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Setting Limits on Supersymmetry Using Simplified Models
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A microscopic model for inflation from supersymmetry breaking.

I Antoniadis1,2, A Chatrabhuti3, H Isono3

  • 1Laboratoire de Physique Théorique et Hautes Energies-LPTHE, Sorbonne Université, CNRS, 4 Place Jussieu, 75005 Paris, France.

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|August 13, 2019
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We present a new framework for cosmic inflation using supersymmetry breaking. This model offers solutions to supergravity inflation problems, enabling a tuneable vacuum energy consistent with cosmological observations.

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Area of Science:

  • Cosmology
  • Particle Physics
  • Supersymmetry

Background:

  • Supergravity inflation models face challenges like large slow-roll parameters and problematic scalar companions.
  • Existing models struggle to naturally incorporate a tuneable cosmological constant at a nearby minimum.

Purpose of the Study:

  • To propose a new framework for inflation driven by supersymmetry breaking.
  • To address limitations of current supergravity inflation models.
  • To provide a microscopic model for a previously proposed effective theory.

Main Methods:

  • Developed an effective field theory based on a chiral multiplet under a gauged R-symmetry.
  • Introduced phenomenological parameters for Kähler potential corrections.
  • Constructed a microscopic Fayet-Iliopoulos model coupled to supergravity.

Main Results:

  • The proposed framework naturally yields small slow-roll parameters and small field initial conditions.
  • Absence of a problematic (pseudo)scalar companion for the inflaton.
  • Achieved a tuneable vacuum energy and a stable minimum.

Conclusions:

  • The microscopic model successfully realizes the effective theory for small-field inflation.
  • The model is consistent with observational data and allows for a tuneable vacuum energy to describe the current cosmic phase.