Gravitino production in a thermal Universe revisited

Arya, Richa; Mahajan, Namit; Rangarajan, Raghavan

doi:10.1016/j.physletb.2017.06.038

Cited by 4 publications

(4 citation statements)

References 69 publications

(93 reference statements)

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“…For the signal to be observable, the Qballs must decay when the temperature falls in the range 20 GeV < T dec < 2 × 10 7 GeV. The upper bound is frequently satisfied even for large reheating temperatures, although a low reheating temperature is often preferred to avoid overproduction of gravitinos, though the exact bound on the reheating temperature depends on the mass of the gravitino [46][47][48][49]. We have imposed T R < 10 7 GeV for all benchmarks.…”

Section: Resultsmentioning

confidence: 99%

Detectable Gravitational Wave Signals from Affleck-Dine Baryogenesis

White,

Pearce,

Vagie

et al. 2021

Preprint

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In Affleck-Dine baryogenesis, the observed baryon asymmetry of the Universe is generated through the evolution of the vacuum expectation value (VEV) of a scalar condensate. This scalar condensate generically fragments into non-topological solitons (Q-balls). If they are sufficiently long-lived, they lead to an early matter domination epoch, which enhances the primordial gravitational wave signal for modes that enter the horizon during this epoch. The sudden decay of the Q-balls into fermions results in a rapid transition from matter to radiation domination, producing a sharp peak in the gravitational wave power spectrum. Avoiding the problem of gravitino over-abundance favours scenarios where the peak frequency of the resonance is within the range of the Einstein Telescope and/or Decigo. Therefore, we show this scenario provides an observable signal, providing a mechanism to test Affleck-Dine baryogenesis.

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Section: Resultsmentioning

confidence: 99%

Detectable Gravitational Wave Signals from Affleck-Dine Baryogenesis

White,

Pearce,

Vagie

et al. 2021

Preprint

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“…The thermal production of gravitinos has been discussed in a variety of papers. A brief list of these include [76][77][78][79][80][81][82][83][84]. In supersymmetric QCD the processes that produce the gravitino include…”

Section: The Gravitino Decay Constraintsmentioning

confidence: 99%

Supergravity models with 50–100 TeV scalars, supersymmetry discovery at the LHC, and gravitino decay constraints

Aboubrahim¹,

Nath²

2017

Phys. Rev. D

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We investigate the possibility of testing supergravity unified models with scalar masses in the range 50-100 TeV and much lighter gaugino masses at the Large Hadron Collider. The analysis is carried out under the constraints that models produce the Higgs boson mass consistent with experiment and also produce dark matter consistent with WMAP and PLANCK experiments. A set of benchmarks in the supergravity parameter space are investigated using a combination of signal regions which are optimized for the model set. It is found that some of the models with scalar masses in the 50-100 TeV mass range are discoverable with as little as 100 fb −1 of integrated luminosity and should be accessible at the LHC RUN II. The remaining benchmark models are found to be discoverable with less than 1000 fb −1 of integrated luminosity and thus testable in the high luminosity era of the LHC, i.e., at HL-LHC. It is shown that scalar masses in the 50-100 TeV range but gaugino masses much lower in mass produce unification of gauge coupling constants, consistent with experimental data at low scale, with as good an accuracy (and sometimes even better) as models with low (O(1) TeV) weak scale supersymmetry. Decay of the gravitinos for the supergravity model benchmarks are investigated and it is shown that they decay before the Big Bang Nucleosynthesis (BBN). Further, we investigate the non-thermal production of neutralinos from gravitino decay and it is found that the non-thermal contribution to the dark matter relic density is negligible relative to that from the thermal production of neutralinos for reheat temperature after inflation up to 10 9 GeV. An analysis of the direct detection of dark matter for SUGRA models with high scalar masses is also discussed. SUGRA models with scalar masses in the range 50-100 TeV have several other attractive features such as they help alleviate the SUSY CP problem and help suppress proton decay from baryon and lepton number violating dimension five operators. *

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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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“…See also[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] for various gravitino production calculations.…”

mentioning

confidence: 99%

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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Gravitino production in a thermal Universe revisited

Cited by 4 publications

References 69 publications

Detectable Gravitational Wave Signals from Affleck-Dine Baryogenesis

Detectable Gravitational Wave Signals from Affleck-Dine Baryogenesis

Supergravity models with 50–100 TeV scalars, supersymmetry discovery at the LHC, and gravitino decay constraints

Cosmological implications of theories beyond the standard model of particle physics

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