TY - JOUR
T1 - Power-law inflation with a nonminimally coupled scalar field
AU - Tsujikawa, Shinji
PY - 2000/8/15
Y1 - 2000/8/15
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=2442663943&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=2442663943&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.62.043512
DO - 10.1103/PhysRevD.62.043512
M3 - Article
AN - SCOPUS:2442663943
VL - 62
SP - 1
EP - 7
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 0556-2821
IS - 4
M1 - 043512
ER -