247 citations · 2k across the 37 of their papers we have counts for
37 papers
Peaky Production of Light Dark Photon Dark Matter
Yuichiro Nakai, Ryo Namba, Ippei Obata
We explore a mechanism to produce a light dark photon dark matter through a coupling between the dark photon field and a spectator scalar field which plays no role in the inflation…
Bouncing Cosmology in VCDM
Alexander Ganz, Paul Martens, Shinji Mukohyama +1
We construct an asymmetric bouncing scenario within the VCDM model - also known as type-II minimally modified gravity -, a modified gravity theory with two local physical degrees o…
Reheating after relaxation of large cosmological constant
Paul Martens, Shinji Mukohyama, Ryo Namba
We present a cosmological model of an early-time scenario that incorporates a relaxation process of the would-be large vacuum energy, followed by a reheating era connecting to the…
Universality of linear perturbations in SU()-natural inflation
Tomohiro Fujita, Kai Murai, Ryo Namba
We prove the universality of predictions for linear perturbations from the entire class of models of inflation driven by a pseudo-scalar field coupled to an SU() gauge boson, wh…
Positivity vs. Lorentz-violation: an explicit example
Katsuki Aoki, Shinji Mukohyama, Ryo Namba
We show how a class of multi-field scalar-field theories in a Lorentz-breaking background imposes consistency conditions on its effective theory of a single field and provides an e…
Partial UV Completion of from a Curved Field Space
Shinji Mukohyama, Ryo Namba
The -essence theory is a prototypical class of scalar-field models that already gives rich phenomenology and has been a target of extensive studies in cosmology. General forms o…