141 citations · 640 across the 23 of their papers we have counts for
24 papers
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 string…
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…
Detection of hidden photon dark matter using the direct excitation of transmon qubits
Shion Chen, Hajime Fukuda, Toshiaki Inada +3
We propose a novel dark matter detection method utilizing the excitation of superconducting transmon qubits. Assuming the hidden photon dark matter of a mass of ,…
QCD Axion Search with ILC Beam Facility
Hajime Fukuda, Hidetoshi Otono, Satoshi Shirai
One of the most promising methods to search for axions is a light-shining-through-walls (LSW) experiment. In this work, we discuss the possibility of performing an LSW experiment a…
On the Detection of QCD Axion Dark Matter by Coherent Scattering
Hajime Fukuda, Satoshi Shirai
The QCD axion is a promising candidate of the dark matter. In this paper, we discuss elastic scattering processes between nucleons and the QCD axion dark matter. We point out that…
Witten effect, anomaly inflow, and charge teleportation
Hajime Fukuda, Kazuya Yonekura
We study a phenomenon that electric charges are "teleported" between two spatially separated objects without exchanging charged particles at all. For example, this phenomenon happe…
Axion strings are superconducting
Hajime Fukuda, Aneesh V. Manohar, Hitoshi Murayama +1
We explore the cosmological consequences of the superconductivity of QCD axion strings. Axion strings can support a sizeable chiral electric current and charge, which alters their…
Aspects of Nonlinear Effect on Black Hole Superradiance
Hajime Fukuda, Kazunori Nakayama
Under some conditions, light boson fields grow exponentially around a rotating black hole, called the superradiance instability. We discuss effects of nonlinear interactions of the…
Cornering Higgsino: Use of Soft Displaced Track
Hajime Fukuda, Natsumi Nagata, Hideyuki Oide +2
Higgsino has been intensively searched for in the LHC experiments in recent years. Currently, there is an uncharted region beyond the LEP Higgsino mass limit where the mass splitti…
How Heavy can Neutralino Dark Matter be?
Hajime Fukuda, Feng Luo, Satoshi Shirai
What is the upper limit of the mass of the neutralino dark matter whose thermal relic is consistent with the observation? If the neutralino dark matter and colored sparticles are e…
Phenomenological Consequences of the Refined Swampland Conjecture
Hajime Fukuda, Ryo Saito, Satoshi Shirai +1
We discuss phenomenological consequences of the recently-introduced refinements of the de Sitter swampland conjecture. The conjecture constraints the first and the second derivativ…
Gauged Peccei-Quinn Symmetry - A Case of Simultaneous Breaking of SUSY and PQ Symmetry
Hajime Fukuda, Masahiro Ibe, Motoo Suzuki +1
Recently, a simple prescription to embed the global Peccei-Quinn (PQ) symmetry into a gauged symmetry has been proposed. There, explicit breaking of the global PQ symmetry e…
Direct Detection of Ultralight Dark Matter via Astronomical Ephemeris
Hajime Fukuda, Shigeki Matsumoto, Tsutomu T. Yanagida
A novel idea of the direct detection to search for a ultralight dark matter based on the interaction between the dark matter and a nucleon is proposed. Solar system bodies feel the…
Current Status of Top-Specific Variant Axion Model
Cheng-Wei Chiang, Hajime Fukuda, Michihisa Takeuchi +1
The invisible variant axion model is very attractive as it is free from the domain wall problem. This model requires at least two Higgs doublets at the electroweak scale, with one…
Higgsino Dark Matter or Not: Role of Disappearing Track Searches at the LHC and Future Colliders
Hajime Fukuda, Natsumi Nagata, Hidetoshi Otono +1
Higgsino in supersymmetric standard models is known to be a promising candidate for dark matter in the Universe. Its phenomenological property is strongly affected by the gaugino f…
A "Gauged" Peccei-Quinn Symmetry
Hajime Fukuda, Masahiro Ibe, Motoo Suzuki +1
The Peccei-Quinn (PQ) solution to the strong problem requires an anomalous global symmetry, the PQ symmetry. The origin of such a convenient global symmetry is quite pu…
Dark Matter Candidates in a Visible Heavy QCD Axion Model
Hajime Fukuda, Masahiro Ibe, Tsutomu T. Yanagida
In this paper, we discuss dark matter candidates in a visible heavy QCD axion model. There, a mirror copied sector of the Standard Model with mass scales larger than the Standard M…
Cracking Down on Fake Photons - A Case of 750 GeV Diphoton Resonance -
Hajime Fukuda, Masahiro Ibe, Osamu Jinnouchi +1
Among various models to explain the GeV diphoton resonance hinted at the LHC Run 2, a class of models where the resonance decays not into a pair of photons but into a pair of…
750 GeV diphoton resonance in a visible heavy QCD axion model
Cheng-Wei Chiang, Hajime Fukuda, Masahiro Ibe +1
In this paper, we revisit a visible heavy QCD axion model in light of the recent reports on the GeV diphoton resonance by the ATLAS and CMS experiments. In this model, the ax…
Seminatural Gauge Mediation from Product Group Unification
Hajime Fukuda, Hitoshi Murayama, Tsutomu. T. Yanagida +1
We propose a focus point gauge mediation model based on the product group unification (PGU), which solves the doublet-triplet splitting problem of the Higgs multiplets. In the focu…
Flavor-Changing Neutral-Current Decays in Top-Specific Variant Axion Model
Cheng-Wei Chiang, Hajime Fukuda, Michihisa Takeuchi +1
The invisible variant axion model is very attractive as it is free from the domain wall problem. This model requires two Higgs doublets at the electroweak scale where one Higgs dou…
Diboson Resonance as a Portal to Hidden Strong Dynamics
Cheng-Wei Chiang, Hajime Fukuda, Keisuke Harigaya +2
We propose a new explanation for excess events observed in the search for a high-mass resonance decaying into dibosons by the ATLAS experiment. The resonance is identified as a com…
A Model of Visible QCD Axion
Hajime Fukuda, Keisuke Harigaya, Masahiro Ibe +1
We pursue a class of visible axion models where the axion mass is enhanced by strong dynamics in a mirrored copy of the Standard Model in the line of the idea put forward by Rubako…
Does asymmetric dark matter always lead to an anti-neutrino signal?
Hajime Fukuda, Shigeki Matsumoto, Satyanarayan Mukhopadhyay
Under rather generic assumptions, we show that in the asymmetric dark matter (ADM) scenario, the sign of the B-L asymmetry stored in the dark matter sector and the standard model s…