Formalizing slow-roll inflation in scalar-tensor theories of gravitation


Akin K., Arapoğlu A. S., Yükselci A. E.

PHYSICS OF THE DARK UNIVERSE, cilt.30, 2020 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 30
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.dark.2020.100691
  • Dergi Adı: PHYSICS OF THE DARK UNIVERSE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, INSPEC
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

The viability of slow-roll approximation is examined by considering the structure of phase spaces in scalar-tensor theories of gravitation and the analysis is exemplified with a nonminimally coupled scalar field to the spacetime curvature. The slow-roll field equations are obtained in the Jordan frame in two ways: first using the direct generalization of the slow-roll conditions in the minimal coupling case to nonminimal one, and second, conformal transforming the slow-roll field equations in the Einstein frame to the Jordan frame and then applying the generalized slow-roll conditions. Two inflationary models governed by the potentials V(phi) alpha phi(2) and V(phi) alpha phi(4) are considered to compare the outcomes of two methods based on the analysis of n(s) and r values in the light of recent observational data. (c) 2020 Elsevier B.V. All rights reserved.