126 citations · 1.4k across the 40 of their papers we have counts for
40 papers
g formalism
Takahiro Tanaka, Yuko Urakawa
The formalism has been the major computational tool to study the superhorizon evolution of the scalar type perturbation sourced by scalar fields. Recently, this formalism was…
Statistical anisotropy of primordial gravitational waves from generalized formalism
Takahiro Tanaka, Yuko Urakawa
In this letter, we demonstrate how to use the generalized formalism, which enables us to compute the evolution of all the large scale fluctuations, including gravitational wav…
New scenario of QCD axion clump formation I: Linear analysis
Naoya Kitajima, Kazuhiro Kogai, Yuko Urakawa
The QCD axion acquires the potential through the non-perturbative effect of the QCD matters around the QCD phase transition. During this period, the direct interaction between the…
Anisotropic separate universe and Weinberg's adiabatic mode
Takahiro Tanaka, Yuko Urakawa
In the separate universe approach, an inhomogeneous universe is rephrased as a set of glued numerous homogeneous local patches. This is the essence of the gradient expansion and th…
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…
Galaxy imaging surveys as spin-sensitive detector for cosmological colliders
Kazuhiro Kogai, Kazuyuki Akitsu, Fabian Schmidt +1
Galaxy imaging surveys provide us with information on both the galaxy distribution and their shapes. In this paper, we systematically investigate the sensitivity of galaxy shapes t…