Gravitino Dark Matter and Light Element Adundances

Vassilis C. Spanos

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Gravitino Dark Matter and Light Element Adundances

Vassilis C. Spanos

High Energy Physics - Phenomenology · Submitted 28 Oct 2007

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim For shorter lifetimes of order 1000 s, it appears that stau bound state effect could reduce the Li7 abundance from standard BBN values while at the same time enhancing the Li6 abundance, creating a region where both lithium abundances match their plateau values.

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What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.25 · human participants 0.01 · controlled comparison 0.28 · randomized assignment 0.01 · states quantitative result 0.95 · compares with prior results 0.62 · mentions code or data availability 0.02.

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We discuss the scenario where the gravitino is the lightest supersymmetric particle and the long-lived next-to-lightest sparticle (NSP) is the neutralino or the stau, the charged partner of the tau lepton. In this case staus form bound states with several nuclei, affecting the cosmological abundances of Li6 and Li7 by enhancing nuclear rates that would otherwise be strongly suppressed. We consider the effects of these enhanced rates on the final abundances produced in Big-Bang nucleosynthesis (BBN), including injections of both electromagnetic and hadronic energy during and after BBN. We show that if the stau lifetime is longer than 10^3-10^4 s, the abundances of Li6 and Li7 are far in excess of those allowed by observations. For shorter lifetimes of order 1000 s, it appears that stau bound state effect could reduce the Li7 abundance from standard BBN values while at the same time enhancing the Li6 abundance, creating a region where both lithium abundances match their plateau values.

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What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	We discuss the scenario where the gravitino is the lightest supersymmetric particle and the long-lived next-to-lightest sparticle (NSP) is the neutralino or the stau, the charged partner of the tau lepton.	background 0.72	0.21	0.03	asserted 0.45
s1	In this case staus form bound states with several nuclei, affecting the cosmological abundances of Li6 and Li7 by enhancing nuclear rates that would otherwise be strongly suppressed.	background 0.54	0.21	0.08	asserted 0.98
s2	We consider the effects of these enhanced rates on the final abundances produced in Big-Bang nucleosynthesis (BBN), including injections of both electromagnetic and hadronic energy during and after BBN.	contribution 0.73	0.69	0.04	asserted 0.54
s3	We show that if the stau lifetime is longer than 10^3-10^4 s, the abundances of Li6 and Li7 are far in excess of those allowed by observations.	result 1.00	0.87	0.39	asserted 1.00
s4	For shorter lifetimes of order 1000 s, it appears that stau bound state effect could reduce the Li7 abundance from standard BBN values while at the same time enhancing the Li6 abundance, creating a region where both lithium abundances match their plateau values.	result 0.97	0.79	0.42	hedged possibility 1.00

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Original abstract

We discuss the scenario where the gravitino is the lightest supersymmetric particle and the long-lived next-to-lightest sparticle (NSP) is the neutralino or the stau, the charged partner of the tau lepton. In this case staus form bound states with several nuclei, affecting the cosmological abundances of Li6 and Li7 by enhancing nuclear rates that would otherwise be strongly suppressed. We consider the effects of these enhanced rates on the final abundances produced in Big-Bang nucleosynthesis (BBN), including injections of both electromagnetic and hadronic energy during and after BBN. We show that if the stau lifetime is longer than 10^3-10^4 s, the abundances of Li6 and Li7 are far in excess of those allowed by observations. For shorter lifetimes of order 1000 s, it appears that stau bound state effect could reduce the Li7 abundance from standard BBN values while at the same time enhancing the Li6 abundance, creating a region where both lithium abundances match their plateau values.

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Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

What it cites · 18 sentences without a confident label

Uses the method or tool of 3 papers

To do this we solve numerically the Boltzmann equations (13) and (14) from [ref] , that control these abundances.

Big Bang Nucleosynthesis with Long Lived Charged Massive Particles · Bound-State Effects · 1.00
These spectra and the fraction of the energy of the decaying particle that is injected as EM energy are then used to calculate the light-element abundances, as it is described in [ref] .

Bound-State Effects on Light-Element Abundances in Gravitino Dark Matter Scenarios · NSP Decays and resulting showers during BBN · 0.98
Having calculated the partial decay widths and branching ratios, we employ the PYTHIA event generator [ref] to model both the EM and the HD spectra of the NSP decays.

High-Energy-Physics Event Generation with PYTHIA 6.1 · NSP Decays and resulting showers during BBN · 1.00

Cites as background 14 papers

The primordial Big-Bang nucleosynthesis (BBN) predictions for the light elements abundance provide some of the most stringent constraints on the decays of unstable massive particles during the early Universe [ref] .

Primordial nucleosynthesis and hadronic decay of a massive particle with a relatively short lifetime · Introduction · 0.88
The primordial Big-Bang nucleosynthesis (BBN) predictions for the light elements abundance provide some of the most stringent constraints on the decays of unstable massive particles during the early Universe [ref] .

Big-Bang Nucleosynthesis with Unstable Gravitino and Upper Bound on the Reheating Temperature · Introduction · 0.88
The primordial Big-Bang nucleosynthesis (BBN) predictions for the light elements abundance provide some of the most stringent constraints on the decays of unstable massive particles during the early Universe [ref] .

Big Bang Nucleosynthesis Constraints on Hadronically and Electromagnetically Decaying Relic Neutral Particles · Introduction · 0.88

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