Stau-catalyzed 6Li production in big-bang nucleosynthesis

Hamaguchi, Koichi; Hatsuda, Tetsuo; Kamimura, M.; Kino, Yasushi; Yanagida, Tsutomu T.

doi:10.1016/j.physletb.2007.05.030

Cited by 125 publications

(268 citation statements)

References 29 publications

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“…When such bound states occur, they catalyze certain nuclear reactions such as 4 He(D, γ) 6 Li, which is normally highly suppressed due to the production of a lowenergy γ, whereas the bound-state reaction is not [102,103,104]. In Fig.…”

Section: The Cmssmmentioning

confidence: 99%

Supersymmetric dark matter candidates

Ellis

Olive²

2010

Particle Dark Matter

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CERN-PH-TH/2010-004, UMN-TH-2831/10, FTPI-MINN-10/02After reviewing the theoretical, phenomenological and experimental motivations for supersymmetric extensions of the Standard Model, we recall that supersymmetric relics from the Big Bang are expected in models that conserve R parity. We then discuss possible supersymmetric dark matter candidates, focusing on the lightest neutralino and the gravitino. In the latter case, the next-to-lightest supersymmetric particle is expected to be long-lived, and possible candidates include spartners of the tau lepton, top quark and neutrino. We then discuss the roles of the renormalization-group equations and electroweak symmetry breaking in delimiting the supersymmetric parameter space. We discuss in particular the constrained minimal extension of the Standard Model (CMSSM), in which the supersymmetry-breaking parameters are assumed to be universal at the grand unification scale, presenting predictions from a frequentist analysis of its parameter space. We also discuss astrophysical and cosmological constraints on gravitino dark matter models, as well as the parameter space of minimal supergravity (mSUGRA) models in which there are extra relations between the trilinear and bilinear supersymmetry-breaking parameters, and between the gravitino and scalar masses. Finally, we discuss models with non-universal supersymmetry-breaking contributions to Higgs masses, and models in which the supersymmetry-breaking parameters are universal at some scale below that of grand unification. From 'Particle Dark Matter: Observations, Models and Searches' edited byGianfranco Bertone

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Section: The Cmssmmentioning

confidence: 99%

Supersymmetric dark matter candidates

Ellis

Olive²

2010

Particle Dark Matter

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“…Furthermore, we have also performed numerical calculation by using the enhancement factor presented in [11] for 7 Li and 7 Be productions. (Notice that, for 6 Li production process (3), the formula given in [11] predicts reaction rate which is one order of magnitude larger than the result of the detailed calculation given in [14].) Then we have checked that, even with these modifications of reaction rates, constraint from 7 Li is much less stringent than that from 6 Li.…”

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confidence: 94%

Big-bang nucleosynthesis with long-lived charged slepton

2007

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We consider constraints on long-lived charged scalar leptonsl ± in supersymmetric models, where gravitino is the lightest superparticle. We study the decay and hadronization processes ofl ± . We also take into account the significant enhancement of 6 Li production due to the formation of the bound-state ( 4 Hel − ); for this purpose, we use the reaction rate given by the most recent calculation based on coupled-channel method.

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“…For example, the stau can be the next lightest supersymmetric particle (NLSP) when the gravitino is the LSP (Buchmüller et al 2006). It is well-known that CHAMPs could affect the big bang nucleosynthesis (BBN) reaction rates and thus change the abundance of light elements (Pospelov 2007;Kohri & Takayama 2007;Kaplinghat & Rajaraman 2006;Cyburt et al 2006;Steffen 2007;Hamaguchi et al 2007;Kawasaki et al 2007;Jedamzik 2008a,b;Jittoh et al 2011). Several authors (Sigurdson & Kamionkowski 2004;Kohri & Takahashi 2010) suggest the possibility that CHAMPs with a lifetime about 1 yr can act effectively as WDM through acoustic oscillations in the thermal background.…”

Section: Introductionmentioning

confidence: 99%

Structure of dark matter halos in warm dark matter models and in models with long-lived charged massive particles

Kamada

Yoshida

Kohri

et al. 2013

J. Cosmol. Astropart. Phys.

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We study the formation of non-linear structures in Warm Dark Matter (WDM) models and in a Long-Lived Charged Massive Particle (CHAMP) model. CHAMPs with a decay lifetime of about 1 yr induce characteristic suppression in the matter power spectrum at subgalactic scales through acoustic oscillations in the thermal background. We explore structure formation in such a model. We also study three WDM models, where the dark matter particles are produced through the following mechanisms: i) WDM particles are produced in the thermal background and then kinematically decoupled; ii) WDM particles are fermions produced by the decay of thermal heavy bosons; and iii) WDM particles are produced by the decay of non-relativistic heavy particles. We show that the linear matter power spectra for the three models are all characterised by the comoving Jeans scale at the matter-radiation equality. Furthermore, we can also describe the linear matter power spectrum for the Long-Lived CHAMP model in terms of a suitably defined characteristic cut-off scale k Ch , similarly to the WDM models. We perform large cosmological N -body simulations to study the non-linear growth of structures in these four models. We compare the halo mass functions, the subhalo mass functions, and the radial distributions of subhalos in simulated Milky Way-size halos. For the characteristic cut-off scale k cut = 51 h Mpc −1 , the subhalo abundance -2 -(∼ 10 9 M sun ) is suppressed by a factor of ∼ 10 compared with the standard ΛCDM model. We then study the models with k cut ≃ 51, 410, 820 h Mpc −1 , and confirm that the halo and the subhalo abundances and the radial distributions of subhalos are indeed similar between the different WDM models and the Long-Lived CHAMP model. The result suggests that the cut-off scale k cut not only characterises the linear power spectra but also can be used to predict the non-linear clustering properties. The radial distribution of subhalos in Milky Way-size halos is consistent with the observed distribution for k cut ∼ 50 − 800 h Mpc −1 ; such models resolve the so-called "missing satellite problem".

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Stau-catalyzed 6Li production in big-bang nucleosynthesis

Cited by 125 publications

References 29 publications

Supersymmetric dark matter candidates

Supersymmetric dark matter candidates

Big-bang nucleosynthesis with long-lived charged slepton

Structure of dark matter halos in warm dark matter models and in models with long-lived charged massive particles

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