Tomohiro Fujita

Large-scale magnetic fields can explain the baryon asymmetry of the Universe

Helical hypermagnetic fields in the primordial Universe can produce the observed amount of baryon asymmetry through the chiral anomaly without any ingredients beyond the standard model of particle physics. While they generate no

Finding the chiral gravitational wave background of an axion-SU(2) inflationary model using CMB observations and laser interferometers

B-L

A method for linking process-level variability to system performances

asymmetry, the generated baryon asymmetry survives the spharelon washout effect, because the generating process remains active until the electroweak phase transition. Solving the Boltzmann equation numerically and finding an attractor solution, we show that the baryon asymmetry of our Universe can be explained, if the present large-scale magnetic fields indicated by the blazar observations have a negative helicity and existed in the early Universe before the electroweak phase transition. We also derive the upper bound on the strength of the helical magnetic field, which is tighter than the cosmic microwave background constraint, to avoid the overproduction of baryon asymmetry.

Tensor non-Gaussianity from axion-gauge-fields dynamics: parameter search

A detection of B-mode polarization of the Cosmic Microwave Background (CMB) anisotropies would confirm the presence of a primordial gravitational wave background (GWB). In the inflation paradigm this would be an unprecedented probe of the energy scale of inflation as it is directly proportional to the power spectrum of the GWB. However, similar tensor perturbations can be produced by the matter fields present during inflation, breaking this simple relationship. It is therefore important to be able to distinguish between different generation mechanisms of the GWB. In this paper, we analyse the detectability of a new axion-SU(2) gauge field model using its chiral, scale-dependent tensor spectrum. We forecast the detectability of the resulting CMB TB and EB cross-correlations by the LiteBIRD satellite, considering the effects of residual foregrounds, gravitational lensing, and for the first time assess the ability of such an experiment to jointly detect primordial TB and EB spectra and self-calibrate its polarimeter. We find that LiteBIRD will be able to detect the chiral signal for

Does anisotropic inflation produce a small statistical anisotropy

r_*>0.03

Statistical delay calculation with vector synthesis model

with

Statistically anisotropic tensor modes from inflation

r_*

Quantum entanglement in multi-field inflation

denoting the tensor-to-scalar ratio at the peak scale, and that the maximum signal-to-noise for

Large tensor non-Gaussianity from axion-gauge field dynamics

r_*<0.07

Ficus natalensis facilitates the establishment of a montane rain-forest tree in south-east African tropical woodlands

is