MULTI-SINGLET AND SINGLET-TRIPLET SCALAR DARK MATTER

2011 ◽  
Vol 26 (27) ◽  
pp. 2039-2049 ◽  
Author(s):  
OLIVER FISCHER ◽  
J. J. VAN DER BIJ
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Mass Range ◽  
Direct Search ◽  
Dark Matter Candidate ◽  
Real Scalar ◽  
Two Component ◽  
Matter Model ◽  
Dark Matter Model ◽  
Scalar Singlet

We take the stealth model,1 an inert [Formula: see text] multiplet of real scalar singlets, as a candidate for dark matter. We limit the parameter space on the basis of dark matter abundance and direct search experiments. Further we study briefly a real scalar triplet as dark matter candidate. Then a two-component dark matter model is considered, which consists of a real scalar singlet and a scalar triplet with a Z2×Z2 symmetry. In a narrow mass range, the direct search experiments start to give some limitations.

A two-component dark matter model with real singlet scalars confronting GeV γ-ray excess from galactic centre and Fermi bubble

Pramana ◽  
2016 ◽  
Vol 86 (2) ◽  
pp. 343-351 ◽  
Author(s):  
DEBASISH MAJUMDAR ◽  
KAMAKSHYA PRASAD MODAK ◽  
SUBHENDU RAKSHIT
Keyword(s):  
Dark Matter ◽  
Galactic Centre ◽  
Two Component ◽  
Matter Model ◽  
Γ Ray ◽  
Dark Matter Model

scholarly journals Two component WIMP–FImP dark matter model with singlet fermion, scalar and pseudo scalar

2017 ◽  
Vol 77 (10) ◽  
Author(s):  
Amit Dutta Banik ◽  
Madhurima Pandey ◽  
Debasish Majumdar ◽  
Anirban Biswas
Keyword(s):  
Dark Matter ◽  
Two Component ◽  
Matter Model ◽  
Pseudo Scalar ◽  
Dark Matter Model

scholarly journals Dark matter from a complex scalar singlet: the role of dark CP and other discrete symmetries

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Leonardo Coito ◽  
Carlos Faubel ◽  
Juan Herrero-García ◽  
Arcadi Santamaria
Keyword(s):  
Dark Matter ◽  
Symmetry Breaking ◽  
Parameter Space ◽  
Dark Matter Candidate ◽  
Theory Approach ◽  
Complex Scalar ◽  
Symmetry Breaking Term ◽  
Pseudo Scalar ◽  
Breaking Term ◽  
Scalar Singlet

Abstract We study the case of a pseudo-scalar dark matter candidate which emerges from a complex scalar singlet, charged under a global U(1) symmetry, which is broken both explicitly and spontaneously. The pseudo-scalar is naturally stabilized by the presence of a remnant discrete symmetry: dark CP. We study and compare the phenomenology of several simplified models with only one explicit symmetry breaking term. We find that several regions of the parameter space are able to reproduce the observed dark matter abundance while respecting direct detection and invisible Higgs decay limits: in the resonances of the two scalars, featuring the known as forbidden or secluded dark matter, and through non-resonant Higgs-mediated annihilations. In some cases, combining different measurements would allow one to distinguish the breaking pattern of the symmetry. Moreover, this setup admits a light DM candidate at the sub-GeV scale. We also discuss the situation where more than one symmetry breaking term is present. In that case, the dark CP symmetry may be spontaneously broken, thus spoiling the stability of the dark matter candidate. Requiring that this does not happen imposes a constraint on the allowed parameter space. Finally, we consider an effective field theory approach valid in the pseudo-Nambu-Goldstone boson limit and when the U(1) breaking scale is much larger than the electroweak scale.

scholarly journals Fermion singlet dark matter in a pseudoscalar dark matter portal

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Bastián Díaz Sáez ◽  
Patricio Escalona ◽  
Sebastián Norero ◽  
Alfonso Zerwekh
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Indirect Detection ◽  
Dirac Fermion ◽  
Simple Extension ◽  
Higgs Decay ◽  
The Standard Model ◽  
Matter Model ◽  
Relic Abundance ◽  
Dark Matter Model

Abstract We explore a simple extension to the Standard Model containing two gauge singlets: a Dirac fermion and a real pseudoscalar. In some regions of the parameter space both singlets are stable without the necessity of additional symmetries, then becoming a possible two-component dark matter model. We study the relic abundance production via freeze-out, with the latter determined by annihilations, conversions and semi-annihilations. Experimental constraints from invisible Higgs decay, dark matter relic abundance and direct/indirect detection are studied. We found three viable regions of the parameter space, and the model is sensitive to indirect searches.

scholarly journals Dark Matter Constraints and the Neutralino Sector of the scNMSSM

Universe ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 31
Author(s):  
Elham Aldufeery ◽  
Maien Binjonaid
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Cross Sections ◽  
Direct Detection ◽  
Mass Range ◽  
Upper And Lower Bounds ◽  
Dark Matter Candidate ◽  
Dark Matter Relic Density ◽  
Relic Density ◽  
Moderate Range

The neutralino sector of the semi-constrained next-to-minimal supersymmetric standard model is explored under recent experimental constraints, with special attention to dark matter (DM) limits. The effects of the upper and lower bounds of dark matter relic density and recent direct detection constraints on spin-independent and -dependent cross-sections are thoroughly analyzed. Particularly, we show which regions of the parameter space are ruled out due to the different dark matter constraints and the corresponding model-specific parameters: λ,κ,Aλ, and Aκ. We analyze all annihilation and co-annihilation processes (with heavier neutralinos and charginos) that contribute to the dark matter relic density. The mass components of the dark matter candidate, the lightest neutralino χ˜10, are studied, and the decays of heavy neutralinos and charginos, especially χ˜20 and χ˜1+, into the lightest neutralino are examined. We impose semi-universal boundary conditions at the Grand Unified Theory scale, and require a moderate range of tanβ≲10. We find that the allowed parameter space is associated with a heavy mass spectrum in general and that the lightest neutralino is mostly Higgsino with a mass range that resides mostly between 1000 and 1500 GeV. However, smaller mass values can be achieved if the DM candidate is bino-like or singlino-like.

scholarly journals An update on the two singlet dark matter model

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Tanushree Basak ◽  
Baradhwaj Coleppa ◽  
Kousik Loho
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Galactic Center ◽  
Direct Detection ◽  
Dark Matter Candidate ◽  
The Standard Model ◽  
Matter Model ◽  
Relic Abundance ◽  
Dark Matter Model

Abstract We revisit the two real singlet extension of the Standard Model with a $$ {Z}_2\times {Z}_2^{\prime } $$ Z 2 × Z 2 ′ symmetry. One of the singlet scalars S2, by virtue of an unbroken $$ {Z}_2^{\prime } $$ Z 2 ′ symmetry, plays the role of a stable dark matter candidate. The other scalar S1, with spontaneously broken Z2-symmetry, mixes with the SM Higgs boson and acts as the scalar mediator. We analyze the model by putting in the entire set of theoretical and recent experimental constraints. The latest bounds from direct detection Xenon1T experiment severely restricts the allowed region of parameter space of couplings. To ensure the dark matter satisfies the relic abundance criterion, we rely on the Breit-Wigner enhanced annihilation cross-section. Further, we study the viability of explaining the observed gamma-ray excess in the galactic center in this model with a dark matter of mass in the ∼ 36 − 51 GeV window and present our conclusions.

scholarly journals The scalar singlet-triplet dark matter model

2014 ◽  
Vol 2014 (01) ◽  
pp. 032-032 ◽  
Author(s):  
O. Fischer ◽  
J.J. van der Bij
Keyword(s):  
Dark Matter ◽  
Matter Model ◽  
Dark Matter Model ◽  
Scalar Singlet

scholarly journals A new parameter space study of the fermionic cold dark matter model

2014 ◽  
Vol 2014 (10) ◽  
pp. 033-033 ◽  
Author(s):  
Z. Bagherian ◽  
M.M. Ettefaghi ◽  
Z. Haghgouyan ◽  
R. Moazzemi
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Cold Dark Matter ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
Dark Matter Model
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