3 papers
gr-qc1994
Nontrivial Dynamics in the Early Stages of Inflation
E. Calzetta, C. El Hasi
Inflationary cosmologies, regarded as dynamical systems, have rather simple asymptotic behavior, insofar as the cosmic baldness principle holds. Nevertheless, in the early stages o…
gr-qc1992
Chaotic Friedmann-Robertson-Walker Cosmology
E. Calzetta, C. El Hasi
We show that the dynamics of a spatially closed Friedmann - Robertson - Walker Universe conformally coupled to a real, free, massive scalar field, is chaotic, for large enough fiel…
gr-qc1992
Semiclassical Effects and the Onset of Inflation
E. Calzetta, M. Sakellariadou
We present a class of exact solutions to the constraint equations of General Relativity coupled to a Klein - Gordon field, these solutions being isotropic but not homogeneous. We a…