512 research outputs found
A Dynamic Modification to Sneutrino Chaotic Inflation
We consider a right-handed scalar neutrino as the inflaton which carries a
gravitational coupling with a supersymmetric QCD sector responsible for
breaking supersymmetry dynamically. The framework suggests an inflaton
potential which is a deformed version of the quadratic chaotic inflation
leading to a flatter potential. We find that this deformation results a sizable
tensor to scalar ratio which falls within the allowed region by PLANCK 2015. At
the same time supersymmetry breaking at the end of inflation can naturally be
induced in this set-up. The symmetries required to construct the framework
allows the neutrino masses and mixing to be of right order.Comment: 24 pages, 3 figures; version to appear in JHE
Higgs Vacuum Stability and Modified Chaotic Inflation
The issue of electroweak vacuum stability is studied in presence of a scalar
field which participates in modifying the minimal chaotic inflation model. It
is shown that the threshold effect on the Higgs quartic coupling originating
from the Higgs-inflaton sector interaction can essentially make the electroweak
vacuum stable upto the Planck scale. On the other hand we observe that the new
physics parameters in this combined framework are enough to provide deviation
from the minimal chaotic inflation predictions so as to keep it consistent with
recent observation by Planck 2015.Comment: 17 pages, 7 figure
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