Power-law inflation with a nonminimally coupled scalar field

Shinji Tsujikawa*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


We consider the dynamics of power-law inflation with a nonminimally coupled scalar field φ. It is well known that multiple scalar fields with exponential potentials V(φ)=V0 exp(-√16π/pmpl2φ) lead to an inflationary solution even if each scalar field is not capable to sustain inflation. In this paper, we show that inflation can be assisted even in the one-field case by the effect of nonminimal coupling. When ξ is positive, since an effective potential which arises by a conformal transformation becomes flatter compared with the case of ξ =0 for φ>0, we have an inflationary solution even when the Universe evolves as noninflationary in the minimally coupled case. For negative ξ, the assisted inflation can take place when φ evolves in the region of φ<0.

Original languageEnglish
Article number043512
Pages (from-to)1-7
Number of pages7
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number4
Publication statusPublished - 2000 Aug 15

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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