fact that, within the freeze-in framework, mediator scatterings (as opposed to decay) can play a leading role in determining the DM relic density. Finally, we will identify the viable parameter space for conversion driven freeze-out so as to further study the experimental constraints on this class of models.The feeble coupling of the DM to the mediator allows for a macroscopic decay length of the mediator that can be observed at colliders through e.g. charged and/or disappearing tracks. These are typical features of DM scenarios in which the DM abundance results from the freeze-in [4] and conversion driven freeze-out [3]. These production mechanisms can lead to distinctive and challenging signatures at colliders, including long lived charged particles and very soft signatures. In the freeze-in case, the DM coupling is so suppressed that the mediator mainly decays outside the detector giving rise to charged tracks. For conversion driven freeze-out, the slightly larger couplings involved can also give rise to disappearing tracks. The LHC community has already provided a strong effort in the study of final state signatures which arise from DM mo...

show abstract

Can the relic density of self-interacting dark matter be due to annihilations into Standard Model particles?

Cited by 20 publications

References 134 publications

Phenomenology of self-interacting dark matter in a matter-dominated universe

Phenomenology of self-interacting dark matter in a matter-dominated universe

Strong Constraints on Self-Interacting Dark Matter with Light Mediators

A feeble window on leptophilic dark matter

Contact Info

Product

Resources

About