254 citations · 1.8k across the 51 of their papers we have counts for
4 papers · 1 filter
Nano-Hz gravitational wave signature from axion dark matter
Naoya Kitajima, Jiro Soda, Yuko Urakawa
We calculate the accurate spectrum of the stochastic gravitational wave background from U(1) gauge fields produced by axion dark matter. The explosive production of gauge fields so…
Using uniaxial stress to probe the relationship between competing superconducting states in a cuprate with spin-stripe order
Z. Guguchia, D. Das, C. N. Wang +17
We report muon spin rotation and magnetic susceptibility experiments on in-plane stress effects on the static spin-stripe order and superconductivity in the cuprate system La2-xBax…
Primordial Black Holes from QCD Axion Bubbles
Naoya Kitajima, Fuminobu Takahashi
We propose a scenario in which a strong Peccei-Quinn (PQ) symmetry breaking in the early universe results in large inhomogeneities of the initial QCD axion field value, leading to…
Can axion clumps be formed in a pre-inflationary scenario?
Hayato Fukunaga, Naoya Kitajima, Yuko Urakawa
The QCD axion and an axion-like particle (ALP) are compelling candidates of dark matter. For the QCD axion, it is known that when the Peccei-Quinn (PQ) symmetry is spontaneously br…