Fumiya Sano's website

PhD student in ScienceTokyo   /   Student Research Assistant in IBS CTPU-CGA

InspireHEP:   https://inspirehep.net/authors/2738053 

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Research Interests

Keywords:   Astrophysics, Cosmology, Particle physics, Theories beyond the Standard Model, Inflation, Non-Gaussian perturbations, QFT in curved spacetime, Cosmological correlators, Cosmological collider, Quantumness of gravity in de Sitter spacetime

I mainly work on inflationary cosmology, especially non-linear effects of cosmological perturbations, using quantum field theory in de Sitter spacetime. I am interested in cosmological approaches to theories beyond the Standard Model (BSM) and the quantum nature of gravity, in addition to the origin of the Universe.

Planck collaboration revealed that slow-roll inflation explains cosmological scalar perturbations very well at the linear level (i.e., Gaussian level). However, many inflationary models can explain the observational result since the dominant signal at the linear order is free propagation. As a next step, we are now on the stage for exploring "the Standard Model of inflation" by going into interactions of scalar perturbations as well as the linear order of tensor perturbations, which may be read off from near-future observational projects such as LiteBIRD, CMB-S4, and various telescopes for probing large scale structures. Specifically, there has been a growing interest in an approach dabbed as the cosmological collider (CC) program. This program aims to make a theoretical dictionary for BSM particles/interactions appearing in non-Gaussian observational signals. Importantly, because of the possibly high energy scale during inflation, we expect the CC program to be a strong complement to the collider experiments on the ground.

Despite the clear motivations, it is technically difficult to derive analytical formulae for inflationary correlation functions with inflaton-massive particle interactions. To address this problem, people have started applying techniques developed in Minkowski spacetime and anti-de Sitter spacetime to (quasi-)de Sitter spacetime. It is noteworthy that these broader-perspective studies lead to investigating the nature of quantum fields in curved spacetime, which would provide us not only technical understanding for analytical calculations, but also some sophisticated methods to constrain UV physics using inflation as IR effective theory, such as the "scattering amplitude" approach.

Profile

Hello!!

My name is Fumiya Sano (佐野 文哉).

I was born and grew up in Yokohama, Japan; I am a Japanese citizen.

My current position is a PhD student at Institute of Science Tokyo (ScienceTokyo, formerly Tokyo Institute of Technology), Tokyo, Japan.

Currently (and probably during my PhD course), I am visiting Cosmology, Gravity and Astroparticle Physics Group, Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS CTPU-CGA), Daejeon, Korea.

Contact Information

sanof.cosmo@gmail.com (main)

sano@ibs.re.kr (IBS)

sano@th.phys.titech.ac.jp (ScienceTokyo)

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