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Cosmological perturbations in a healthy extension of Hořava gravity

- Tsutomu Kobayashi, Y. Urakawa, Masahide Yamaguchi
- Physics
- 16 February 2010

In Hořava's theory of gravity, Lorentz symmetry is broken in exchange for renormalizability, but the original theory has been argued to be plagued with problems associated with a new scalar mode… Expand

Distillation of Liquid Xenon to Remove Krypton

- K. Abe, J. Hosaka,
+45 authors Y. Kamioka - Computer Science
- 25 September 2008

Holographic inflation and the conservation of ζ

- J. Garriga, Y. Urakawa
- Physics
- 21 March 2014

A bstractIn a holographic description of inflation, cosmological time evolution in the bulk is expected to correspond to the renomalization group (RG) flow in a dual boundary theory. Here, we analyze… Expand

Endothelin antagonistic peptide derivatives with high selectivity for ETA receptors

- K. Ishikawa, T. Fukami,
+9 authors M. Yano - Biology
- 1993

Linear peptide ETA antagonists: rational design and practical derivatization of N-terminal amino- and imino-carbonylated tripeptide derivatives☆

- T. Nagase, T. Mase,
+10 authors K. Ishikawa - Chemistry
- 6 July 1995

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… Expand

Multi-field inflation from holography

- J. Garriga, Kostas Skenderis, Y. Urakawa
- Physics
- 13 October 2014

We initiate the study of multi-field inflation using holography. Bulk light scalar fields correspond to nearly marginal operators in the boundary theory and the dual quantum field theory is a… Expand

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… Expand

Strong restriction on inflationary vacua from the local gauge invariance III: Infrared regularity of graviton loops

- Takahiro Tanaka, Y. Urakawa
- Physics
- 10 February 2014

It has been claimed that the super-Hubble modes of the graviton generated during inflation can make loop corrections diverge. Even if we introduce an infrared (IR) cutoff at a comoving scale as an ad… Expand

Inflation and deformation of conformal field theory

- J. Garriga, Y. Urakawa
- Physics
- 24 March 2013

It has recently been suggested that a strongly coupled phase of inflation may be described holographically in terms of a weakly coupled quantum field theory (QFT). Here, we explore the possibility… Expand

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