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New physics from the polarized light of the cosmic microwave background
The current cosmological model requires new physics beyond the standard model of
elementary particles and fields, such as dark matter and dark energy. Their nature is …
elementary particles and fields, such as dark matter and dark energy. Their nature is …
The weak gravity conjecture and emergence from an ultraviolet cutoff
We study ultraviolet cutoffs associated with the Weak Gravity Conjecture (WGC) and
Sublattice Weak Gravity Conjecture (sLWGC). There is a magnetic WGC cutoff at the energy …
Sublattice Weak Gravity Conjecture (sLWGC). There is a magnetic WGC cutoff at the energy …
Probing the universe through the stochastic gravitational wave background
S Kuroyanagi, T Chiba… - Journal of Cosmology and …, 2018 - iopscience.iop.org
Stochastic gravitational wave backgrounds, predicted in many models of the early universe
and also generated by various astrophysical processes, are a powerful probe of the …
and also generated by various astrophysical processes, are a powerful probe of the …
LiteBIRD science goals and forecasts. A case study of the origin of primordial gravitational waves using large-scale CMB polarization
We study the possibility of using the LiteBIRD satellite B-mode survey to constrain models of
inflation producing specific features in CMB angular power spectra. We explore a particular …
inflation producing specific features in CMB angular power spectra. We explore a particular …
Backreaction of axion-SU (2) dynamics during inflation
We consider the effects of backreaction on axion-SU (2) dynamics during inflation. We use
the linear evolution equations for the gauge field modes and compute their backreaction on …
the linear evolution equations for the gauge field modes and compute their backreaction on …
Axion gauge field inflation and gravitational leptogenesis: A lower bound on modes from the matter-antimatter asymmetry of the Universe
We present a toy model of an axion gauge field inflation scenario that yields viable density
and gravitational wave spectra. The scenario consists of an axionic inflaton in a steep …
and gravitational wave spectra. The scenario consists of an axionic inflaton in a steep …
Large tensor non-Gaussianity from axion-gauge field dynamics
We show that an inflation model in which a spectator axion field is coupled to an SU (2)
gauge field produces a large three-point function (bispectrum) of primordial gravitational …
gauge field produces a large three-point function (bispectrum) of primordial gravitational …
Chromo-natural inflation supported by enhanced friction from Horndeski gravity
We study the extension of the chromo-natural inflation model by incorporating nonminimal
coupling between the axion field and gravity. Nonminimal coupling is introduced so that it …
coupling between the axion field and gravity. Nonminimal coupling is introduced so that it …
Gravitational axiverse spectroscopy: seeing the forest for the axions
A bstract We consider inflationary models with multiple spectator axions coupled to dark
gauge sectors via Chern-Simons (CS) terms. The energy injection into Abelian gauge fields …
gauge sectors via Chern-Simons (CS) terms. The energy injection into Abelian gauge fields …
Parity-violating scalar trispectrum from a rolling axion during inflation
T Fujita, T Murata, I Obata… - Journal of Cosmology and …, 2024 - iopscience.iop.org
We study a mechanism of generating the trispectrum (4-point correlation) of curvature
perturbation through the dynamics of a spectator axion field and U (1) gauge field during …
perturbation through the dynamics of a spectator axion field and U (1) gauge field during …