2016/01/31 by B. Charles Bryant, Stuart Raby · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Electroweak interaction #Geometry #Inflation (cosmology) #Inflaton #Mathematical physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Planck #Quantum mechanics #Scalar (mathematics) #Scalar field #Spectral index #Spectral line #Symmetry breaking #Theoretical physics #hep-ph
paper · pdf · doi:10.1103/physrevd.93.095003
published as Phys. Rev. D 93, 095003 (2016) · 19 pages, 4 figures. v2: typo fixed, figure added, references added; v3: additional typos fixed
arxiv created 2016/02/17 · openalex publication_date 2016/05/04 · arxiv updated 2016/05/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In this paper we present a model of subcritical hybrid inflation with a Pati-Salam (PS) symmetry group. Both the inflaton and waterfall fields contribute to the necessary e-foldings of inflation, while only the waterfall field spontaneously breaks PS hence monopoles produced during inflation are diluted during the inflationary epoch. The model is able to produce a tensor-to-scalar ratio, r<0.09 consistent with the latest BICEP2/Keck and Planck data, as well as scalar density perturbations and spectral index, ns, consistent with Planck data. For particular values of the parameters, we find r=0.084 and ns=0.0963. The energy density during inflation is directly related to the PS breaking scale, vPS. The model also incorporates a ℤ4R symmetry which can resolve the \ensuremathμ problem and suppress dimension 5 operators for proton decay, leaving over an exact R parity. Finally the model allows for a complete three-family extension with a D4 family symmetry which reproduces low energy precision electroweak and LHC data.