Inflationary predictions of double-well, Coleman-Weinberg, and hilltop potentials with non-minimal coupling

Bostan N., Guleryuz Ö., Senoguz V. N.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, sa.5, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: Sayı: 5
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1088/1475-7516/2018/05/046
  • Dergi Adı: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: inflation, physics of the early universe, BROKEN-SYMMETRIC THEORY, RUNNING SPECTRAL INDEX, SCALAR FIELD, INDUCED-GRAVITY, SUPERGRAVITY, BREAKING, UNIVERSE, PERTURBATIONS, SCENARIO, FLATNESS
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

We discuss how the non-minimal coupling xi phi(2) R between the inflaton and the Ricci scalar affects the predictions of single field inflation models where the inflaton has a non-zero vacuum expectation value (VEV) v after inflation. We show that, for inflaton values both above the VEV and below the VEV during inflation, under certain conditions the inflationary predictions become approximately the same as the predictions of the Starobinsky model. We then analyze inflation with double-well and Coleman-Weinberg potentials in detail, displaying the regions in the v-xi plane for which the spectral index n(s) and the tensor-to-scalar ratio r values are compatible with the current observations. r is always larger than 0.002 in these regions. Finally, we consider the effect of xi on small field inflation (hilltop) potentials.