Speaker
Komei Goto
(Keio University)
Description
We propose an inflationary model based on finite modular
symmetry, in which a Coleman-Weinberg potential is induced by
heavy vector-like quarks coupled to a complex modulus $\tau$
through modular forms. The imaginary part of $\tau$ plays the
role of the inflaton, while its real part is interpreted as an
axion-like field. We demonstrate that the resulting inflationary
dynamics can be compatible with current cosmological
observations, including Planck constraints. We further
investigate the cosmological implications of the axion-like
degree of freedom, which acquires a nonzero mass and can dominate
the energy density of the Universe after inflation.
Authors
Junichiro Kawamura
(Waseda University)
Komei Goto
(Keio University)
Tatsuo Kobayashi
(Hokkaido University)
Tetsutaro HIGAKI
(Keio University)
Yoshihiko Abe
(慶應義塾大学)