K. Harigaya

Gravitational Waves and Nambu-Goldstone Bosons from Infrared-Finite Cosmic Strings

Hajime Fukuda, Shuailiang Ge, Keisuke Harigaya

Skyrmion lines and semi-local strings are examples of infrared-finite cosmic strings that arise in theories with spontaneously broken global symmetries. Unlike global $U (1)$ string…

TeV-scale leptogenesis in a parity symmetric neutrino mass model

Keisuke Harigaya, Gio Leone

We study leptogenesis via out-of-equilibrium decays of right-handed neutrinos in a parity symmetric extension of the Standard Model with gauge group $SU(3)_c \times SU(2)_L \times…

Accidentally Stable Dark Matter in a Parity Solution to the Strong CP Problem

Matthew J. Baldwin, Keisuke Harigaya, Isaac R. Wang

Parity symmetry, with an extended gauge group $S U (3)_{c} \times S U (2)_{L} \times S U (2)_{R} \times U (1)_{X}$ , can solve the strong CP problem. In particular, the model where $SU(2)_R\times…

Accidental Peccei-Quinn Symmetry from Chiral Gauge Symmetry and Mirror QCD

Hajime Fukuda, Keisuke Harigaya

We present a solution to the strong CP problem in which a simple chiral U(1) gauge symmetry gives rise to an accidental Peccei-Quinn symmetry that is both explicitly and spontaneou…

hep-ph2025

Electroweak symmetry non-restoration and suppressed dark radiation in Supersymmetric Twin Higgs model

Marcin Badziak, Keisuke Harigaya, Ignacy Nałęcz

We investigate a possibility of electroweak symmetry non-restoration (SNR) below the Twin electroweak scale ( $\sim$ TeV) within the Twin Higgs model. We focus on supersymmetric exte…

hep-ph2025

Upper Bound on Parity Breaking Scale for Doublet WIMP Dark Matter

Matthew J. Baldwin, Keisuke Harigaya, Isaac R. Wang

We consider weakly interacting massive particle (WIMP) dark matter in a Parity solution to the strong CP problem. The WIMP phenomenology can be drastically affected by the presence…

hep-ph2025

A Flavor of SO(10) Unification with a Spinor Higgs

Juanca Carrasco-Martinez, Lawrence J. Hall, Keisuke Harigaya +1

We investigate Higgs Parity Unification-a realization of $S O (10)$ grand unification based on the Higgs Parity mechanism in which the Standard Model (SM) Higgs resides in a spinor r…

Stability of Superconducting Strings

Keisuke Harigaya, Xuce Niu, Wei Xue +1

We investigate the stability of superconducting strings as bound states of strings and fermion zero modes at both the classical and quantum levels. The dynamics of these supercondu…

Solving the strong CP problem with massless grand-color quarks

Ravneet Bedi, Tony Gherghetta, Keisuke Harigaya

We propose a solution to the strong CP problem that specifically relies on massless quarks and has no light axion. The QCD color group $S U (3)_{c}$ is embedded into a larger, simple g…

Electroweak-Charged Dark Matter and SO(10) Unification with Parity

Matthew J. Baldwin, Keisuke Harigaya

We consider electroweak-charged dark matter in an $S O (10)$ unified theory that solves the strong $C P$ problem via Parity. Electroweak-charged dark matter has a colored $S O (10)$ par…

Axion baryogenesis puts a new spin on the Hubble tension

Raymond T. Co, Nicolas Fernandez, Akshay Ghalsasi +2

We show that a rotating axion field that makes a transition from a matter-like equation of state to a kination-like equation of state around the epoch of recombination can signific…

Thermal production of astrophobic axions

Marcin Badziak, Keisuke Harigaya, Michał Łukawski +1

Hot axions are produced in the early Universe via their interactions with Standard Model particles, contributing to dark radiation commonly parameterized as $Δ N_{eff}$ . In s…

Lepto-axiogenesis with light right-handed neutrinos

Patrick Barnes, Raymond T. Co, Keisuke Harigaya +1

We study lepto-axiogenesis in theories where the right-handed neutrino is light enough that its dynamics affect the determination of the baryon asymmetry. When compared with theori…

Radiative Majorana Neutrino Masses in a Parity Solution to the Strong CP Problem

Lawrence J. Hall, Keisuke Harigaya, Yogev Shpilman

The strong CP problem can be solved in Parity symmetric theories with electroweak gauge group containing $S U (2)_{L} \times S U (2)_{R}$ broken by the minimal Higgs content. Neutrino mass…

ALP-Assisted Strong First-Order Electroweak Phase Transition and Baryogenesis

Keisuke Harigaya, Isaac R. Wang

Axion-like particles (ALPs) can be naturally lighter than the electroweak scale. We consider an ALP that couples to the Standard Model Higgs to achieve the strong first-order elect…

Leptogenesis in Parity Solutions to the Strong CP Problem and Standard Model Parameters

Juanca Carrasco-Martinez, David I. Dunsky, Lawrence J. Hall +1

We study the simplest theories with exact spacetime parity that solve the strong CP problem and successfully generate the cosmological baryon asymmetry via decays of right-handed n…

Precision Electroweak Tensions and a Dark Photon

Keisuke Harigaya, Evan Petrosky, Aaron Pierce

We examine how different assumptions about the hadronic vacuum polarization, the $W$ boson mass, and the forward-backward asymmetry in $b$ -quarks at the $Z$ pole can impact the pre…

hep-ph2023★ 18 cited

Axion Poltergeist

Keisuke Harigaya, Keisuke Inomata, Takahiro Terada

Rotations of axion fields in the early universe can produce dark matter and the matter-antimatter asymmetry of the universe. We point out that the rotation can generate an observab…

hep-ph2023★ 3 cited

$Z_{2}$ -Odd Polonyi Field in Twin Higgs Model

Gongjun Choi, Keisuke Harigaya

We consider a supersymmetric mirror Twin Higgs model in a gravity-mediated supersymmetry-breaking scenario. We point out that the Polonyi field can be odd under the $Z_{2}$ symmetr…