635 citations · 6.2k across the 159 of their papers we have counts for
9 papers · 1 filter
Cosmological Constraint on Dark Photon from
Masahiro Ibe, Shin Kobayashi, Yuhei Nakayama +1
A new U(1) gauge symmetry is the simplest extension of the Standard Model and has various theoretical and phenomenological motivations. In this paper, we study the cosmological con…
New Type of String Solutions with Long Range Forces
Takashi Hiramatsu, Masahiro Ibe, Motoo Suzuki
We explore the formation and the evolution of the string network in the Abelian Higgs model with two complex scalar fields. A special feature of the model is that it possesses a gl…
A Dynamical Solution to the Axion Domain Wall Problem
Masahiro Ibe, Shin Kobayashi, Motoo Suzuki +1
The domain wall problem and the isocurvature problem restrict possible combinations of axion models and inflation models. In this paper, we considered a new mechanism which solves…
Fragileness of Exact I-ball/Oscillon
Masahiro Ibe, Masahiro Kawasaki, Wakutaka Nakano +1
I-ball/oscillon is a soliton-like oscillating configuration of a real scalar field which lasts for a long time. I-ball/oscillon is a minimum energy state for a given adiabatic inva…
Baryon-Dark Matter Coincidence in Mirrored Unification
Masahiro Ibe, Ayuki Kamada, Shin Kobayashi +2
About 80\% of the mass of the present Universe is made up of the unknown (dark matter), while the rest is made up of ordinary matter. It is a very intriguing question why the {\it…
Oscillating Composite Asymmetric Dark Matter
Masahiro Ibe, Shin Kobayashi, Ryo Nagai +1
The asymmetric dark matter (ADM) scenario can solve the coincidence problem between the baryon and the dark matter (DM) abundance when the DM mass is of GeV. In the…