269 citations · 605 across the 19 of their papers we have counts for
20 papers
Constant Scaling Fails for Global Monopole Networks
Wakutaka Nakano, Wen Yin
Global monopoles, which can also be understood as the zero-gauge-coupling limit of gauged monopoles, can form in the early Universe and evolve following a scaling network, as do ot…
PBHs and GWs from Scaling Monopoles
Daiki Aburatani, Wakutaka Nakano, Wen Yin
Monopoles with sufficiently weak gauge couplings, or from global symmetries, can form scaling networks in the early Universe whose average energy density tracks the cosmological ba…
Super-Heisenberg protocol for dark matter and high-frequency gravitational wave search
Wakutaka Nakano, Ryoto Takai
We propose a quantum-enhanced sensing scheme for the detection of wave-like dark matter and high-frequency gravitational waves using two-dimensional ion crystals in a Penning trap.…
Quantum sensing of high-frequency gravitational waves with ion crystals
Asuka Ito, Ryuichiro Kitano, Wakutaka Nakano +1
A detection method for high-frequency gravitational waves using two-dimensional ion crystals is investigated. Gravitational waves can resonantly excite the drumhead modes of the io…
Comparison of the Migdal transition probabilities in electron-atom inelastic cross sections
Wakutaka Nakano
The Migdal transition probabilities for dark matter scattering are compared to the total single-electron inelastic cross sections of electron-atom scattering for isolated Ar and Xe…
Gravitational wave spectrum from expanding string loops on domain walls: Implication for nanohertz pulsar timing array signal
Yu Hamada, Wakutaka Nakano
We analytically calculate the spectrum of stochastic gravitational waves (GWs) emitted by expanding string loops on domain walls in the scenario where domain walls decay by nucleat…
Quantum entanglement of ions for light dark matter detection
Asuka Ito, Ryuichiro Kitano, Wakutaka Nakano +1
A detection scheme is explored for light dark matter, such as axion dark matter or dark photon dark matter, using a Paul ion trap system. We first demonstrate that a qubit, constru…
Probing Oscillons of Ultra-Light Axion-like Particle by 21cm Forest
Masahiro Kawasaki, Wakutaka Nakano, Hiromasa Nakatsuka +1
Ultra-Light Axion-like Particle (ULAP) is motivated as one of the solutions to the small scale problems in astrophysics. When such a scalar particle oscillates with an $\mathcal{O}…
Oscillons of Axion-Like Particle: Mass distribution and power spectrum
Masahiro Kawasaki, Wakutaka Nakano, Hiromasa Nakatsuka +1
In string theory, the simultaneous existence of many Axion-Like Particles (ALPs) are suggested over a vast mass range, and a variety of potentials have been developed in the contex…
Detection capability of Migdal effect for argon and xenon nuclei with position sensitive gaseous detectors
Kiseki D. Nakamura, Kentaro Miuchi, Shingo Kazama +3
Migdal effect is attracting interests because of the potential to enhance the sensitivities of direct dark matter searches to the low mass region. In spite of its great importance,…
Oscillon of Ultra-Light Axion-like Particle
Masahiro Kawasaki, Wakutaka Nakano, Eisuke Sonomoto
Ultra-light axion-like particle (ULAP) is one of attractive candidates for cold dark matter. Because the de Broglie wavelength of ULAP with mass is $\mathc…
Fragileness of Exact I-ball/Oscillon
Masahiro Ibe, Masahiro Kawasaki, Wakutaka Nakano +1
I-ball/oscillon is a soliton-like oscillating configuration of a real scalar field which lasts for a long time. I-ball/oscillon is a minimum energy state for a given adiabatic inva…
Baryon-Dark Matter Coincidence in Mirrored Unification
Masahiro Ibe, Ayuki Kamada, Shin Kobayashi +2
About 80\% of the mass of the present Universe is made up of the unknown (dark matter), while the rest is made up of ordinary matter. It is a very intriguing question why the {\it…
Oscillating Composite Asymmetric Dark Matter
Masahiro Ibe, Shin Kobayashi, Ryo Nagai +1
The asymmetric dark matter (ADM) scenario can solve the coincidence problem between the baryon and the dark matter (DM) abundance when the DM mass is of GeV. In the…
Decay of I-ball/Oscillon in Classical Field Theory
Masahiro Ibe, Masahiro Kawasaki, Wakutaka Nakano +1
I-balls/oscillons are long-lived and spatially localized solutions of real scalar fields. They are produced in various contexts of the early universe in, such as, the inflaton evol…
Ultraviolet Completion of a Composite Asymmetric Dark Matter Model with a Dark Photon Portal
Masahiro Ibe, Ayuki Kamada, Shin Kobayashi +2
Composite asymmetric dark matter scenarios naturally explain why the dark matter mass density is comparable with the visible matter mass density. Such scenarios generically require…
Composite Asymmetric Dark Matter with a Dark Photon Portal
Masahiro Ibe, Ayuki Kamada, Shin Kobayashi +1
Asymmetric dark matter (ADM) is an attractive framework relating the observed baryon asymmetry of the Universe to the dark matter density. A composite particle in a new strong dyna…
Migdal Effect in Dark Matter Direct Detection Experiments
Masahiro Ibe, Wakutaka Nakano, Yutaro Shoji +1
The elastic scattering of an atomic nucleus plays a central role in dark matter direct detection experiments. In those experiments, it is usually assumed that the atomic electrons…
Constraints on Gauge Interactions from Rare Kaon Decay
Masahiro Ibe, Wakutaka Nakano, Motoo Suzuki
A model with gauge symmetry is the least constrained model as a resolution to the disagreement of the muon anomalous magnetic moment between the theoretical predictions…
Thermal Relic Dark Matter Beyond the Unitarity Limit
Keisuke Harigaya, Masahiro Ibe, Kunio Kaneta +2
We discuss a simple model of thermal relic dark matter whose mass can be much larger than the so-called unitarity limit on the mass of point-like particle dark matter. The model co…