9,765 research outputs found
Asymptotically Safe Higgs Inflation
We construct a new inflation model in which the standard model Higgs boson
couples minimally to gravity and acts as the inflaton. Our construction of
Higgs inflation incorporates the standard model with Einstein gravity which
exhibits asymptotic safety in the ultraviolet region. The slow roll condition
is satisfied at large field value due to the asymptotically safe behavior of
Higgs self-coupling at high energies. We find that this minimal construction is
highly predictive, and is consistent with both cosmological observations and
collider experiments.Comment: 16pp, to match JCAP Final Version, only minor refinements, references
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Extending Higgs Inflation with TeV Scale New Physics
Higgs inflation is among the most economical and predictive inflation models,
although the original Higgs inflation requires tuning the Higgs or top mass
away from its current experimental value by more than deviations, and
generally gives a negligible tensor-to-scalar ratio (if away
from the vicinity of critical point). In this work, we construct a minimal
extension of Higgs inflation, by adding only two new weak-singlet particles at
TeV scale, a vector-quark and a real scalar . The presence of singlets
significantly impact the renormalization group running of the Higgs
boson self-coupling. With this, our model provides a wider range of the
tensor-to-scalar ratio , consistent with the favored
values by either BICEP2 or Planck data, while keeping the successful prediction
of the spectral index . It further allows the Higgs and top
masses to fully fit the collider measurements. We also discuss implications for
searching the predicted TeV-scale vector-quark and scalar at the LHC
and future high energy pp colliders.Comment: 20pp, to match JCAP Final Versio
Spontaneous Spacetime Reduction and Unitary Weak Boson Scattering at the LHC
Theories of quantum gravity predict spacetime dimensions to become reduced at
high energies, a striking phenomenon known as spontaneous dimensional reduction
(SDR). We construct an effective electroweak theory based on the standard model
(SM) and incorporate the TeV-scale SDR, which exhibits good high energy
behavior and ensures the unitarity of weak gauge boson scattering. This also
provides a natural solution to the hierarchy problem in the presence of scalar
Higgs boson. We demonstrate that this model predicts unitary longitudinal weak
boson scattering, and can be discriminated from the conventional 4d SM by the
WW scattering experiments at the CERN LHC.Comment: Phys. Lett. B (in Press). arXiv admin note: text overlap with
arXiv:1112.102
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