186 research outputs found
TeV scale seesaw from supersymmetric Higgs-lepton inflation and BICEP2
We discuss the physics resulting from the supersymmetric Higgs-lepton
inflation model and the recent CMB B-mode observation by the BICEP2 experiment.
The tensor-to-scalar ratio r=0.20+0.07-0.05 of the primordial fluctuations
indicated by the CMB B-mode polarization is consistent with the prediction of
this inflationary model for natural parameter values. A salient feature of the
model is that it predicts the seesaw mass scale M from the amplitude of the
tensor mode fluctuations. It is found that the 68% (95%) confidence level (CL)
constraints from the BICEP2 experiment give 927 GeV < M < 1.62 TeV (751 GeV < M
< 2.37 TeV) for 50 e-foldings and 391 GeV < M < 795 GeV (355 GeV < M < 1.10
TeV) for 60 e-foldings. In the type I seesaw case, the right-handed neutrinos
in this mass range are elusive in collider experiments due to the small mixing
angle. In the type III seesaw, in contrast, the heavy leptons will be within
the reach of future experiments. We point out that a significant portion of the
parameter region corresponding to the 68% CL of the BICEP2 experiment will be
covered by the Large Hadron Collider experiments at 14 TeV.Comment: 6 pages, 1 figure. v2: a reference added. v3: typos fixe
BPS Vortices in Non-relativistic M2-brane Chern-Simons-matter Theory
We study BPS vortices in the mass-deformed non-relativistic {\C N}=6
Chern-Simons-matter theory. We focus on the massive
deformation that preserves the maximal {\C N}=6 supersymmetry, and consider a
non-relativistic limit that carry 14 supercharges. In this non-relativistic
field theory we find Jackiw-Pi type exact vortex solutions combined with
fuzzy sphere geometry. We analyse their properties and show that they preserve
one dynamical, one conformal and five kinematical supersymmetries among the
full super Schr\"odinger symmetry.Comment: 22 pages, 3 figures, typos corrected, reference adde
Reheating of the Universe as holographic thermalization
Assuming gauge/gravity correspondence we study reheating of the Universe
using its holographic dual. Inflaton decay and thermalisation of the decay
products correspond to collapse of a spherical shell and formation of a
blackhole in the dual anti-de Sitter (AdS) spacetime. The reheating temperature
is computed as the Hawking temperature of the developed blackhole probed by a
dynamical boundary, and is determined by the inflaton energy density and the
AdS radius, with corrections from the dynamics of the shell collapse. For given
initial energy density of the inflaton field the holographic model gives
significantly lower reheating temperature than the instant reheating scenario,
while it is shown to be safely within phenomenological bounds.Comment: 5 pages, 1 figur
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