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

Bernal, Nicolás; Cosme, Catarina; Tenkanen, Tommi

doi:10.1140/epjc/s10052-019-6608-8

Cited by 78 publications

(72 citation statements)

References 233 publications

(268 reference statements)

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“…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.…”

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confidence: 97%

A feeble window on leptophilic dark matter

Junius

Lopez-Honorez

Mariotti

2019

J. High Energ. Phys.

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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...

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confidence: 97%

A feeble window on leptophilic dark matter

Junius

Lopez-Honorez

Mariotti

2019

J. High Energ. Phys.

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“…It also keeps the model minimal. Equation (36) plays an important role to track the temperature of the SM plasma through the entropy density s…”

Section: Early Matter Dominated Universementioning

confidence: 99%

TeV scale leptogenesis with dark matter in non-standard cosmology

Mahanta

Borah

2020

J. Cosmol. Astropart. Phys.

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We study the consequence of a non-standard cosmological epoch in the early universe on the generation of baryon asymmetry through leptogenesis as well as dark matter abundance. We consider two different non-standard epochs: one where a scalar field behaving like pressure-less matter dominates the early universe, known as early matter domination (EMD) scenario while in the second scenario, the energy density of the universe is dominated by a component whose energy density red-shifts faster than radiation, known as fast expanding universe (FEU) scenario. While a radiation dominated universe is reproduced by the big bang nucleosynthesis (BBN) epoch in both the scenario, the high scale phenomena like generation of baryon asymmetry and dark matter relic get significantly affected. Adopting a minimal particle physics framework known as the scotogenic model which generates light neutrino masses at one-loop level, we find that in two specific realisations of EMD scenario, the scale of leptogenesis can be lower than that in a standard cosmological scenario. The other non-standard cosmological scenarios, on the other hand, can be constrained from the requirement of successful low scale leptogenesis and generating correct dark matter abundance simultaneously. Such a low scale scenario not only gives a unified picture of baryon asymmetry, dark matter and origin of neutrino mass but also opens up interesting possibilities for experimental detection.

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“…Simple DM models with a Higgs portal type interaction are still viable and enjoy a rich interest in the particle physics community [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60]. In our study, we focus on a singlet fermion DM model which was first introduced in Ref.…”

Section: Contentsmentioning

confidence: 99%

Gravitational waves and electroweak baryogenesis in a global study of the extended scalar singlet model

Beniwal

Lewicki

White

et al. 2019

J. High Energ. Phys.

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We perform a global fit of the extended scalar singlet model with a fermionic dark matter (DM) candidate. Using the most up-to-date results from the Planck measured DM relic density, direct detection limits from the XENON1T (2018) experiment, electroweak precision observables and Higgs searches at colliders, we constrain the 7dimensional model parameter space. We also find regions in the model parameter space where a successful electroweak baryogenesis (EWBG) can be viable. This allows us to compute the gravitational wave (GW) signals arising from the phase transition, and discuss the potential discovery prospects of the model at current and future GW experiments. Our global fit places a strong upper and lower limit on the second scalar mass, the fermion DM mass and the scalar-fermion DM coupling. In agreement with previous studies, we find that our model can simultaneously yield a strong first-order phase transition and saturate the observed DM abundance. More importantly, the GW spectra of viable points can often be within reach of future GW experiments such as LISA, DECIGO and BBO.

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

Cited by 78 publications

References 233 publications

A feeble window on leptophilic dark matter

A feeble window on leptophilic dark matter

TeV scale leptogenesis with dark matter in non-standard cosmology

Gravitational waves and electroweak baryogenesis in a global study of the extended scalar singlet model

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