Minimal Supersymmetric Hybrid Inflation, Flipped SU(5) and Proton Decay

In F-term supergravity inflation models, scalar fields other than the inflaton generically receive a Hubble-induced mass, which may restore gauge symmetries during inflation and phase transitions may occur during or after inflation as the Hubble parameter decreases. We study monopole (and domain wall) production associated with such a phase transition in chaotic inflation in supergravity and obtain a severe constraint on the symmetry breaking scale which is related with the tensor-toscalar ratio. Depending on model parameters, it is possible that monopoles are sufficiently diluted to be free from current constraints but still observable by planned experiments.

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“…Ref. [38]. Generally, however, inflation does not need to be embedded in the GUT-breaking sector 4 .…”

Section: Phase Transition In F-term Inflationmentioning

confidence: 99%

Phase transition and monopole production in supergravity inflation

2012

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“…where x = |S|/M ξ , M 2 ξ = M 2 (4/27ξ 2 − 1) and γ S = 1 − 7κ S 2 + 2κ 2 S − 3κ SS . We restrict ourselves to κ 10 −3 and neglect contribution of soft SUSY breaking terms assuming soft masses of order 1 TeV [6,21,22].…”

Section: Sugra Corrections and Non-minimal Kähler Potentialmentioning

confidence: 99%

Inflation in Supersymmetric SU(5)

Khalil,

Rehman,

Shafi

et al. 2010

Preprint

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We analyze the adjoint field inflation in supersymmetric (SUSY) SU (5) model. In minimal SUSY SU (5) hybrid inflation monopoles are produced at the end of inflation. We therefore explore the non-minimal model of inflation based on SUSY SU (5), like shifted hybrid inflation, which provides a natural solution for the monopole problem. We find that the supergravity corrections with non-minimal Kähler potential are crucial to realize the central value of the scalar spectral index n s ≃ 0.96 consistent with the seven year WMAP data. The tensor to scalar ratio r is quite small, taking on values r 10 −5 . Due to R-symmetry massless SU (3) octet and SU (2) triplet supermultiplets are present and could spoil gauge coupling unification. To keep gauge coupling unification intact, light vector-like particles are added which are expected to be observed at LHC.

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“…Supersymmetric (SUSY) hybrid inflation [1,2,3,4,5,6] offers a natural setup for linking inflation with grand unified theory (GUT) based particle physics models. This connection is further strengthened in the tribrid inflation framework [7,8,9,10,11,12], an interesting extension of supersymmetric hybrid inflation, where a matter field can be employed to realize inflation.…”

Section: Introductionmentioning

confidence: 99%

“…A pseudosmooth version of tribrid inflation [13] can be employed to avoid the monopole problem, if present. An SU (5) example is discussed in [14]. For a comprehensive discussion of tribrid inflation with gauge non-singlet matter field inflaton, see [15].…”

Section: Introductionmentioning

confidence: 99%

Sneutrino Tribrid Inflation, Metastable Cosmic Strings and Gravitational Waves

Masoud,

Rehman,

Shafi

2021

Preprint

Self Cite

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We present a successful realization of sneutrino tribrid inflation model based on a gauged U (1) B−L extension of Minimal Supersymmetric Standard Model (MSSM). A single interaction term involving the B −L Higgs field and the right-handed neutrinos serves multiple purposes. These include the generation of heavy Majorana masses for the right-handed neutrinos to provide an explanation for the tiny neutrino masses via the seesaw mechanism, a realistic scenario for reheating and non-thermal leptogenesis with a reheat temperature as low as 10 6 GeV, and a successful realization of inflation with right-handed sneutrino as the inflaton. The matter parity which helps avoid rapid proton decay survives as a Z 2 subgroup of a U (1) R-symmetry. Depending on the choice of model parameters yields the following predicted range of the tensor to scalar ratio, 3 × 10 −11 r 7 × 10 −4 (6 × 10 −7 r 0.01), and the running of the scalar spectral index, −0.00022 dn s /d ln k −0.0026 (−0.00014 dn s /d ln k 0.005), along with the B −L breaking scale, 3×10 14 M/GeV 5×10 15 (6×10 15 M/GeV 2 × 10 16 ), calculated at the central value of the scalar spectral index, n s = 0.966, reported by Planck 2018. The possibility of realizing metastable cosmic strings in a grand unified theory setup is briefly discussed. The metastable cosmic string network admits string tension values in the range 10 −8 Gµ s 10 −6 , and predicts a stochastic gravitational wave background lying within the 2-σ bounds of the recent NANOGrav 12.5-yr data.

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Minimal Supersymmetric Hybrid Inflation, Flipped SU(5) and Proton Decay

Cited by 23 publications

References 24 publications

Phase transition and monopole production in supergravity inflation

Phase transition and monopole production in supergravity inflation

Inflation in Supersymmetric SU(5)

Sneutrino Tribrid Inflation, Metastable Cosmic Strings and Gravitational Waves

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