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Degenerate vacua as the origin of the dark energy
Jun'ichi Yokoyama
I propose a new mechanism to account for the observed tiny but finite dark energy in terms of a non-Abelian Higgs theory, which has infinitely many perturbative vacua characterized…
Quantitative evolution of global strings from the Lagrangian viewpoint
Masahide Yamaguchi, Jun'ichi Yokoyama
We clarify the quantitative nature of the cosmological evolution of a global string network, that is, the energy density, peculiar velocity, velocity squared, Lorentz factor, forma…
Stabilizing dilaton and baryogenesis
Alexander D. Dolgov, K. Kohri, Osamu Seto +1
Entropy production by the dilaton decay is studied in the model where the dilaton acquires potential via gaugino condensation in the hidden gauge group. Its effect on the Affleck-D…
Cosmic Inversion II --An iterative method for reproducing the primordial spectrum from the CMB data--
Makoto Matsumiya, Misao Sasaki, Jun'ichi Yokoyama
Pursuing the original idea proposed in our previous paper (Paper I), we improve the method to determine the shape of the initial curvature perturbation spectrum from the CMB…
Vacuum selection by inflation as the origin of the dark energy
Jun'ichi Yokoyama
I propose a new mechanism to account for the observed tiny but finite dark energy in terms of a non-Abelian Higgs theory, which has infinitely many perturbative vacua characterized…
Lagrangian evolution of global strings
Masahide Yamaguchi, Jun'ichi Yokoyama
We establish a method to trace the Lagrangian evolution of extended objects consisting of a multicomponent scalar field in terms of a numerical calculation of field equations in th…
On the origin of the cosmological constant
Jun'ichi Yokoyama
Under the assumption that the cosmological constant vanishes in the true ground state with lowest possible energy density, we argue that the observed small but finite vacuum-like e…