199 citations · 4.2k across the 135 of their papers we have counts for
12 papers · 1 filter
Common Origin of Warm Dark Matter and Dark Radiation
Manuel A. Buen-Abad, Raymond T. Co, Keisuke Harigaya
We consider a cosmological scenario where a relativistic particle and a stable massive particle are simultaneously produced from the decay of a late-decaying particle after Big-Ban…
Natural Twin Neutralino Dark Matter
Marcin Badziak, Giovanni Grilli di Cortona, Keisuke Harigaya
Supersymmetric Twin Higgs models have a discrete symmetry for which each Standard Model particle and its supersymmetric partner have a corresponding state that transforms under a m…
QCD Axion Dark Matter from a Late Time Phase Transition
Keisuke Harigaya, Jacob M. Leedom
We investigate the possibility that the Peccei-Quinn phase transition occurs at a temperature far below the symmetry breaking scale. Low phase transition temperatures are typical i…
Axiogenesis
Raymond T. Co, Keisuke Harigaya
We propose a mechanism called axiogenesis where the cosmological excess of baryons over antibaryons is generated from the rotation of the QCD axion. The Peccei-Quinn (PQ) symmetry…
Dark Matter, Dark Radiation and Gravitational Waves from Mirror Higgs Parity
David Dunsky, Lawrence J. Hall, Keisuke Harigaya
An exact parity replicates the Standard Model giving a Mirror Standard Model, SM SM. This "Higgs Parity" and the mirror electroweak symmetry are spontaneously…
Cosmic perturbations, baryon asymmetry and dark matter from the minimal supersymmetric standard model
Keisuke Harigaya, Masaki Yamada
Scalar fields in the minimal supersymmetric standard model may have large field values during inflation. Because of approximate global symmetry, it is plausible that the phase dire…
Nambu-Goldstone Affleck-Dine Baryogenesis
Keisuke Harigaya
The Affleck-Dine mechanism creates the baryon asymmetry of the universe from an angular motion of a complex scalar field. The mechanism is efficient and allows for a low reheating…
Higgs Parity Grand Unification
Lawrence J. Hall, Keisuke Harigaya
The vanishing of the Higgs quartic coupling of the Standard Model at high energies may be explained by spontaneous breaking of Higgs Parity. Taking Higgs Parity to originate from t…
A Predictive Mirror Twin Higgs with Small Breaking
Keisuke Harigaya, Robert McGehee, Hitoshi Murayama +1
The twin Higgs mechanism is a solution to the little hierarchy problem in which the top partner is neutral under the Standard Model (SM) gauge group. The simplest mirror twin Higgs…
Natural supersymmetric Twin Higgs
Marcin Badziak, Keisuke Harigaya
A new class of supersymmetric Twin Higgs (TH) models where new gauge symmetry is responsible for the TH mechanism is reviewed. In this class of models the Higgs mass is naturally i…
Higgs Parity, Strong CP, and Dark Matter
David Dunsky, Lawrence J. Hall, Keisuke Harigaya
An exact spacetime parity replicates the electroweak interaction, the Higgs boson , and the matter of the Standard Model. This "Higgs Parity" and the mirror…
Dark Matter Production during the Thermalization Era
Keisuke Harigaya, Kyohei Mukaida, Masaki Yamada
We revisit the non-thermal dark matter (DM) production during the thermalization and reheating era after inflation. The decay of inflaton produces high-energy particles that are th…