Big-bang nucleosynthesis with long-lived charged slepton

Kawasaki, Masahiro; Kohri, Kazunori; Moroi, Takeo

doi:10.1016/j.physletb.2007.03.063

Cited by 87 publications

(163 citation statements)

References 26 publications

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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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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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“…Assuming a standard cosmological history that leads to a typical thermal l 1 relic abundance, the bound from 6 Li catalysis translates into an upper limit on the l 1 lifetime of τ e l 1 = τ X − < ∼ 5 × 10 3 s [12,20,22,26]. In collider-accessible regions of the parameter space, this limit is found to be considerably more restrictive than the BBN constraints associated with electromagnetic/hadronic energy release from l 1 decays [17,18,19,22,28,32]. The τ e l 1 limit implies a gravitino mass m e G well below 10% of the slepton NLSP mass m e l 1 for m e l 1 < ∼ O(1 TeV) [18].…”

Section: Introductionmentioning

confidence: 99%

Constraints on supersymmetric models from catalytic primordial nucleosynthesis of beryllium

Pospelov

Pradler²,

Steffen³

2008

J. Cosmol. Astropart. Phys.

139

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The catalysis of nuclear reactions by negatively charged relics leads to increased outputs of primordial 6 Li and 9 Be. In combination with observational constraints on the primordial fractions of 6 Li and 9 Be, this imposes strong restrictions on the primordial abundance and the lifetime of charged relics. We analyze the constraints from the catalysis of 9 Be on supersymmetric models in which the gravitino is the lightest supersymmetric particle and a charged slepton-such as the lighter stau-the next-to-lightest supersymmetric particle (NLSP). Barring the special cases in which the primordial fraction of the slepton NLSP is significantly depleted, we find that the 9 Be data require a slepton NLSP lifetime of less than 6 × 10 3 s. We also address the issue of the catalytic destruction of 6 Li and 9 Be by late forming bound states of protons with negatively charged relics finding that it does not lead to any significant modification of the limit on the slepton lifetime.

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“…In the considered gravitino LSP scenarios, this bound applies directly to the lifetime of the l 1 NLSP [7,15,23,42,43,44,45,46,47,48]: τ e l1 5 × 10 3 s. 2 This implies m e G 0.1 m e l1 in the colliderfriendly mass range of m e l1 1 TeV. Accordingly, the region 0.1 m e l1 m e G < m e l1 , in which the kinematical m e G determination appears feasible, seems to be excluded by BBN constraints [44].…”

Section: Introductionmentioning

confidence: 99%

Probing the reheating temperature at colliders and with primordial nucleosynthesis

Steffen¹

2008

Physics Letters B

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Considering gravitino dark matter scenarios with a long-lived charged slepton, we show that collider measurements of the slepton mass and its lifetime can probe not only the gravitino mass but also the post-inflationary reheating temperature TR. In a model independent way, we derive upper limits on TR and discuss them in light of the constraints from the primordial catalysis of 6 Li through bound-state effects. In the collider-friendly region of slepton masses below 1 TeV, the obtained conservative estimate of the maximum reheating temperature is about TR = 3×10 9 GeV for the limiting case of a small gluino-slepton mass splitting and about TR = 10 8 GeV for the case that is typical for universal soft supersymmetry breaking parameters at the scale of grand unification. We find that a determination of the gluino-slepton mass ratio at the Large Hadron Collider will test the possibility of TR > 10 9 GeV and thereby the viability of thermal leptogenesis with hierarchical heavy right-handed Majorana neutrinos.PACS numbers: 98.80. Cq, 95.35.+d, 12.60.Jv, 95.30.Cq

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Big-bang nucleosynthesis with long-lived charged slepton

Cited by 87 publications

References 26 publications

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

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

Constraints on supersymmetric models from catalytic primordial nucleosynthesis of beryllium

Probing the reheating temperature at colliders and with primordial nucleosynthesis

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