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Kink-antikink collision in a Lorentz-violating model
Haobo Yan, Yuan Zhong, Yu-Xiao Liu +1
In this work, kink-antikink collision in a two-dimensional Lorentz-violating model is considered. It is shown that the Lorentz-violating term in the proposed model does not a…
-attractor-type Double Inflation
Kei-ichi Maeda, Shuntaro Mizuno, Ryota Tozuka
We study the background dynamics and primordial perturbation in -attractor-type double inflation. The model is composed of two minimally coupled scalar fields, where each of the…
Condensate of Massive Graviton and Dark Matter
Katsuki Aoki, Kei-ichi Maeda
We study coherently oscillating massive gravitons in the ghost-free bigravity theory. This coherent field can be interpreted as a condensate of the massive gravitons. We first defi…
Cosmological Dynamics of D-BIonic and DBI Scalar Field and Coincidence Problem of Dark Energy
Sirachak Panpanich, Kei-ichi Maeda, Shuntaro Mizuno
We study the cosmological dynamics of D-BIonic and DBI scalar field, which is coupled to matter fluid. For the exponential potential and the exponential couplings, we find a new an…
Dynamical angled brane
Kei-ichi Maeda, Kunihito Uzawa
We discuss the dynamical D-brane solutions describing any number of D-branes whose relative orientations are given by certain SU(2) rotations. These are the generalization of…
Stability of the Early Universe in Bigravity Theory
Katsuki Aoki, Kei-ichi Maeda, Ryo Namba
We study the stability of a spherically symmetric perturbation around the flat Friedmann-Lematre-Robertson-Walker spacetime in the ghost-free bigravity theory, retaining non…