Gravitino phenomenology and cosmological implications of supergravity

Andrea Ferrantelli

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Gravitino phenomenology and cosmological implications of supergravity

Andrea Ferrantelli

High Energy Physics - Phenomenology · Submitted 15 Feb 2010

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

The authors' main claim By demanding that the gravitinos thus produced provide with the observed Cold Dark Matter density, we modify previous results in the literature, and find that it is easy to account for gravitino Dark Matter with an arbitrarily low reheating temperature.

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What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.28 · human participants 0.01 · controlled comparison 0.03 · randomized assignment 0.01 · states quantitative result 0.11 · compares with prior results 0.89 · mentions code or data availability 0.01.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; show every role.

Gravitino production in the primordial Universe is investigated into details. After briefly reviewing inflation, supersymmetry and supergravity, we first study the scattering of massive W bosons in the thermal bath of particles, during the period of reheating. It is found that the process generates in the cross section terms which eventually lead to unitarity breaking above a certain scale. This happens by virtue of the supergravity vertex. We show that the longitudinal polarizations of the on-shell W become strongly interacting in the high energy limit, and that the inclusion of diagrams with off-shell scalars of the MSSM does not cancel the divergences. Next, we consider the dynamics and the decay into gravitinos of a scalar field S, which starts oscillating in its potential at the end of inflation. We embed S in a model of gauge mediation with metastable vacua, where the hidden sector is of the O'Raifeartaigh type. By demanding that the gravitinos thus produced provide with the observed Cold Dark Matter density, we modify previous results in the literature, and find that it is easy to account for gravitino Dark Matter with an arbitrarily low reheating temperature.

background contribution method result interpretation main claim

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	Gravitino production in the primordial Universe is investigated into details.	contribution 0.86	0.79	0.03	asserted 0.87
s1	After briefly reviewing inflation, supersymmetry and supergravity, we first study the scattering of massive W bosons in the thermal bath of particles, during the period of reheating.	contribution 0.54	0.63	0.02	asserted 0.59
s2	It is found that the process generates in the cross section terms which eventually lead to unitarity breaking above a certain scale.	result 1.00	0.92	0.05	asserted 1.00
s3	This happens by virtue of the supergravity vertex.	interpretation 0.85	0.48	0.02	asserted 0.99
s4	We show that the longitudinal polarizations of the on-shell W become strongly interacting in the high energy limit, and that the inclusion of diagrams with off-shell scalars of the MSSM does not cancel the divergences.	result 1.00	0.92	0.05	asserted 1.00
s5	Next, we consider the dynamics and the decay into gravitinos of a scalar field S, which starts oscillating in its potential at the end of inflation.	contribution 0.83	0.81	0.03	asserted 0.86
s6	We embed S in a model of gauge mediation with metastable vacua, where the hidden sector is of the O'Raifeartaigh type.	method 0.89	0.75	0.02	asserted 0.96
s7	By demanding that the gravitinos thus produced provide with the observed Cold Dark Matter density, we modify previous results in the literature, and find that it is easy to account for gravitino Dark Matter with an arbitrarily low reheating temperature.	result 0.98	0.94	0.81	asserted 0.99

What kind of paper the classifier reports this is: theoretical result 1.00 · evidence from proof or derivation 1.00.

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Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper

Original abstract

Gravitino production in the primordial Universe is investigated into details. After briefly reviewing inflation, supersymmetry and supergravity, we first study the scattering of massive W bosons in the thermal bath of particles, during the period of reheating. It is found that the process generates in the cross section terms which eventually lead to unitarity breaking above a certain scale. This happens by virtue of the supergravity vertex. We show that the longitudinal polarizations of the on-shell W become strongly interacting in the high energy limit, and that the inclusion of diagrams with off-shell scalars of the MSSM does not cancel the divergences. Next, we consider the dynamics and the decay into gravitinos of a scalar field S, which starts oscillating in its potential at the end of inflation. We embed S in a model of gauge mediation with metastable vacua, where the hidden sector is of the O'Raifeartaigh type. By demanding that the gravitinos thus produced provide with the observed Cold Dark Matter density, we modify previous results in the literature, and find that it is easy to account for gravitino Dark Matter with an arbitrarily low reheating temperature.

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References

How the literature uses it

3 arXiv papers cite this in 4 sentences

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

Papers whose main result relates to this one's

Found among the papers closest to this one by title and main claim. Pith's classifier compared each pair's main results and a second model family confirmed the relation; checked against two further families, shown conflicts agreed 118 times in 120 and shown same results 218 times in 239. The quoted sentence is the other paper's main claim.

States the same result 1 paper

For the case of an O'Raifeartaigh sector, we show that the observed dark matter density can be explained by gravitinos even for low reheating temperatures T_{R} < 10 GeV.

Cosmological evolution of scalar fields and gravitino dark matter in gauge mediation at low reheating temperatures · 0.85

What it cites · 80 sentences without a confident label

Uses the method or tool of 1 paper

The relevant Feynman rules which are used in the scattering calculations of paper [ref] are here summarised.

Scattering of massive W bosons into gravitinos and tree unitarity in broken supergravity · Feynman rules for the MSSM and SUGRA · 0.89

Uses data or values from 2 papers

The dimensionless parameter $h$ is defined in term of the Hubble scale as =100h km/sec/Mps , and its value has been recently measured as [ref] h=0.73±0.005 .

Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation · The matter content of the Universe · 1.00
The observations of the density perturbations by the COBE satellite [ref] provide with constraints on the inflaton mass, m≈10^-6 , and on the self-coupling [ref] , which is very small $λ≈10^-13$.

4-Year COBE DMR Cosmic Microwave Background Observations: Maps and Basic Results · Chaotic inflation · 0.87

Compares with 3 papers

Comparing the above with the previous results of [ref] , which assumed that oscillations about the minimum began at $_osc ≈m_S$ with $S_osc ≈√(2) c$ (for real $S$), we find n_s≈.n_s|_ET×(ac )^31m_S^6 , |acm_S^2|<1 , n_s≈.n_s|_ET×(ac )^21m_S^4 , |acm_S^2|>1 , where $.n_/s|_ET$ is the value given in [ref] .

Dark Matter in Gauge Mediated Supersymmetry Breaking using Metastable Vacua · Gravitino Dark Matter and reheating temperature · 1.00
In the paper [ref] we instead discuss gravitino production from the decay of a scalar field $S$.

Cosmological evolution of scalar fields and gravitino dark matter in gauge mediation at low reheating temperatures · Conclusions and outlook · 0.92
This expression agrees with the literature [ref] for $X=Y=0$.

Simple Scheme for Gauge Mediation · Contributions of global supersymmetry · 0.99

Cites as background 28 papers

Our discussion is based on the review by Lyth and Riotto [ref] and on Takeo Moroi's thesis [ref] , to which we refer for deeper analyses.

Particle Physics Models of Inflation and the Cosmological Density Perturbation · The matter content of the Universe · 0.91
In particular, BBN constraints on both unstable and stable gravitinos have been recently derived in Ref. [ref] , which contains an updated analysis of the gravitino problem in this context.

Big-Bang Nucleosynthesis and Gravitino · Cosmology: the gravitino problem · 0.93
It can follow from several sources: from the decay of the next to lightest SUSY particle (NLSP) [ref] , of the moduli fields [ref] , of the inflaton [ref] and of the SUSY breaking field [ref] .

Cosmological scenario of stop NLSP with gravitino LSP and the cosmic lithium problem · Cosmology: the gravitino problem · 0.97

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