87 citations · 561 across the 20 of their papers we have counts for
20 papers
Gravitational wave search through electromagnetic telescopes
Asuka Ito, Kazunori Kohri, Kazunori Nakayama
We study the graviton-photon conversion in the magnetic fields of the Earth, the Milky Way Galaxy, and intergalactic regions. Requiring that the photon flux converted from graviton…
Probing high frequency gravitational waves with pulsars
Asuka Ito, Kazunori Kohri, Kazunori Nakayama
We study graviton-photon conversion in magnetosphere of a pulsar and explore the possibility of detecting high frequency gravitational waves with pulsar observations. It is shown t…
Exploring High Frequency Gravitational Waves with Magnons
Asuka Ito, Jiro Soda
Detecting gravitational waves with frequencies higher than 10 kHz requires new strategies. In previous papers, we proposed magnon gravitational wave detectors and gave the first li…
Superluminal propagation from IR physics
Asuka Ito, Teruaki Suyama
One may believe that front velocities of waves in a given theory coincide with the UV limit of phase velocities for any dispersion relations. This implies that IR physics is irrele…
Gravitational Waves in Metastable Supersymmetry Breaking
Chong-Sun Chu, Asuka Ito
If supersymmetry is broken in metastable vacua, it is not clear why we are now in there rather than supersymmetric vacua. Moreover, it is natural to expect that we were in supersym…
Tree-level unitarity in Higgs inflation in the metric and the Palatini formulation
Asuka Ito, Wafaa Khater, Syksy Rasanen
We calculate the tree-level amplitudes for electrically neutral scattering for the Standard Model Higgs doublet non-minimally coupled to the Ricci scalar. We consider both…
Cosmic No-hair Conjecture and Inflation with an SU(3) Gauge Field
Pengyuan Gao, Kazufumi Takahashi, Asuka Ito +1
We study inflationary universes with an SU(3) gauge field coupled to an inflaton through a gauge kinetic function. Although the SU(3) gauge field grows at the initial stage of infl…
Axion search with quantum nondemolition detection of magnons
Tomonori Ikeda, Asuka Ito, Kentaro Miuchi +3
The axion provides a solution for the strong CP problem and is one of the leading candidates for dark matter. This paper proposes an axion detection scheme based on quantum nondemo…
Inertial and gravitational effects on a geonium atom
Asuka Ito
We reveal all linear order inertial and gravitational effects on a non-relativistic Dirac particle (mass ) on the Earth up to the order of in the Foldy-Wouthuysen-like exp…
Analytic formula for the dynamics around inflation end and implications on primordial gravitational waves
Asuka Ito, Jiro Soda, Masahide Yamaguchi
We argue that primordial gravitational waves have a spectral break and its information is quite useful for exploring the early universe. Indeed, such a spectral break can be a fing…
A formalism for magnon gravitational wave detectors
Asuka Ito, Jiro Soda
In order to detect high frequency gravitational waves, we need a new detection method. In this paper, we develop a formalism for a gravitational wave detector using magnons in a ca…
Pulsar timing residual induced by ultralight vector dark matter
Kimihiro Nomura, Asuka Ito, Jiro Soda
We study the ultralight vector dark matter with a mass around . The vector field oscillating coherently on galactic scales induces oscillations of the spacet…
Accelerating Universe with a stable extra dimension in cuscuton gravity
Asuka Ito, Yuki Sakakihara, Jiro Soda
We study Kaluza-Klein cosmology in cuscuton gravity and find an exact solution describing an accelerating 4-dimensional universe with a stable extra dimension. A cuscuton which is…
Probing GHz Gravitational Waves with Graviton-magnon Resonance
Asuka Ito, Tomonori Ikeda, Kentaro Miuchi +1
A novel method for extending frequency frontier in gravitational wave observations is proposed. It is shown that gravitational waves can excite a magnon. Thus, gravitational waves…
Dressed Power-law Inflation with Cuscuton
Asuka Ito, Aya Iyonaga, Suro Kim +1
We study dressed inflation with a cuscuton and find a novel exact power-law solution. It is well known that the conventional power-law inflation is inconsistent with the Planck dat…
Searching for Bispectrum of Stochastic Gravitational Waves with Pulsar Timing Arrays
Makoto Tsuneto, Asuka Ito, Toshifumi Noumi +1
We study how to probe bispectra of stochastic gravitational waves with pulsar timing arrays. The bispectrum is a key to probe the origin of stochastic gravitational waves. In parti…
Anisotropic Constant-roll Inflation
Asuka Ito, Jiro Soda
We study constant-roll inflation in the presence of a gauge field coupled to an inflaton. By imposing the constant anisotropy condition, we find new exact anisotropic constant-roll…
Primordial Gravitational Waves Induced by Magnetic Fields in an Ekpyrotic Scenario
Asuka Ito, Jiro Soda
Both inflationary and ekpyrotic scenarios can account for the origin of the large scale structure of the universe. It is often said that detecting primordial gravitational waves is…
MHz Gravitational Waves from Short-term Anisotropic Inflation
Asuka Ito, Jiro Soda
We reveal the universality of short-term anisotropic inflation. As a demonstration, we study inflation with an exponential type gauge kinetic function which is ubiquitous in models…
Designing Anisotropic Inflation with Form Fields
Asuka Ito, Jiro Soda
We study inflation with anisotropic hair induced by form fields. In four dimensions, the relevant form fields are gauge (one-form) fields and two-form fields. Assuming the exponent…