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Polypolar spherical harmonic decomposition of galaxy correlators in redshift space: Toward testing cosmic rotational symmetry
Maresuke Shiraishi, Naonori S. Sugiyama, Teppei Okumura
We propose an efficient way to test rotational invariance in the cosmological perturbations by use of galaxy correlation functions. In symmetry-breaking cases, the galaxy power spe…
Parity violation in the CMB trispectrum from the scalar sector
Maresuke Shiraishi
Under the existence of chiral non-Gaussian sources during inflation, the trispectrum of primordial curvature perturbations can break parity. We examine signatures of the induced tr…
Angular dependence of primordial trispectra and CMB spectral distortions
Maresuke Shiraishi, Nicola Bartolo, Michele Liguori
Under the presence of anisotropic sources in the inflationary era, the trispectrum of the primordial curvature perturbation has a very specific angular dependence between each wave…
Testing statistics of the CMB B-mode polarization toward unambiguously establishing quantum fluctuation of vacuum
Maresuke Shiraishi, Chiaki Hikage, Ryo Namba +2
The B-mode polarization in the cosmic microwave background (CMB) anisotropies at large angular scales provides a smoking-gun evidence for the primordial gravitational waves (GWs).…
Violation of statistical isotropy and homogeneity in the 21-cm power spectrum
Maresuke Shiraishi, Julian B. Muñoz, Marc Kamionkowski +1
Most inflationary models predict primordial perturbations to be statistically isotropic and homogeneous. Cosmic microwave background (CMB) observations, however, indicate a possibl…