Big bang nucleosynthesis with bound states of long-lived charged particles

Kaplinghat, Manoj; Rajaraman, Arvind

doi:10.1103/physrevd.74.103004

Cited by 93 publications

(117 citation statements)

References 35 publications

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“…We found in our restricted mSUGRA scenarios either a neutralino, a sneutrino or a stau LSP. As has been recently investigated in some detail the cosmological bounds on a long-lived charged particle for example from nucleosynthesis are very different for charged [79,82,83,84] and neutral particles [75,76,77,78,79,80,81,81]. For example the long-lived charged particles can form bound states with the free nuclei thus affecting their nuclear reactions, which in turn directly affects the abundance of the light elements [83].…”

Section: B Sparticle Decaysmentioning

confidence: 99%

Mass spectrum in R-parity violating minimal supergravity and benchmark points

et al. 2007

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We investigate in detail the low-energy spectrum of the R-parity violating minimal supergravity model using the computer program SOFTSUSY. We impose the experimental constraints from the measurement of the anomalous magnetic moment of the muon, (g − 2)µ, the decay b → sγ as well as the mass bounds from direct searches at colliders, in particular on the Higgs boson and the lightest chargino. We also include a new calculation for the R parity violating contribution to Br(Bs → µ + µ − ). We then focus on cases where the lightest neutralino is not the lightest supersymmetric particle (LSP). In this region of parameter space either the lightest scalar tau (stau) or the scalar tau neutrino (tau sneutrino) is the LSP. We suggest four benchmark points with typical spectra and novel collider signatures for detailed phenomenological analysis and simulation by the LHC collaborations.

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Section: B Sparticle Decaysmentioning

confidence: 99%

Mass spectrum in R-parity violating minimal supergravity and benchmark points

et al. 2007

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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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“…However, only in the last two years after the appearance of Ref. [12], a lot of work has been done [15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33] in order to refine various aspects of catalysis and to understand the implications of CBBN in the framework of specific models. The significant interest in CBBN is also fuelled by its direct connection with collider physics.…”

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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Big bang nucleosynthesis with bound states of long-lived charged particles

Cited by 93 publications

References 35 publications

Mass spectrum in R-parity violating minimal supergravity and benchmark points

Mass spectrum in R-parity violating minimal supergravity and benchmark points

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

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