Supersymmetric Dark Matter Candidates - The Lightest Neutralino, the Gravitino, and the Axino

Steffen, Frank Daniel

doi:10.48550/arxiv.0711.1240

Cited by 7 publications

(18 citation statements)

References 135 publications

(274 reference statements)

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“…[36]. The uncertainty on the Y e τ limit associated with CBBN of 6 Li reflects the difficulties in quantifying an upper limit on the primordial 6 Li abundance; for more details on this issue, see [36] and references therein. Note that the given limits correspond to upper limits on the primordial fractions of 9 Be/H and 6 Li/H of 2.1 × 10 −13 and 10 −11 − 10 −10 , respectively.…”

Section: Implications For Gravitino Dark Matter Scenariosmentioning

confidence: 99%

“…Note that the given limits correspond to upper limits on the primordial fractions of 9 Be/H and 6 Li/H of 2.1 × 10 −13 and 10 −11 − 10 −10 , respectively. Thus, the SUSY models which come with thermal relic stau abundances of Y e τ 2 × 10 −15 can respect each of these cosmological constraints independent of the stau lifetime if a primordial 6 Li/H abundance of about 10 −10 is viable. In particular, the limit of τ e τ 1 5 × 10 3 s and its implications-discussed in the Introduction-are then no longer valid even for a standard cosmological history with primordial temperatures of T > T f .…”

Section: Implications For Gravitino Dark Matter Scenariosmentioning

confidence: 99%

“…If the lightest supersymmetric particle (LSP) is assumed to be the LOSP, this parameter region is not considered because of severe upper limits on the abundance of massive stable charged particles [1]. However, for example, in axino/gravitino LSP scenarios [2,3,4,5,6] and in scenarios with broken R parity [7,8,9,10,11], 1 the τ LOSP becomes unstable and thereby a viable option. Indeed, supersymmetric models with a long-lived τ 1 LOSP are particularly promising for collider phenomenology [12,13,14,15,16,17,18,19,20,21,22,23,24]: Since the τ 1 LOSP could escape the collider detector as a quasi-stable muon-like particle, it can be associated with signatures that are very different from the excess in missing energy expected in neutralino LSP scenarios.…”

Section: Introductionmentioning

confidence: 99%

“…• The mere presence of the negatively charged τ 1 's at cosmic times of t 5 × 10 3 s can lead to ( 4 He τ 1 ) and ( 8 Be τ 1 ) bound states and can thereby allow for catalyzed BBN (CBBN) of 6 Li and 9 Be to abundances far above the ones obtained in standard BBN (SBBN) [33,34,35,36]. Indeed, confronting the abundances obtained in CBBN with observationally inferred bounds on the primordial abundances of 9 Be (and 6 Li) imposes restrictive upper limits of Y e τ 2×10 −15 (2×10 −15 -2×10 −16 ) for τ e τ 1 10 5 s; cf.…”

Section: Introductionmentioning

confidence: 99%

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Thermal relic abundances of long-lived staus

Pradler¹,

Steffen²

2009

Nuclear Physics B

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In supersymmetric models with a long-lived stau being the lightest Standard Model superpartner, the stau abundance during primordial nucleosynthesis is tightly constrained. Considering the complete set of stau annihilation channels in the minimal supersymmetric Standard Model (MSSM) with real parameters for scenarios in which sparticle coannihilations are negligible, we calculate the decoupling of the lighter stau from the primordial plasma and identify processes which are capable to deplete the resulting stau abundance significantly. We find particularly efficient stau annihilation at the resonance of the heavy CP-even Higgs boson and for a lighter stau with a sizeable left-right mixing due to enhanced stau-Higgs couplings. Even within the constrained MSSM, we encounter both effects leading to exceptionally small values of the resulting stau abundance. Prospects for collider phenomenology are discussed and possible implications of our findings are addressed with emphasis on gravitino dark matter scenarios.

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Section: Implications For Gravitino Dark Matter Scenariosmentioning

confidence: 99%

Section: Implications For Gravitino Dark Matter Scenariosmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal relic abundances of long-lived staus

Pradler¹,

Steffen²

2009

Nuclear Physics B

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“…Collider physics programs focus in connection with cosmology on two fundamental problems [102,103]; the particle character of cold dark matter (CDM), ρ CDM = 23±4%, and the mechanism responsible for the baryon asymmetry, ρ B = 4.0 ± 0.4%. These central problems cannot be solved within the framework of the SM, but various solutions have been worked out in the context of the BSM models.…”

Section: Dark Matter and Baryon Asymmetrymentioning

confidence: 99%

Complementarity of the CERN Large Hadron Collider and the $e^+e^-$ International Linear Collider

Choi

2008

Preprint

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The next-generation high-energy facilities, the CERN Large Hadron Collider (LHC) and the prospective e + e − International Linear Collider (ILC), are expected to unravel new structures of matter and forces from the electroweak scale to the TeV scale. In this report we review the complementary role of LHC and ILC in drawing a comprehensive and high-precision picture of the mechanism breaking the electroweak symmetries and generating mass, and the unification of forces in the frame of supersymmetry.

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Dark matter as a remnant of SQCD inflation

Bhattacharya

Saha

Sil

et al. 2018

J. High Energ. Phys.

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We propose a strongly coupled supersymmetric gauge theory that can accommodate both the inflation (in the form of generalized hybrid inflation) and dark matter (DM).In this set-up, we identify the DM as the Goldstones associated with the breaking of a global symmetry (SU (4) × SU (4) → SU (4)) after inflation ends. Due to the non-abelian nature of this symmetry, the scenario provides with multiple DMs. We then construct a low energy theory which generates a Higgs portal like coupling of the DMs with Standard Model (SM), thus allowing them to thermally freeze out. While the scales involved in the inflation either have a dynamical origin or related to UV interpretation in terms of a heavy quark field in the supersymmetric QCD (SQCD) sector, the DM masses however are generated from explicit breaking of the chiral symmetry of the SQCD sector. We discuss DM phenomenology for both degenerate and non-degenerate cases, poised with DM-DM interactions and find allowed region of parameter space in terms of relic density and direct search constraints. IntroductionAmidst the great success of the Standard Model (SM) of particle physics, there are several intriguing issues which indicate that the SM should be extended or supplemented by some other sector (including new fields and/or gauge symmetry) in order to provide a more complete description of nature. In particular, SM fails to accommodate a large share of energy density of the universe (25%), called dark matter (DM). On the other hand, the idea of primordial inflation serves as an elegant construction which can actually resolve some of the intricate problems (e.g horizon and flatness problems) of otherwise quite successful Big Bang cosmology. This inflationary hypothesis is further strengthened by its prediction on the primordial perturbation that leads to striking agreements with the observation of the cosmic microwave background radiation (CMBR) spectrum. However, SM alone can not be responsible for such 1 subhaditya@iitg.ac.in 2 abhijit.saha@iitg.ac.in 3 asil@iitg.ac.in

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Supersymmetric Dark Matter Candidates - The Lightest Neutralino, the Gravitino, and the Axino

Cited by 7 publications

References 135 publications

Thermal relic abundances of long-lived staus

Thermal relic abundances of long-lived staus

Complementarity of the CERN Large Hadron Collider and the $e^+e^-$ International Linear Collider

Dark matter as a remnant of SQCD inflation

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