199 citations · 4.2k across the 135 of their papers we have counts for
8 papers · 1 filter
New Inflation in the Landscape and Typicality of the Observed Cosmic Perturbation
Chien-I Chiang, Keisuke Harigaya
We investigate if the observed small and nearly scale-invariant primordial cosmic perturbation, i.e. the perturbation amplitude and the spectral index $n_s \simeq…
Axion Misalignment Driven to the Hilltop
Raymond T. Co, Eric Gonzalez, Keisuke Harigaya
The QCD axion serves as a well-motivated dark matter candidate and the misalignment mechanism is known to reproduce the observed abundance with a decay constant $f_a \simeq \mathca…
Axion Misalignment Driven to the Bottom
Raymond T. Co, Eric Gonzalez, Keisuke Harigaya
Several theoretical motivations point to ultralight QCD axions with large decay constants GeV, to which experimental proposals are dedicat…
CHAMP Cosmic Rays
David Dunsky, Lawrence J. Hall, Keisuke Harigaya
We study interactions of cosmological relics, , of mass and electric charge in the galaxy, including thermalization with the interstellar medium, diffusion through inho…
Parametric Resonance Production of Ultralight Vector Dark Matter
Jeff A. Dror, Keisuke Harigaya, Vijay Narayan
Vector bosons heavier than eV can be viable dark matter candidates with distinctive experimental signatures. Ultralight dark matter generally requires a non-thermal orig…
Impact of an extra gauge interaction on naturalness of supersymmetry
Marcin Badziak, Keisuke Harigaya
It is pointed out that in supersymmetric models with a new gauge symmetry under which the Higgs is charged, the fine-tuning of the electroweak symmetry breaking is relaxed due to s…
Implications of Higgs Discovery for the Strong CP Problem and Unification
Lawrence J. Hall, Keisuke Harigaya
A symmetry that extends the weak interaction, , and the Higgs sector, , yields a Standard Model…
QCD axion dark matter from long-lived domain walls during matter domination
Keisuke Harigaya, Masahiro Kawasaki
The domain wall problem of the Peccei-Quinn mechanism can be solved if the Peccei-Quinn symmetry is explicitly broken by a small amount. Domain walls decay into axions, which may a…