8 research outputs found
Higgs Inflation at the Pole
We propose a novel possibility for Higgs inflation where the perturbative
unitarity below the Planck scale is ensured by construction and the successful
predictions for inflation are accommodated. The conformal gravity coupling for
the Higgs field leads to the proximity of the effective Planck mass to zero in
the Jordan frame during inflation, corresponding to a pole in the Higgs kinetic
term in the Einstein frame. Requiring the Higgs potential to vanish at the
conformal pole in the effective theory in the Jordan frame, we make a robust
prediction of the successful Higgs inflation. We show that a concrete
realization of the Higgs pole inflation can be pinned down by the reheating
processes with a general equation of state for the Higgs inflaton. We
illustrate some extensions of the simple Higgs pole inflation to the general
pole expansions, the running Higgs quartic coupling in the Standard Model and
its extension with a singlet scalar field, a supergravity embedding of the
Higgs pole inflation.Comment: 23 pages, 3 figure
The lepton portals for muon , boson mass and dark matter
We propose a novel model for lepton flavor and dark matter based on the
gauge symmetry and vector-like leptons in its fundamental
representations. We introduce a dark Higgs doublet and a Higgs
bi-doublet for the mass mixing between the vector-like lepton and the lepton.
As a result, the seesaw lepton masses are generated and there are sizable
one-loop contributions to the muon via the gauge bosons and the
relatively heavy vector-like lepton, as indicated in Fermilab E989. The
tree-level mass mixing between the boson and the isospin neutral gauge
boson of in our model accounts for the shift in the boson mass,
being consistent with Tevatron CDFII. Finally, we show that the isospin charged
gauge boson of becomes a plausible candidate for dark matter with a
small mass splitting tied up to the modified boson mass, and there is a
viable parameter space where the favored corrections to the muon and the
boson mass and the dark matter constraints are simultaneously fulfilled.Comment: 33 pages, 4 figures, v2: references added, v3: version to appear in
Phys. Rev.
Peccei-Quinn Inflation at the Pole and Axion Kinetic Misalignment
We propose a minimal extension of the Standard Model with the Peccei-Quinn
(PQ) scalar field and explain the relic density of the QCD axion through the
kinetic misalignment with a relatively small axion decay constant. To this
purpose, we consider a slow-roll inflation from the radial component of the PQ
field with the PQ conserving potential near the pole of its kinetic term and
investigate the post-inflationary dynamics of the PQ field for reheating. The
angular mode of the PQ field, identified with the QCD axion, receives a nonzero
velocity during inflation due to the PQ violating potential, evolving with an
approximately conserved Noether PQ charge. We determine the reheating
temperature from the perturbative decays and scattering processes of the
inflaton and obtain dark radiation from the axions produced from the inflaton
scattering at a testable level in the future Cosmic Microwave Background
experiments. We show the correlation between the reheating temperature, the
initial velocity of the axion and the axion decay constant, realizing the axion
kinetic misalignment for the correct relic density.Comment: 25 pagesm 3 figure
Higgs inflation at the pole
Abstract We propose a novel possibility for Higgs inflation where the perturbative unitarity below the Planck scale is ensured by construction and the successful predictions for inflation are accommodated. The conformal gravity coupling for the Higgs field leads to the proximity of the effective Planck mass to zero in the Jordan frame during inflation, corresponding to a pole in the Higgs kinetic term in the Einstein frame. Requiring the Higgs potential to vanish at the conformal pole in the effective theory in the Jordan frame, we make a robust prediction of the successful Higgs inflation. For a successful Higgs inflation at the pole, we take the running quartic coupling for the Higgs field to be small enough at the inflation scale, being consistent with the low-energy data, but we need a nontrivial extension of the SM with extra scalar or gauge fields in order to keep the running Higgs quartic coupling small during inflation. Performing the perturbative analysis of reheating with the known couplings of the SM particles to the Higgs boson, we show that a concrete realization of the Higgs pole inflation can be pinned down by the reheating processes with a general equation of state for the Higgs inflaton. We illustrate some extensions of the simple Higgs pole inflation to the general pole expansions, the running Higgs quartic coupling in the Standard Model and its extension with a singlet scalar field, a supergravity embedding of the Higgs pole inflation
Higgs Inflation at the Pole
International audienceWe propose a novel possibility for Higgs inflation where the perturbative unitarity below the Planck scale is ensured by construction and the successful predictions for inflation are accommodated. The conformal gravity coupling for the Higgs field leads to the proximity of the effective Planck mass to zero in the Jordan frame during inflation, corresponding to a pole in the Higgs kinetic term in the Einstein frame. Requiring the Higgs potential to vanish at the conformal pole in the effective theory in the Jordan frame, we make a robust prediction of the successful Higgs inflation. We show that a concrete realization of the Higgs pole inflation can be pinned down by the reheating processes with a general equation of state for the Higgs inflaton. We illustrate some extensions of the simple Higgs pole inflation to the general pole expansions, the running Higgs quartic coupling in the Standard Model and its extension with a singlet scalar field, a supergravity embedding of the Higgs pole inflation
Reheating and Dark Matter Freeze-in in the Higgs- Inflation Model
We study the post-inflationary dynamics for reheating and freeze-in dark
matter in the Higgs- inflation model. Taking the perturbative approach for
reheating, we determine the evolution of the temperature for radiation bath
produced during reheating and determine the maximum and reheating temperatures
of the Universe. Adopting a singlet scalar dark matter with a conformal
non-minimal coupling and a vanishing Higgs-portal coupling, we discuss the
freeze-in production of dark matter both from the non-thermal scattering during
reheating and the thermal scattering after reheating. We find that thermal
scattering is dominant for dark matter production in our model due to the high
reheating temperature. The reheating temperature in our model is determined
dominantly by the Higgs condensate to be up to about and
dark matter with masses up to about can be produced with a
correct relic density.Comment: 39 pages,7 figures; v2 Published version in JHE
Peccei-Quinn Inflation at the Pole and Axion Kinetic Misalignment
We propose a minimal extension of the Standard Model with the Peccei-Quinn (PQ) scalar field and explain the relic density of the QCD axion through the kinetic misalignment with a relatively small axion decay constant. To this purpose, we consider a slow-roll inflation from the radial component of the PQ field with the PQ conserving potential near the pole of its kinetic term and investigate the post-inflationary dynamics of the PQ field for reheating. The angular mode of the PQ field, identified with the QCD axion, receives a nonzero velocity during inflation due to the PQ violating potential, evolving with an approximately conserved Noether PQ charge. We determine the reheating temperature from the perturbative decays and scattering processes of the inflaton and obtain dark radiation from the axions produced from the inflaton scattering at a testable level in the future Cosmic Microwave Background experiments. We show the correlation between the reheating temperature, the initial velocity of the axion and the axion decay constant, realizing the axion kinetic misalignment for the correct relic density.We propose a minimal extension of the Standard Model with the Peccei-Quinn (PQ) scalar field and explain the relic density of the QCD axion through the kinetic misalignment with a relatively small axion decay constant. To this purpose, we consider a slow-roll inflation from the radial component of the PQ field with the PQ conserving potential near the pole of its kinetic term and investigate the post-inflationary dynamics of the PQ field for reheating. The angular mode of the PQ field, identified with the QCD axion, receives a nonzero velocity during inflation due to the PQ violating potential, evolving with an approximately conserved Noether PQ charge. We determine the reheating temperature from the perturbative decays and scattering processes of the inflaton and obtain dark radiation from the axions produced from the inflaton scattering at a testable level in the future Cosmic Microwave Background experiments. We show the correlation between the reheating temperature, the initial velocity of the axion and the axion decay constant, realizing the axion kinetic misalignment for the correct relic density