Suppressing gravitino thermal production with a temperature-dependent messenger coupling

Badziak, Marcin; Dalianis, Ioannis; Lalak, Zygmunt

doi:10.1007/jhep02(2016)173

Cited by 4 publications

(6 citation statements)

References 63 publications

(119 reference statements)

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“…As expected, see e.g. [24,25,26], we find that most of parameter space of supersymmetric theories yields an excessive dark matter abundance. Our perspective in this work is that the parameter space that yields an excessive dark matter abundance should not be faced as a cosmologically forbidden one but, on the contrary, as a parameter space that favours a different cosmic history for the very early universe.…”

Section: Introductionsupporting

confidence: 89%

“…There are scenarios in the literature that reconcile gravitino cosmology with high reheating temperatures [53,56,26,54] and generally assume non-minimal features for the hidden sector. For example when the messengers masses lay in the range M mess 10 6 GeV and the goldstino does not reside in a single chiral superfield [56], or when the messenger coupling is controlled by the VEV of another field [26] it is possible that gravitinos have the right abundance. These supersymmetry breaking schemes do not require dilution and predict ∆n s = 0 and ∆r = 0.…”

Section: The N S and R Predictions For Particular Supersymmetry Breakmentioning

confidence: 99%

“…It is though possible that the supersymmetry breaking sector leads to a suppressed Ω 3/2 , e.g due to R-symmetry restoration[53], or a high temperature decoupling of the messenger fields[26], or due to the dynamics of the sgoldstino field[54], or due to feeble couplings in the supersymmetry breaking sector[55].…”

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confidence: 99%

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Probing the BSM physics with CMB precision cosmology: an application to supersymmetry

Dalianis

Watanabe

2018

J. High Energ. Phys.

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The cosmic history before the BBN is highly determined by the physics that operates beyond the Standard Model (BSM) of particle physics and it is poorly constrained observationally. Ongoing and future precision measurements of the CMB observables can provide us with significant information about the pre-BBN era and hence possibly test the cosmological predictions of different BSM scenarios. Supersymmetry is a particularly motivated BSM theory and it is often the case that different superymmetry breaking schemes require different cosmic histories with specific reheating temperatures or low entropy production in order to be cosmologically viable. In this paper we quantify the effects of the possible alternative cosmic histories on the n s and r CMB observables assuming a generic non-thermal stage after cosmic inflation. We analyze TeV and especially multi-TeV supersymmetry breaking schemes assuming the neutralino and gravitino dark matter scenarios. We complement our analysis considering the Starobinsky R 2 inflation model to exemplify the improved CMB predictions that a unified description of the early universe cosmic evolution yields. Our analysis underlines the importance of the CMB precision measurements that can be viewed, to some extend, as complementary to the laboratory experimental searches for supersymmetry or other BSM theories.

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Section: Introductionsupporting

confidence: 89%

Section: The N S and R Predictions For Particular Supersymmetry Breakmentioning

confidence: 99%

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Probing the BSM physics with CMB precision cosmology: an application to supersymmetry

Dalianis

Watanabe

2018

J. High Energ. Phys.

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“…In section 4, we detail a study of DV signatures, starting with recasting the current ATLAS multi-track DV + jets analysis and showing that current searches are not sensitive to our model. By changing the cuts, we suggest ways in which the DV cuts can be loosened, and how cuts on accompanying hard prompt objects can be used to combat background dark matter candidate even for large reheating temperatures that are compatible with thermal leptogenesis [31].…”

Section: Introductionmentioning

confidence: 99%

Prompt signals and displaced vertices in sparticle searches for next-to-minimal gauge-mediated supersymmetric models

et al. 2016

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We study the LHC phenomenology of the nextto-minimal model of gauge-mediated supersymmetry breaking, both for Run I and Run II. The Higgs phenomenology of the model is consistent with observations: a 125 GeV standard model-like Higgs which mixes with singlet-like state of mass around 90 GeV that provides a 2σ excess at LEP II. The model possesses regions of parameter space where a longer-lived lightest neutralino decays in the detector into a gravitino and a b-jet pair or a tau pair resulting in potential displaced vertex signatures. We investigate current bounds on sparticle masses and the discovery potential of the model, both via conventional searches and via searches for displaced vertices. The searches based on promptly decaying sparticles currently give a lower limit on the gluino mass 1080 GeV and could be sensitive up to 1900 GeV with 100 fb −1 , whereas the current displaced vertex searches cannot probe this model due to b-quarks in the final state. We show how the displaced vertex cuts might be relaxed in order to improve signal efficiency, while simultaneously applied prompt cuts reduce background, resulting in a much better sensitivity than either strategy alone and motivating a fully fledged experimental study. a

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“…Δείτε επίσης τα[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] για διάφορους υπολογισμούς παραγωγής βαρυτίνων.…”

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Cosmological implications of theories beyond the standard model of particle physics

Gialamas¹,

Γιαλαμάς²

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Στο πρώτο μέρος της διατριβής, υπολογίζεται ο ρυθμός παραγωγής βαρυτίνων, μέσω της θερμικής ιδιοενέργειας σε επίπεδο ενός-βρόχου. Επίσης, παρέχουμε μια εύχρηστη φόρμουλα για τον ρυθμό παραγωγής και τη θερμική αφθονία των βαρυτίνων, σε συνάρτηση με τη θερμοκρασία αναθέρμανσης του Σύμπαντος. Η αφθονία των βαρυτίνων συγκρίνεται με την παρατηρούμενη σκοτεινή ύλη. Στο δεύτερο μέρος της διατριβής θεωρούμε την τετραγωνική βαρύτητα σε Palatini φορμαλισμό υποθέτοντας την ύπαρξη βαθμωτών πεδίων συνδεδεμένων με τη βαρύτητα. Όταν τα βαθμωτά πεδία αναπτύξουν την αναμενόμενη τιμή του κενού τους η κλίμακα Planck δημιουργείται δυναμικά. Το αποτέλεσμα των τετραγωνικών όρων καμπυλότητας είναι η μείωση της τιμής του λόγου τανυστή-βαθμωτού r. Οι πληθωριστικές προβλέψεις όλων των υπό εξέταση μοντέλων διαπιστώνεται ότι συμφωνούν με τα τελευταία παρατηρητικά δεδομένα που έχουν τεθεί από τη συνεργασία Planck για ένα ευρύ φάσμα των εμπλεκόμενων παραμέτρων.

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Suppressing gravitino thermal production with a temperature-dependent messenger coupling

Cited by 4 publications

References 63 publications

Probing the BSM physics with CMB precision cosmology: an application to supersymmetry

Probing the BSM physics with CMB precision cosmology: an application to supersymmetry

Prompt signals and displaced vertices in sparticle searches for next-to-minimal gauge-mediated supersymmetric models

Cosmological implications of theories beyond the standard model of particle physics

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