Inflationary universe with anisotropic hair.
- Masa-aki Watanabe, S. Kanno, J. Soda
- PhysicsPhysical Review Letters
- 17 February 2009
A universal relation between the anisotropy and a slow-roll parameter of inflation is found and has observational implications and gives a counterexample to the cosmic no-hair conjecture.
Holographic superconductors with higher curvature corrections
- R. Gregory, S. Kanno, J. Soda
- Physics
- 18 July 2009
We study (3+1)-dimensional holographic superconductors in Einstein-Gauss-Bonnet gravity both numerically and analytically. It is found that higher curvature corrections make condensation harder. We…
Anisotropic power-law inflation
- S. Kanno, J. Soda, Masa-aki Watanabe
- Physics
- 26 October 2010
We study an inflationary scenario in supergravity model with a gauge kinetic function. We find exact anisotropic power-law inflationary solutions when both the potential function for an inflaton and…
Lorentz violating inflation
We explore the impact of Lorentz violation on the inflationary scenario. More precisely, we study the inflationary scenario in the scalar-vector-tensor theory where the Lorentz violating vector is…
Primordial statistical anisotropy generated at the end of inflation
- S. Yokoyama, J. Soda
- Physics
- 28 May 2008
We present a new mechanism for generating primordial statistical anisotropy of curvature perturbations. We introduce a vector field which has a non-minimal kinetic term and couples with a waterfall…
The Nature of Primordial Fluctuations from Anisotropic Inflation
- Masa-aki Watanabe, S. Kanno, J. Soda
- Physics
- 27 February 2010
We study the statistical nature of primordial fluctuations from an anisotropic inflation which is realized by a vector field coupled to an inflaton. We find a suitable gauge, which we call the…
Radion and holographic brane gravity
The low energy effective theory for the Randall-Sundrum two brane system is investigated with an emphasis on the role of the non-linear radion in the brane world. The equations of motion in the bulk…
Parity violation in graviton non-gaussianity
- J. Soda, H. Kodama, Masato Nozawa
- Physics
- 16 June 2011
We study parity violation in graviton non-gaussianity generated during inflation. We develop a useful formalism to calculate graviton non-gaussianity. Using this formalism, we explicitly calculate…
Imprints of the anisotropic inflation on the cosmic microwave background
- Masa-aki Watanabe, S. Kanno, J. Soda
- Physics
- 16 November 2010
We study the imprints of the anisotropic inflation on the CMB temperature fluctuations and polarizations. The statistical anisotropy stems not only from the direction dependence of curvature and…
Observational signatures of anisotropic inflationary models
- Junko Ohashi, J. Soda, S. Tsujikawa
- Physics
- 21 August 2013
We study observational signatures of two classes of anisotropic inflationary models in which an inflaton field couples to (i) a vector kinetic term F_{mu nu}F^{mu nu} and (ii) a two-form kinetic term…
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