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Probing the Early Universe with the CMB Scalar, Vector and Tensor Bispectrum
Maresuke Shiraishi
Although cosmological observations suggest that the fluctuations of seed fields are almost Gaussian, the possibility of a small deviation of their fields from Gaussianity is widely…
CMB power spectra induced by primordial cross-bispectra between metric perturbations and vector fields
Maresuke Shiraishi, Shohei Saga, Shuichiro Yokoyama
We study temperature and polarization anisotropies of the cosmic microwave background (CMB) radiation sourced from primordial cross-bispectra between metric perturbations and vecto…
Full bispectra from primordial scalar and tensor perturbations in the most general single-field inflation model
Xian Gao, Tsutomu Kobayashi, Maresuke Shiraishi +3
We compute the full bispectra, namely both auto- and cross- bispectra, of primordial curvature and tensor perturbations in the most general single-field inflation model whose scala…
Parity violation of primordial magnetic fields in the CMB bispectrum
Maresuke Shiraishi
We study the parity violation in the cosmic microwave background (CMB) bispectrum induced by primordial magnetic fields (PMFs). Deriving a general formula for the CMB bispectrum ge…
Optimal limits on primordial magnetic fields from CMB temperature bispectrum of passive modes
Maresuke Shiraishi, Daisuke Nitta, Shuichiro Yokoyama +1
We investigate bounds on the strength of the primordial magnetic field (PMF) from the cosmic microwave background (CMB) bispectra of the intensity (temperature) modes induced from…