Plateau inflation in SUGRA-MSSM

Chakravarty, Girish Kumar; Gupta, Gaveshna; Lambiase, Gaetano; Mohanty, Sanghamitra

doi:10.1016/j.physletb.2016.06.053

Cited by 13 publications

(14 citation statements)

References 30 publications

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“…In the early universe the no-scale Kähler potential gives the plateau inflation from supergravity (SUGRA) [6,7,9,63,64] which fits the requirements of the observed low tensor-to-scalar ratio and the temperature anisotropy. We consider the most economical SUSY model, namely the MSSM but allow R-parity violation.…”

Section: The Modelmentioning

confidence: 53%

“…Plateau inflation in MSSM with a D-flat combination of Higgs fields has been studied in [9]. In this paper we show that plateau inflation can be achieved in the Rparity violating MSSM where the TeV scale sneutrino and charged slepton masses can give testable LHC prediction like a diphoton resonance with significant cross section (σ pp→φ→γγ ∼ 10 fb).…”

Section: Discussionmentioning

confidence: 76%

“…There are atleast two experimental sectors which hint at the existence of scalar fields beyond the Higgs field of the Standard Model (SM). In order to explain the observed anisotropy of the cosmic microwave background (CMB) temperature at the super horizon scales [1] and at the same time the low value of the tensor-to-scalar ratio r < 0.07 [1,2] one requires an inflaton field with a plateau potential [3][4][5][6][7][8][9]. The other hint for a scalar field is the 750 GeV diphoton excess which may have been observed by ATLAS [10] and CMS [11] collaborations which has launched a large number of models which explain the 750 GeV diphoton resonance in the context of left-right models [12][13][14][15][16][17][18][19], Grand Unification [20][21][22] and supersymmetry (SUSY) [23][24][25][26][27][28] and other exotic models (reviewed in [29,30]).…”

Section: Introductionmentioning

confidence: 99%

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Plateau inflation in R-parity violating MSSM

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Inflation with plateau potentials give the best fit to the CMB observables as they predict tensor to scalar ratio stringently bounded by the observations from Planck and BICEP2/Keck. In supergravity models it is possible to obtain plateau potentials for scalar fields in the Einstein frame which can serve as the inflation potential by considering higher dimensional Planck suppressed operators and by the choice of non-canonical Kähler potentials. We construct a plateau inflation model in MSSM where the inflation occurs along a sneutrino-Higgs flat direction. A hidden sector Polonyi field is used for the breaking of supersymmetry after the end of the inflation. The proper choice of superpotential leads to strong stabilization of the Polonyi field, m 2 Z m 2 3/2 , which is required to solve the cosmological moduli problem. Also, the SUSY breaking results in a TeV scale gravitino mass and scalar masses and gives rise to bilinear and triliear couplings of scalars which can be tested at the LHC. The sneutrino inflation field can be observed at the LHC as a TeV scale diphoton resonance like the one reported by CMS and ATLAS.

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Section: The Modelmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

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Plateau inflation in R-parity violating MSSM

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“…The potential in NMSSM however has a tachyonic instability in the direction orthogonal to the slow-roll [108]. This instability can be cured by the addition of quartic terms of the fields in the Kähler potential [109,110] (see also [111]). In the context of a SUGRA embedding of the Starobinsky model, it was shown that quadratic Ricci curvature terms can be derived in SUGRA by adding two chiral superfields in the minimal SUGRA [112].…”

Section: Power Law Starobinsky Model From No-scale Sugramentioning

confidence: 99%

Testing theories of gravity and supergravity with inflation and observations of the cosmic microwave background

Chakravarty

Mohanty

Lambiase

2017

Int. J. Mod. Phys. D

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Abstract. Cosmological and astrophysical observations lead to the emerging picture of a universe that is spatially flat and presently undertaking an accelerated expansion. The observations supporting this picture come from a range of measurements encompassing estimates of galaxy cluster masses, the Hubble diagram derived from type-Ia supernovae observations, the measurements of Cosmic Microwave Background radiation anisotropies, etc. The present accelerated expansion of the universe can be explained by admitting the existence of a cosmic fluid, with negative pressure. In the simplest scenario this unknown component of the universe, the Dark Energy, is represented by the cosmological constant (Λ), and accounts for about 70% of the global energy budget of the universe. The remaining 30% consists of a small fraction of baryons (4%) with the rest cold Dark Matter (CDM). The Lambda Cold Dark Matter (ΛCDM) model, i.e. General Relativity with cosmological constant, is in good agreement with observations. It can be assumed as the first step towards a new standard cosmological model. However, despite the satisfying agreement with observations, the ΛCDM model presents several lacks of congruence and shortcomings, and therefore theories beyond Einsteins General Relativity are called for. Many extensions of Einstein's theory of gravity have been studied and proposed with various motivations like the quest for a quantum theory of gravity to extensions of anomalies in observations at the solar system, galactic and cosmological scales. These extensions include adding higher powers of Ricci curvature R, coupling the Ricci curvature with scalar fields and generalized functions of R. In addition when viewed from the perspective of Supergravity (SUGRA) many of these theories may originate from the same SUGRA theory, but interpreted in different frames. SUGRA therefore serves as a good framework for organizing and generalizing theories of gravity beyond General Relativity. All these theories when applied to inflation (a rapid expansion of early Universe in which primordial gravitational waves might be generated and might still be detectable by the imprint they left or by the ripples that persist today) can have distinct signatures in the Cosmic Microwave Background radiation temperature and polarization anisotropies. We give a review of ΛCDM cosmology and survey the theories of gravity beyond Einsteins General Relativity, specially which arise from SUGRA, and study the consequences of these theories in the context of inflation and put bounds on the theories and the parameters therein from the observational experiments like PLANCK, Keck/BICEP etc. The possibility of testing these theories in the near future in CMB observations and new data coming from colliders like the LHC, provides an unique opportunity for constructing verifiable models of particle physics and General Relativity.

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“…The family is parameterised by two real parameters, 1 This should not be confused with plateau inflation in Ref. [9].…”

Section: Introductionmentioning

confidence: 99%

Modelling inflation with a power-law approach to the inflationary plateau

Dimopoulos

Owen

2016

Phys. Rev. D

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A new family of inflationary models is introduced and analysed. The behaviour of the parameters characterising the models suggest preferred values, which generate the most interesting testable predictions. Results are further improved if late reheating and/or a subsequent period of thermal inflation is taken into account. Specific model realisations consider a subPlanckian inflaton variation or a potential without fine-tuning of mass scales, based on the Planck and grand unified theory scales. A toy model realisation in the context of global and local supersymmetry is examined and results fitting the Planck observations are determined.

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Plateau inflation in SUGRA-MSSM

Cited by 13 publications

References 30 publications

Plateau inflation in R-parity violating MSSM

Plateau inflation in R-parity violating MSSM

Testing theories of gravity and supergravity with inflation and observations of the cosmic microwave background

Modelling inflation with a power-law approach to the inflationary plateau

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