5 papers
Primordial tensor mode from the neutrino sector
Shohei Saga, Shuichiro Yokoyama
We show that a regular solution for primordial tensor fluctuations can arise from the higher-order multipoles of the collisionless neutrino distribution after neutrino decoupling.…
Revisiting constraints on primordial vector modes and implications for sourced magnetic fields and observed power spectrum
Kaito Yura, Shohei Saga, Shuichiro Yokoyama +1
We revisit regular primordial vector modes sustained by the anisotropic stress of free-streaming neutrinos. We consider two classes of neutrino-sector initial conditions, the neutr…
Parity-violating scalar trispectrum from helical primordial magnetic fields
Kaito Yura, Shohei Saga, Maresuke Shiraishi +1
Some recent observations of the cosmic microwave background (CMB) anisotropies and the large-scale structure of the Universe imply cosmic parity violation. Among possible parity-vi…
Shapes and orientations of massive halos in the statistically anisotropic universe
Shogo Masaki, Yurino Mizuguchi, Shohei Saga +1
We investigate how statistical anisotropy (SA) in matter distributions affects the distributions of shapes and orientations of cluster-sized halos, using cosmological -body simu…
First confirmation of anisotropic halo bias from statistically anisotropic matter distributions
Shogo Masaki, Maresuke Shiraishi, Takahiro Nishimichi +2
We confirm for the first time the existence of distinctive halo bias associated with the quadrupolar type of statistical anisotropy (SA) of the linear matter density field using co…