Research Support

New low-energy effective theory emerging from superstring theory

Project Gist

Start a revolution in String Theory by taking a new supergravity as the start


String Theory, Gravity, Quantum Field Theory, Gauge/gravity correspondence

Background and Purpose

Supergravities, which are regarded as low-energy effective theories, have been studied for long time. In 2016, Tseytlin and Wulff pointed out an interesting possibility that one might have missed an ingredient in the study of supergravities. It may be rather natural to include “a new background field” as well as the usual matter contents, and then the resulting low-energy effective theory becomes “a generalized supergravity”. This discovery should be regarded as one of the most significant and fundamental progress on the foundation of String Theory itself and it is an issue of burning concern to clarify the physics related to the appearance of this new background field.

Project Achievements

Thanks to the support by the SPIRITS program, we have succeeded in getting a deeper understanding for the quantum consistency condition in string theories defined on solutions of a generalized supergravity. Then our result has been published in Physical Review Letters. In addition, my research proposal to a research budget, Grant-in-Aid for Scientific Research (B) has been accepted thanks to a great research achievement obtained by the SPIRITS support, and I have hired Dr. Takaaki Ishii as a postdoctoral researcher in our group. He was able to get precious experience as a PM type leader via the activities concerned with this SPIRITS project.

Future Prospects

A new research proposal has been accepted as a new project in the SPIRITS (international-type). I would like to keep and sustain the international communication network established by the present SPIRITS project and expand it furthermore. I also try to make a step-up from Grant-in-Aid for Scientific Research (B) to the one (A).


A formula relating a characteristic quantity in a generalized supergravity and space-time non-commutativity
A group photo in the international workshop “Non-Perturbative Methods in Field Theory and String Theory” in October 2018

Joint Research/Academic Institutions Abroad

University of Bern, Asia Pacific Center for Theoretical Physics, National Taiwan University, National Center for Theoretical Sciences, University of Wrocław, University of Warsaw, Heriot-Watt University, University of Vienna, Groningen University, Institute for Research in Fundamental Sciences, Ecole Normale Superieure, Landau Institute for Theoretical Physics, Sogang University, University of York, University of Murcia

Principal Investigator

YOSHIDA Kentaroh

・YOSHIDA Kentaroh
・Graduate School of Science
・His specialty is theoretical particle physics, and his main research fields are String Theory and its mathematical nature. One of his recent research interests is to study the quantum consistency of string theories defined on solutions of a generalized supergravity. His hobbies are bowling and karaoke.