• SUSY see-saw and NMSO(10)GUT inflation after BICEP2

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      https://www.ias.ac.in/article/fulltext/pram/086/02/0315-0323

    • Keywords

       

      Unified theories; early Universe; SUSY.

    • Abstract

       

      Supersymmetric see-saw slow roll inflection point inflation occurs along a MSSM 𝐷-flat direction associated with gauge invariant combination of Higgs, slepton and right-handed sneutrino at a scale set by the right-handed neutrino mass 𝑀𝜈c ∼ 106−1013 GeV. The tensor to scalar perturbation ratio 𝑟 ∼ 10−3 can be achieved in this scenario. However, this scenario faced difficulty in being embedded in the realistic new minimal supersymmetric SO(10) grand unified theory (NMSO(10)GUT). The recent discovery of B-mode polarization by BICEP2, changes the prospects of NMSO(10)GUT inflation. Inflection point models become strongly disfavoured, as the trilinear coupling of SUSY see-saw inflation potential gets suppressed relative to the mass parameter favoured by BICEP2. Large values of 𝑟 ≈ 0.2 can be achieved with super-Planck scale inflaton values and mass scales of inflaton ≥1013 GeV. In NMSO(10)GUT, this can be made possible with an admixture of heavy Higgs doublet fields, i.e., other than MSSM Higgs field, which are present and have masses of order GUT scale.

    • Author Affiliations

       

      Ila Garg1 2

      1. Department of Physics, Panjab University, Chandigarh 160 014, India
      2. Physical Research Laboratory, Ahmedabad 380 009, India
    • Dates

       
  • Pramana – Journal of Physics | News

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