Induced gravity inflation in the SU(5) GUT
Abstract
We investigate the cosmological consequences of a theory of induced gravity in which the scalar field is identified with the Higgs field of the first symmetry breaking of a minimal SU(5) GUT. The mass of the X boson determines a great value for the coupling constant of of gravityparticle physics. Because of this fact, a ``slow'' rollover dynamics for the Higgs field is not possible in a ``new'' inflation scenario and, moreover, a contraction era for the scale factor in the early Universe exists, after which inflation follows automatically; ``chaotic'' inflation is performed without problems. Inflation is successfully achieved due to the relationship among the masses of particle physics at that scale: the Higgsboson, Xboson, and Planck masses. As a result the particle physics parameter λ is not finetuned as usual in order to predict acceptable values of reheating temperature and density and gravitational wave perturbations. Moreover, if the coherent Higgs oscillations did not decay they could explain the missing mass problem of cosmology.
 Publication:

Physical Review D
 Pub Date:
 January 1995
 DOI:
 10.1103/PhysRevD.51.395
 arXiv:
 arXiv:astroph/9412032
 Bibcode:
 1995PhRvD..51..395C
 Keywords:

 98.80.Cq;
 Particletheory and fieldtheory models of the early Universe;
 Astrophysics;
 General Relativity and Quantum Cosmology
 EPrint:
 19 pages, latex, 6 figures available by request