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Relic abundance of dark photon dark matter
- P. Agrawal, N. Kitajima, M. Reece, Toyokazu Sekiguchi, F. Takahashi
- PhysicsPhysics Letters B
- 16 October 2018
Topological defects and nano-Hz gravitational waves in aligned axion models
- Tetsutaro Higaki, K. Jeong, N. Kitajima, Toyokazu Sekiguchi, F. Takahashi
- Physics
- 17 June 2016
A bstractWe study the formation and evolution of topological defects in an aligned axion model with multiple Peccei-Quinn scalars, where the QCD axion is realized by a certain combination of the…
Cosmological abundance of the QCD axion coupled to hidden photons
- N. Kitajima, Toyokazu Sekiguchi, F. Takahashi
- PhysicsPhysics Letters B
- 17 November 2017
Gravitational wave forest from string axiverse
- N. Kitajima, J. Soda, Y. Urakawa
- PhysicsJournal of Cosmology and Astroparticle Physics
- 18 July 2018
Axions predicted in string theory may have a scalar potential which has a much shallower potential region than the conventional cosine potential. We first show that axions which were located at such…
Efficient self-resonance instability from axions
- Hayato Fukunaga, N. Kitajima, Y. Urakawa
- PhysicsJournal of Cosmology and Astroparticle Physics
- 5 March 2019
It was recently shown that a coherent oscillation of an axion can cause an efficient parametric resonance, leading to a prominent emission of the gravitational waves (GWs). In this paper, conducting…
Hidden axion dark matter decaying through mixing with QCD axion and the 3.5 keV X-ray line
- Tetsutaro Higaki, N. Kitajima, F. Takahashi
- Physics
- 18 August 2014
Hidden axions may be coupled to the standard model particles through a kinetic or mass mixing with QCD axion. We study a scenario in which a hidden axion constitutes a part of or the whole of dark…
Domain Wall Formation from Level Crossing in the Axiverse
- R. Daido, N. Kitajima, F. Takahashi
- Physics
- 28 May 2015
We point out that domain wall formation is a more common phenomenon in the Axiverse than previously thought. Level crossing could take place if there is a mixing between axions, and if some of the…
Level crossing between the QCD axion and an axionlike particle
- R. Daido, N. Kitajima, F. Takahashi
- Physics
- 22 October 2015
We study a level crossing between the QCD axion and an axion-like particle, focusing on the recently found phenomenon, the axion roulette, where the axion-like particle runs along the potential,…
Inflation from a Supersymmetric Axion Model
- M. Kawasaki, N. Kitajima, K. Nakayama
- Physics
- 30 August 2010
We show that a supersymmetric axion model naturally induces a hybrid inflation with the waterfall field identified as a Peccei-Quinn scalar. The Peccei-Quinn scale is predicted to be around 10 15 GeV…
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