Takeshi Kobayashi

Research Interests

I have worked on early universe cosmology, focusing especially on its connections with microscopic physics. I am interested in obtaining a unified view of the early universe through theoretical physics (such as string theory, particle physics, or some other quantum gravity theory), as well as extracting information on high energy physics from cosmological observations.

Positions Held

• 2011 - present Perimeter Institute for Theoretical Physics, Associate Postdoctoral Researcher
• 2011 - present Canadian Institute for Theoretical Astrophysics, University of Toronto, Postdoctoral Fellow
• 2011 - 2012 Research Center for the Early Universe, The University of Tokyo, Postdoctoral Fellow

Recent Publications

• Masahiro Kawasaki, Takeshi Kobayashi, Fuminobu Takahashi, Non-Gaussianity from Axionic Curvaton, JCAP 1303 (2013) 016, arxiv: 1210.6595
• Takeshi Kobayashi, Jun'ichi Yokoyama, Primordial Spikes from Wrapped Brane Inflation, JCAP02(2013)005, arxiv: 1210.4427
• Takeshi Kobayashi, Tomo Takahashi, Runnings in the Curvaton, JCAP06(2012)004, arxiv: 1203.3011
• Takeshi Kobayashi, Fuminobu Takahashi, Tomo Takahashi, Masahide Yamaguchi, Dark Radiation from Modulated Reheating, JCAP03(2012)036, arxiv: 1111.1336
• Masahiro Kawasaki, Takeshi Kobayashi, Fuminobu Takahashi, Non-Gaussianity from Curvatons Revisited, Phys.Rev.D84:123506,2011, arxiv: 1107.6011
• Isocurvature Constraints and Anharmonic Effects on QCD Axion Dark Matter, Takeshi Kobayashi, Ryosuke Kurematsu, Fuminobu Takahashi, arxiv: 1304.0922
• Spectator field models in light of spectral index after Planck, Takeshi Kobayashi, Fuminobu Takahashi, Tomo Takahashi, Masahide Yamaguchi, arxiv: 1303.6255
• Large Tensor-to-Scalar Ratio in Small-Field Inflation, Takeshi Kobayashi, Tomo Takahashi, arxiv: 1303.0242

Seminars

• Density Perturbations from Curvatons Revisited, McGill University
• Density Perturbations from Curvatons Revisited, PASCOS 2012, Merida, Mexico
• Perturbation Generating Mechanisms and Weird Signals in the Sky, RESCEU, Tokyo University
• Density Perturbations from Curvatons Revisited, 5th Conference on String and Cosmology, Oita, Japan
• Generation of Density Perturbations in Inflationary Cosmology, Tokyo University
• D-Brane Inflation in String Cosmology, Toronto University
• PIRSA:12040058, Density Perturbations from Curvatons Revisited, 2012-04-24, Cosmology & Gravitation