Simplified smooth hybrid inflation in supersymmetric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mi>U</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>5</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>

Rehman, Mansoor Ur; Zubair, Umer

doi:10.1103/physrevd.91.103523

Cited by 12 publications

(5 citation statements)

References 30 publications

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Section: Large R Solutions and Split Scale Susymentioning

confidence: 86%

“…It has been observed (see for example [23,24,25]), that a red tilted scalar spectral index (n s < 1), consistent with the Planck bounds cannot be achieved with the minimal Kähler potential. In the present work we show for the first time that, by taking soft SUSY contribution into account along with the supergravity (SUGRA) corrections in a minimal Kähler potential setup, the predictions of smooth hybrid inflation model are consistent with the Planck's latest bounds on scalar spectral index n s .…”

Section: Introductionmentioning

confidence: 88%

“…It is worth comparing the obtained results with SU (5) smooth hybrid inflation model [25]. Note that in the limit (σ χ → 0, µ χ → 0), the above model reduces to the smooth SU (5) hybrid inflation model [25]. With the minimal Kähler potential, the smooth SU (5) model requires trans-Planckian field values to obtain n s and r within Planck's data bounds while, in the above model, both n s and r are easily obtained within Planck's data bounds with sub-Planckian field values.…”

Section: Large R Solutions and Split Scale Susymentioning

confidence: 99%

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Smooth Hybrid Inflation with Low Reheat Temperature and Observable Gravity Waves in $SU(5) \times U(1)_χ$ Super-GUT

Ahmed,

Karozas,

Leontaris

et al. 2022

Preprint

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We realize smooth hybrid inflation in the framework of supersymmetric SU (5) × U (1) χ ⊂ SO(10) model which provides a natural solution to the monopole problem appearing in the spontaneous symmetry breaking of SU (5). The breaking of U (1) χ symmetry leaves a residual discrete Z 2 symmetry, that serves as the MSSM matter parity, realizing the possibility of the lightest supersymmetric particle as a cold dark matter candidate. The d = 5 proton lifetime for the decay p → K + ν, mediated by color-triplet Higgsinos is found to satisfy current experimental bounds if split-high scale SUSY scenario is employed. We show that with minimal Kähler potential, the soft supersymmetry breaking terms play a vital rôle in bringing the scalar spectral index n s within the Planck's latest bounds. In a minimal Kähler potential setup, small

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Section: Large R Solutions and Split Scale Susymentioning

confidence: 86%

Section: Introductionmentioning

confidence: 88%

Section: Large R Solutions and Split Scale Susymentioning

confidence: 99%

See 1 more Smart Citation

Smooth Hybrid Inflation with Low Reheat Temperature and Observable Gravity Waves in $SU(5) \times U(1)_χ$ Super-GUT

Ahmed,

Karozas,

Leontaris

et al. 2022

Preprint

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“…To circumvent the problem one may use non-minimal Kähler potential as suggested in [20] to bring back the value of n s within the desired range. On the other hand, to increase r to a detectable limit, further modification in Kähler potential may be required, as shown in [17,19].…”

Section: Inflationary Predictionsmentioning

confidence: 99%

“…Hence a salient feature of such SQCD-embedded inflation model lies in the existence of a UV completion of the theory. Although in its original form the framework of smooth hybrid inflation embedded in supergravity is not consistent with all observational constraints, this can be corrected by considering a modified Kähler potential as shown in [17][18][19][20].…”

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confidence: 99%

Dark matter as a remnant of SQCD inflation

Bhattacharya

Saha

Sil

et al. 2018

J. High Energ. Phys.

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We propose a strongly coupled supersymmetric gauge theory that can accommodate both the inflation (in the form of generalized hybrid inflation) and dark matter (DM).In this set-up, we identify the DM as the Goldstones associated with the breaking of a global symmetry (SU (4) × SU (4) → SU (4)) after inflation ends. Due to the non-abelian nature of this symmetry, the scenario provides with multiple DMs. We then construct a low energy theory which generates a Higgs portal like coupling of the DMs with Standard Model (SM), thus allowing them to thermally freeze out. While the scales involved in the inflation either have a dynamical origin or related to UV interpretation in terms of a heavy quark field in the supersymmetric QCD (SQCD) sector, the DM masses however are generated from explicit breaking of the chiral symmetry of the SQCD sector. We discuss DM phenomenology for both degenerate and non-degenerate cases, poised with DM-DM interactions and find allowed region of parameter space in terms of relic density and direct search constraints. IntroductionAmidst the great success of the Standard Model (SM) of particle physics, there are several intriguing issues which indicate that the SM should be extended or supplemented by some other sector (including new fields and/or gauge symmetry) in order to provide a more complete description of nature. In particular, SM fails to accommodate a large share of energy density of the universe (25%), called dark matter (DM). On the other hand, the idea of primordial inflation serves as an elegant construction which can actually resolve some of the intricate problems (e.g horizon and flatness problems) of otherwise quite successful Big Bang cosmology. This inflationary hypothesis is further strengthened by its prediction on the primordial perturbation that leads to striking agreements with the observation of the cosmic microwave background radiation (CMBR) spectrum. However, SM alone can not be responsible for such 1 subhaditya@iitg.ac.in 2 abhijit.saha@iitg.ac.in 3 asil@iitg.ac.in

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Observable r, gravitino dark matter, and non-thermal leptogenesis in no-scale supergravity

Ahmed

Muhammad

Munir

et al. 2023

J. High Energ. Phys.

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We analyse the shifted hybrid inflation in a no-scale supersymmetric SU(5) GUT model which naturally circumvents the monopole problem. The no-scale framework is derivable as the effective field theory of the supersymmetric (SUSY) compactifications of string theory, and yields a flat potential with no anti-de Sitter vacua, resolving the η problem. The model predicts a scalar spectral tilt ns compatible with the most recent measurements by the Planck satellite, while also accommodating large values of the tensor-to-scalar ratio r (~ 0.0015), potentially measurable by the near-future experiments. Moreover, the proton decay lifetime in the presence of the dimension-5 operators is found to lie above the current limit imposed by the Super-Kamiokande experiment. A realistic scenario of reheating and non-thermal leptogenesis is employed, wherein the reheating temperature Tr lies in the (2 × 106 ≲ Tr ≲ 2 × 109) GeV range, and at the same time realizing gravitino as a viable dark matter (DM) candidate.

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Simplified smooth hybrid inflation in supersymmetricSU(5)

Cited by 12 publications

References 30 publications

Smooth Hybrid Inflation with Low Reheat Temperature and Observable Gravity Waves in $SU(5) \times U(1)_χ$ Super-GUT

Smooth Hybrid Inflation with Low Reheat Temperature and Observable Gravity Waves in $SU(5) \times U(1)_χ$ Super-GUT

Dark matter as a remnant of SQCD inflation

Observable r, gravitino dark matter, and non-thermal leptogenesis in no-scale supergravity

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