115 research outputs found
Inflation With A Realistic SO(10) Model
We implement inflation within a realistic supersymmetric SO(10) model in
which the doublet-triplet splitting is realized through the Dimopoulos-Wilczek
mechanism, the MSSM problem is resolved, and higgsino mediated dimension
five nucleon decay is heavily suppressed. The cosmologically unwanted
topological defects are inflated away, and from , the
breaking scale is estimated to be of order GeV. Including
supergravity corrections, the scalar spectral index , with
|dn_s/ d{\rm ln}k| \lapproxeq 10^{-3}.Comment: 4 pages. Talk presented by B. Kyae at PASCOS'05, Gyeongju, Korea (May
30 - June 4, 2005), at PPP'05, YITP, Kyoto, Japan (June 20-24, 2005), and at
COSMO'05, Bonn, Germany (Aug. 28 - Sept. 1, 2005
Primordial gravitational wave of BICEP2 from dynamical double hybrid inflation
BICEP2 has observed a primordial gravitational wave corresponding to the
tensor-to-scalar ratio of 0.16. It seems to require a super-Planckian
inflationary model. In this paper, we propose a double hybrid inflation model,
where the inflaton potential dynamically changes with the evolution of the
inflaton fields. During the first phase of inflation over 7 e-folds, the power
spectrum can be almost constant by a large linear term in the hybrid potential,
which is responsible also for the large tensor-to-scalar ratio. In the second
phase of 50 e-folds, the dominant potential becomes dynamically changed to the
logarithmic form as in the ordinary supersymmetric hybrid inflation, which is
performed by the second inflaton field. In this model, the sub-Planckian field
values (~0.9 M_P) can still yield the correct cosmic observations with the
sufficient e-folds.Comment: 12 pages, 1 figure, version to appear in Phys. Lett.
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