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Qaisar Shafi
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Will Planck Observe Gravity Waves from U(1)_B-L Inflation?
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In this talk I review two classes of realistic
inflationary models based on a local U(1)_B-L
symmetry.
The first class of models exploits supersymmetry
and takes into account
supergravity corrections as well radiative
corrections and the soft
supersymmetry breaking terms. The tensor
to scalar ratio r, a
canonical measure for gravity waves generated
during inflation, lies
in the observable range of Planck (r >~ 0.03)for
suitable choice of parameters. However, r
<< 1 for the minimal supersymmetric inflation
model. The
second class of U(1)_B-L inflation models
is based on a Higgs potential and yields
observable values for r, provided the scalar
spectral index n_s lies
close to 0.96, as determined by the Planck
and WMAP 9 measurements.
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