Waseda Institute for Advanced Study (WIAS)Waseda University

Name

YAMADA, Yusuke

Degree

Ph.D. in Science

Status

Assistant Professor

HP (URL)

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Research Topic

Quantum field theory in nontrivial classical field backgrounds 

One of the biggest questions in physics is how our universe was born and how it evolved to the present one. The description of the evolution of the early universe requires not only the theory of general relativity, which describes the evolution of spacetime, but also quantum mechanics (quantum field theory), which describes microscopic physics. However, there exist several unsolved problems in the quantum field theory in strong gravitational field backgrounds. The purpose of my research is to establish the systematic method to describe quantum theory in non-trivial backgrounds, and to improve the description of the early universe physics. 

Monthly Spotlight

[Monthly Spotlight] is focusing on a researcher to introduce his/her research.
Systematically Describing Particle Production, the Riddle of the Universe’s Creation, Using the Stokes Phenomenon

Education and Academic Employment

2016. 3 Ph. D. in Science (Waseda university)
2016. 4 – 2016. 9 Research fellow at research and education center for natural sciences, Keio University
2016. 10 – 2019. 3 Research Fellow at Stanford Institute for Theoretical Physics, Stanford University
2019. 4 – 2022. 3 JSPS research fellow (PD) at Research Center for the Early Universe, University of Tokyo 

Fields of Research Interests

Particle cosmology, Quantum field theory 

Academic Publications

• “ⅡB String theory and Sequestered Inflation”, R. Kallosh, A. Linde, T. Wrase, Y. Yamada, Fortsch. Phys. 69 (2021) 11-12 2100127 
• “Superadiabatic basis in cosmological particle production: application to preheating”, Y. Yamada, JCAP 09 (2021) 009 
• “Stokes phenomenon and gravitational particle production – How to evaluate it in practice” S. Hashiba, Y. Yamada, JCAP 05 (2021) 022 
• “Supersymmetric anti-D3 brane action in the Kachru-Kallosh-Linde-Trivedi setup”, N. Cribiori, C. Roupec, T. Wrase, Y. Yamada, Phys. Rev. D 100 (2019) 6, 066001 
• “Hypernatural inflation”, A. Linde, D. Wang, Y. Welling, Y. Yamada, A. Achucarro, JCAP 07 (2018) 035  
• “anti-D3 induced geometric inflation” R. Kallosh, A. Linde, D. Roest, Y. Yamada, JHEP 07 (2017) 057  
• “Absence of U(1) Anomalous Superamplitude in N >5 supergravities ”, D. Z. Freedman, R. Kallosh, D. Murli, A. Van Proeyen. Y. Yamada, JHEP 05 (2017) 067 
• “Maximal Supersymmetry and B-Mode Targets”, R. Kallosh, A. Linde, T. Wrase, Y. Yamada, JHEP 04 (2017) 144  
• “Ghostbusters in higher derivative supersymmetric theories: who is afraid of propagating auxiliary fields?”, T. Fujimori, M. Nitta, Y. Yamada, JHEP 09 (2016) 106 
• “de Sitter vacuum from R² supergravity”, F. Hasegawa, Y. Yamada, Phys. Rev. D 92 (2015) 10, 105027  
• “component action of nilpotent multiplet coupled to matter in 4 dimensional N=1 supergravity”, F. Hasegawa, Y. Yamada, JHEP 10 (2015) 106 
• “Massive vector multiplet inflation with Dirac-Born-Infeld type action”, H. Abe, Y. Sakamura, Y. Yamada, Phys. Rev. D. 91 (2015) 12, 125042 
• “Impacts of supersymmetric higher derivative terms on inflation models in supergravity”, S. Aoki, Y. Yamada, JCAP 07 (2015) 020 

Other Interests

music

Affiliated Academic Organizations

The Physical Society of Japan 

Awards

11th Particle Physics Medal; Young Scientist Award of Japan Particle and Nuclear Forum