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From New to Large Field Inflation: Comparison with WMAP3
We briefly summarize and update a class of inflationary models from the early
eighties based on a quartic (Coleman-Weinberg) potential for a gauge singlet
scalar (inflaton) field. For vacuum energy scales comparable to the grand
unification scale, the scalar spectral index n_s=0.94-0.97, in very good
agreement with the WMAP three year results. The tensor to scalar ratio r<~0.14
while alpha=dn_s/d ln k=~-10^-3. For vacuum energy scales >~10^16 GeV, the
inflationary scenario switches from `new' to `large-field' (V\propto\phi^2)
inflation. An SO(10) version naturally explains the observed baryon asymmetry
via non-thermal leptogenesis.Comment: 7 pages, 4 figures, 1 table. Based on a talk given by Q. Shafi at the
2nd International Conference on The Dark Side of the Universe (DSU 2006),
Madrid (Spain), 20-24 June 200
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