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The Japanese space gravitational wave antenna?DECIGO

- S. Kawamura, M. Ando, +142 authors K. Sun
- Physics
- 21 April 2006

DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational wave antenna. It aims at detecting various kinds of gravitational waves between 1 mHz and… Expand

Threshold of primordial black hole formation

- T. Harada, Chul-Moon Yoo, K. Kohri
- Physics
- 17 September 2013

Based on a physical argument, we derive a new analytic formula for the amplitude of density perturbation at the threshold of primordial black hole formation in the universe dominated by a perfect… Expand

The status of DECIGO

- Shuichi Sato, Seiji Kawamura, +133 authors T. Yoshino
- Physics
- 1 June 2017

DECIGO (DECi-hertz Interferometer Gravitational wave Observatory) is the planned Japanese space gravitational wave antenna, aiming to detect gravitational waves from astrophysically and… Expand

The Japanese space gravitational wave antenna DECIGO

- S. Kawamura, H. Matsuhara, +99 authors H. Kunimori
- Physics
- 2006

The Japanese space gravitational wave antenna

- S. Kawamura, M. Ando, +142 authors K. Sun
- Physics
- 7 May 2011

Cosmological long-wavelength solutions and primordial black hole formation

- T. Harada, Chul-Moon Yoo, T. Nakama, Yasutaka Koga
- Physics
- 12 March 2015

We construct cosmological long-wavelength solutions without symmetry in general gauge conditions compatible with the long-wavelength scheme. We then specify the relationship among the solutions in… Expand

Neutron stars in scalar tensor theories of gravity and catastrophe theory

- T. Harada
- Physics
- 14 January 1998

We investigate neutron stars in scalar-tensor theories. We examine their secular stability against spherically symmetric perturbations by use of a turning point method. For some choices of the… Expand

Current status of space gravitational wave antenna DECIGO and B-DECIGO

- S. Kawamura, M. Ando, +84 authors Zong-Hong Zhu
- Physics
- Progress of Theoretical and Experimental Physics
- 22 February 2021

The Deci-hertz Interferometer Gravitational Wave Observatory (DECIGO) is a future Japanese space mission with a frequency band of 0.1 Hz to 10 Hz. DECIGO aims at the detection of primordial… Expand

Have we already detected astrophysical symptoms of space-time noncommutativity?

- T. Tamaki, T. Harada, U. Miyamoto, T. Torii
- Physics
- 18 November 2001

We discuss astrophysical implications of $\kappa$-Minkowski space-time, in which there appears space-time noncommutativity. We first derive a velocity formula for particles based on the motion of a… Expand

Self-Similar Solutions, Critical Behavior and Convergence to Attractor in Gravitational Collapse

- T. Harada
- Physics
- 3 February 2003

General relativity as well as Newtonian gravity admits self-similar solutions due to its scale-invariance. This is a review on these self-similar solutions and their relevance to gravitational… Expand

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