Pati-Salam version of subcritical hybrid inflation

Bryant, B. Charles; Raby, Stuart

doi:10.1103/physrevd.93.095003

Cited by 12 publications

(12 citation statements)

References 30 publications

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“…Previous analyses showed that this model fits reasonably well to low energy observables such as gauge couplings, gauge boson masses, fermion masses, Cabibbo-Kobayashi-Maskawa (CKM) matrix elements, neutrino mass differences and mixing angles [3][4][5][6]. In addition, by including an inflation sector to the PS model, this model can fit the tensor-to-scalar ratio, the scalar spectral index, and the scalar power spectrum [7].…”

Section: Introductionmentioning

confidence: 74%

Pati-Salam SUSY GUT with Yukawa unification

2017

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Previous studies of a three family Yukawa unified supersymmetric grand unified theory (SUSY GUT) with SO(10) or Pati-Salam (PS) gauge symmetry proposed by Raby and students show that this model is able to fit low energy and inflation observables. However, the fit to low energy observables is not great especially for sin 2β, and up and down quark masses. In this paper, we show that by choosing PS as the gauge group and modifying the Yukawa sector, the low energy fit improves significantly while other qualities of the model are maintained. In particular, the lightest SUSY particle is the neutralino with mass of order 300 -500 GeV, the lightest stop and sbottom have mass of order 3 -5 TeV and the CP odd Higgs mass is of order 5 -6 TeV, so we are in the decoupling limit for the light Higgs. In addition, we reinterpret gluino simplified model analyses by the * poh.7@osu.edu † raby.1@osu.edu ‡ 1300011456@pku.edu.cn ATLAS and CMS collaborations and find that the most stringent gluino mass bound for our model is Mg ∼ 1.9 TeV. The current best fit point, consistent with this bound, with gluino mass Mg = 1.9 TeV has χ 2 /dof ≈ 1.12, compared to the best fit point of the previous model with χ 2 /dof = 1.90. We find that predictions for the electric dipole moment of the electron, the branching ratio BR(µ → eγ) and the CP violating angle in the lepton sector, sin δ, are affected significantly as compared to previous results. In summary, we are unable to rule out this model or place an upper bound on gluino mass accessible by this run of the LHC because the χ 2 /dof of this model is well below 2σ even for a gluino mass as high as 2.7 TeV. On the bright side, this means that this model is still viable and we might find low energy SUSY particles in the near future.

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Section: Introductionmentioning

confidence: 74%

Pati-Salam SUSY GUT with Yukawa unification

2017

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“…Large values of s crit can, e.g., be achieved in combination with a shift symmetry along the inflaton direction in the Kähler potential [138,139]. In this case, a significant amount of inflation can even occur at subcritical field values, s < s crit , while the combined inflaton-waterfall-field system slowly rolls towards the true vacuum (see also [140][141][142]). However, in this paper, we will neglect this possibility and simply focus on the standard scenario of inflation prior to the waterfall transition.…”

Section: Inflation Close To the Waterfall Phase Transitionmentioning

confidence: 99%

“…The upper bound on κ is slightly smaller than the critical κ value in Eq. (140). This means that the cosmic string bound can only be circumvented for κ values deep inside the small-κ regime.…”

Section: (160)mentioning

confidence: 99%

Axion isocurvature perturbations in low-scale models of hybrid inflation

Schmitz

Yanagida

2018

Phys. Rev. D

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The QCD axion solves the strong CP problem and represents an attractive particle candidate for cold dark matter (CDM). However, quantum fluctuations of the axion field during inflation easily result in large CDM isocurvature perturbations that are in conflict with observations of the cosmic microwave background (CMB). In this paper, we demonstrate how this problem can be solved in low-scale models of hybrid inflation that may emerge from supersymmetric grand unified theories. We consider both F-term hybrid inflation (FHI) and D-term hybrid inflation (DHI) in supergravity, explicitly taking into account the effect of hidden-sector supersymmetry breaking.We discuss the production of cosmic strings and show how the soft terms in the scalar potential readily allow to achieve the correct scalar spectral index. In both cases, we are able to identify large regions in parameter space that are consistent with all constraints. In particular, we find that evading the CDM isocurvature constraint always requires a small Yukawa or gauge coupling of O 10 −3 or smaller. This translates into upper bounds on the gravitino mass of O 10 5 GeV in FHI and O 10 9 GeV in DHI. Our results point to interesting scenarios in well-motivated parameter regions that will be tested in future axion and CMB experiments.

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“…3 The opposite scenario, κ ≪ g, has been considered in [62,63] (see also [64][65][66][67]), which results in a super-Planckian critical field value, s crit > M Pl . In this case, inflation occurs during the waterfall transition and leads to an O (0.1) tensor-to-scalar ratio.…”

Section: Introductionmentioning

confidence: 99%

Trans-Planckian censorship and inflation in grand unified theories

Schmitz

2020

Physics Letters B

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The recently proposed trans-Planckian censorship conjecture (TCC) amounts to the claim that inflation models with an inflationary energy scale larger than Λ max inf ∼ 10 9 GeV belong to the swampland, i.e., cannot be embedded into a consistent theory of quantum gravity. In this paper, we point out that this constraint can be readily satisfied in D-term hybrid inflation (DHI), which is a well-motivated inflation scenario in the context of supersymmetric grand unification. In DHI, the amplitude of the primordial scalar power spectrum originates from a Fayet-Iliopoulos term of the order of the unification scale, √ ξ ∼ 10 16 GeV. At the same time, the TCC results in an upper bound on the corresponding gauge coupling constant of gmax ∼ 10 −14 . We are able to show that this constraint translates into an upper bound on the gravitino mass of m max 3/2 ∼ 10 MeV, which opens the possibility that dark matter is accounted for by thermally produced gravitinos, if the reheating temperature is close to T reh ∼ 100 TeV. Interestingly enough, a somewhat similar gravitino mass range has recently been derived in a model that aims at explaining dark energy in terms of axion quintessence and resolving the Hubble tension by means of decaying gravitino dark matter.

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Pati-Salam version of subcritical hybrid inflation

Cited by 12 publications

References 30 publications

Pati-Salam SUSY GUT with Yukawa unification

Pati-Salam SUSY GUT with Yukawa unification

Axion isocurvature perturbations in low-scale models of hybrid inflation

Trans-Planckian censorship and inflation in grand unified theories

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