Soft inflation
Abstract
We study the cosmology resulting from two coupled scalar fields, one which is either a new or chaotictype inflaton and another which has an exponentially decaying potential. Such a potential may appear in the conformally transformed frame of generalized Einstein theories such as the JordanBransDicke theory. The constraints necessary for successful inflation are examined. We find conventional grand unified theory models such as SU(5) are compatible with new inflation, while restrictions on the selfcoupling constant are significantly loosened for chaotic inflation.
 Publication:

Physical Review Letters
 Pub Date:
 July 1990
 DOI:
 10.1103/PhysRevLett.65.141
 Bibcode:
 1990PhRvL..65..141B
 Keywords:

 Bubbles;
 Cosmology;
 Mathematical Models;
 Scalars;
 Stellar Evolution;
 Chaos;
 Einstein Equations;
 String Theory;
 Universe;
 Astrophysics;
 98.80.Cq;
 04.50.+h;
 Particletheory and fieldtheory models of the early Universe;
 Gravity in more than four dimensions KaluzaKlein theory unified field theories;
 alternative theories of gravity