＜＜＜「@」を「__AT__」に置き換えています＞＞＞
To: sg-l
Date: Mon, 23 Jun 2025 14:35:00 +0000
Subject: [Sg-l:9478] Philipp Höhn氏による集中講義 (9月24, 25, 26日)__AT__ 理研和光キャンパス/8th Intensive Lectures by Quantum Gravity Gatherings __AT__ RIKEN Wako
From: Yuki Yokokura (Sg-l 経由)
みなさま （English announcement follows Japanese one）
理研iTHEMSのQuantum Gravity Gatherings（http://qgg.riken.jp ）による集中講義シリーズの第８弾のお知らせです。
第８回集中講義（9月24～26日＠理研和光キャンパス）では、Philipp Höhn氏（OIST）をきして、 Quantum Reference Framesを基本的なところから最近の応用までお話してもらいます（詳細は以下の英語版をご覧ください）。日本でQuantum Reference Framesを学ぶ絶好のチャンスです。
（なお、これは１０月にOISTで開催されるQRF 2025 workshop https://www.oist.jp/conference/qrf-2025 のジョイントイベントです。この集中講義と合わせて参加するのが効果的です。）
講義形式は対面での板書（オンライン配信なし）、基本言語は英語です。この集中講義は参加型のイベントとすることを意図し、活発でオープンな議論が育むため、参加者誰もがショートトークを行えるセッション・少し長めの休憩時間・バンケット（１日目夜）を用意してあります。
ウェブサイト： https://qgg.riken.jp/session8.htm
講師：Philipp Höhn (OIST)
タイトル：Quantum Reference Frames and Their Applications in High-Energy Physics.
日時：2025年9月24日（水）～26日（金）
場所：理研和光キャンパス、研究本館4階435～437号室
申込みフォーム： https://forms.gle/HEGmFBjYLtTyXHQB8
締切：9月7日（日）
皆様のご参加をお待ちしております。
QGG世話人を代表して
Puttarak Jai-akson, 横倉祐貴
QGG世話人：Che-Yu Chen（iTHEMS）、濱田雄太（KEK）、Puttarak Jai-akson（iTHEMS）、Christy Kelly（iTHEMS）、難波亮（iTHEMS）、野海俊文（東大）、大下翔誉（京大白眉/iTHEMS）、杉下宗太郎（京大/iTHEMS）、横倉祐貴（iTHEMS）
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Dear ALL,
This is an announcement of the 8th event of intensive lecture series by Quantum Gravity Gatherings Study Group (http://qgg.riken.jp) at RIKEN iTHEMS (https://ithems.riken.jp/en).
This time, Prof. Philipp Höhn (OIST) will give a lecture series on Quantum reference frames and their applications in high-energy physics, at RIKEN Wako campus on September 24 (Wednesday) - 26 (Friday).
Quantum reference frames (QRFs) are quantum subsystems that transform non-trivially under relevant symmetry groups, replacing external classical frames with internal, relational ones that can exist in superposition, become entangled, and evolve dynamically. This perspective ultimately seeks to formulate a quantum relativity principle that may reveal the quantum structure of spacetime, offering a new lens on quantum covariance with far-reaching implications for quantum foundations and high-energy physics. As QRFs are a relatively new concept, we believe this lecture series will offer fresh perspectives to researchers across diverse fields and may open possibilities for applying these ideas to their own research and studies.
Participants may also be interested in the QRF 2025 workshop (https://www.oist.jp/conference/qrf-2025) by Prof. Höhn's group, Qubits & Spacetime Unit in OIST. This lecture series is being held as a joint event to complement and enrich the workshop experience.
The lectures are given in an English, blackboard-style (without online broadcasting), to encourage active Q&A discussions in a casual and dynamic atmosphere. In addition, there will be a session where any interested participant can give a short talk on any topic of their choice, which is intended to help spark interactions among all the participants. We hope that this event may be of interest to people with diverse research expertise and that it will create a lively environment for fruitful interactions and idea exchange.
Please see below for details.
Website: https://qgg.riken.jp/session8.htm
Lecturer: Prof. Philipp Höhn (OIST)
Title: Quantum reference frames and their applications in high-energy physics
Abstract:
Quantum reference frames (QRFs) are a universal tool for dealing with symmetries in quantum systems. Roughly speaking, they are internal subsystems that transform in some non-trivial way under the symmetry group of interest and constitute the means for describing quantum systems “from the inside” in purely relational terms. QRFs are thus crucial for describing and extracting physics whenever no external reference frame for the symmetry group is available. This is in particular the case when the symmetries are gauge, as in gauge theory and gravity, where QRFs arise whenever building physical observables. The choice of internal QRF is typically non-unique, giving rise to a novel quantum form of covariance of physical properties under QRF transformations. This lecture series will explore this novel perspective in detail with a specific emphasis on applications in high-energy physics and gravity.
I will begin by introducing QRFs in mechanical setups and explain how they give rise to quantum structures of covariance that mimic those underlying special relativity. I will explain how this leads to subsystem relativity, the insight that different QRF decompose the total system in different ways into gauge-invariant subsystems, and how this leads to the QRF dependence of correlations, entropies, and thermal properties. We will then explore how relational dynamics in Hamiltonian constrained systems and the infamous "problem of time" can be addressed with clocks identified as temporal QRFs. In transitioning to the field theory setting, we will first consider hybrid scenarios, where QRFs are quantum mechanical, but the remaining degrees of freedom are quantum fields including gravitons. I will explain how this encompasses the recent discussion of "observers", generalized entropies, and gravitational von Neumann algebras by Witten et al. and how subsystem relativity leads to the conclusion that gravitational entanglement entropies are observer dependent. We will then discuss the classical analog of QRFs in gauge theory and gravity and how they can be used to build gauge-invariant relational observables and to describe local subsystems. This will connect with discussions on edge and soft modes in the literature, the former of which turn out to be QRFs as well. This has bearing on entanglement entropies in gauge theories, which I will describe on the lattice, providing a novel relational construction that overcomes the challenges faced by previous constructions, which yielded non-distillable contributions to the entropy and can be recovered as the intersection of "all QRF perspectives". Finally, I will describe how the classical discussion of dynamical reference frames can be used to build a manifestly gauge-invariant path integral formulation that opens up novel relational perspectives on effective actions and the renormalization group in gravitational contexts, which is typically plagued by a lack of manifest diffeomorphism-invariance. I will conclude with open questions and challenges in the field.
Dates: September 24 (Wed.) - 26 (Fri.), 2025
Place: RIKEN Wako campus (Room #435-437, 4F, Main Research Building)
Registration: https://forms.gle/HEGmFBjYLtTyXHQB8
* Due date: September 7th (Sunday).
*
- We might close the registration prior to the deadline if and when the number of registered participants exceeds the event room capacity.
* - Participants are encouraged to give a short talk on any topic of their choice. This is designed to foster a lively and engaging environment, facilitating increased communication and knowledge exchange among all participants.
* - Giving a short talk is mandatory for those receiving support and for students attending the banquet.
* - We can provide a limited number of the apartments. Note that the check-in date is fixed for September 23rd and the check-out date is fixed for September 26th (no changes allowed).
We look forward to seeing you all at the lectures!
Sincerely,
Puttarak Jai-akson, Yuki Yokokura
On behalf of QGG facilitators:
Che-Yu Chen (iTHEMS), Yuta Hamada (KEK), Puttarak Jai-akson (iTHEMS), Christy Koji Kelly (iTHEMS), Ryo Namba (iTHEMS), Toshifumi Noumi (University of Tokyo), Naritaka Oshita (Kyoto Hakubi/iTHEMS), Sotaro Sugishita (Kyoto University/iTHEMS), Yuki Yokokura (iTHEMS)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
To: sg-l
Date: Sun, 10 Aug 2025 05:55:41 +0000
Subject: [Sg-l:9608] [Reminder] Philipp Höhn氏による集中講義 (9月24, 25, 26日)__AT__ 理研和光キャンパス/8th Intensive Lectures by Quantum Gravity Gatherings __AT__ RIKEN Wako
From: Yuki Yokokura (Sg-l 経由)
みなさま
9月24～26日に理研和光キャンパスにて行われるPhilipp Höhn氏（OIST）による集中講義「Quantum Reference Frames」のリマインダです。
既に多くの参加者に申し込んでいただき、ありがとうございます。多数の分野・国からの参加者がおり、議論が盛り上がることが予想されます。Quantum Reference Framesを基本的なところから系統的に学ぶ絶好のチャンスです。ぜひ参加をご検討下さい。
ウェブサイト： https://qgg.riken.jp/session8.htm
講師：Philipp Höhn (OIST)
タイトル：Quantum Reference Frames and Their Applications in High-Energy Physics.
日時：2025年9月24日（水）～26日（金）
場所：理研和光キャンパス、研究本館4階435～437号室
申込みフォーム： https://forms.gle/HEGmFBjYLtTyXHQB8
申込み締切：9月7日（日）
QGG世話人を代表して
Puttarak Jai-akson, 横倉祐貴
QGG世話人：Che-Yu Chen（iTHEMS）、濱田雄太（KEK）、Puttarak Jai-akson（iTHEMS）、Christy Kelly（iTHEMS）、難波亮（iTHEMS）、野海俊文（東大）、大下翔誉（京大白眉/iTHEMS）、杉下宗太郎（京大/iTHEMS）、横倉祐貴（iTHEMS）
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Dear ALL,
This is an announcement of the 8th event of intensive lecture series by Quantum Gravity Gatherings Study Group (http://qgg.riken.jp) at RIKEN iTHEMS (https://ithems.riken.jp/en).
This time, Prof. Philipp Höhn (OIST) will give a lecture series on Quantum reference frames and their applications in high-energy physics, at RIKEN Wako campus on September 24 (Wednesday) - 26 (Friday).
Quantum reference frames (QRFs) are quantum subsystems that transform non-trivially under relevant symmetry groups, replacing external classical frames with internal, relational ones that can exist in superposition, become entangled, and evolve dynamically. This perspective ultimately seeks to formulate a quantum relativity principle that may reveal the quantum structure of spacetime, offering a new lens on quantum covariance with far-reaching implications for quantum foundations and high-energy physics. As QRFs are a relatively new concept, we believe this lecture series will offer fresh perspectives to researchers across diverse fields and may open possibilities for applying these ideas to their own research and studies.
Participants may also be interested in the QRF 2025 workshop (https://www.oist.jp/conference/qrf-2025) by Prof. Höhn's group, Qubits & Spacetime Unit in OIST. This lecture series is being held as a joint event to complement and enrich the workshop experience.
The lectures are given in an English, blackboard-style (without online broadcasting), to encourage active Q&A discussions in a casual and dynamic atmosphere. In addition, there will be a session where any interested participant can give a short talk on any topic of their choice, which is intended to help spark interactions among all the participants. We hope that this event may be of interest to people with diverse research expertise and that it will create a lively environment for fruitful interactions and idea exchange.
Please see below for details.
Website: https://qgg.riken.jp/session8.htm
Lecturer: Prof. Philipp Höhn (OIST)
Title: Quantum reference frames and their applications in high-energy physics
Abstract:
Quantum reference frames (QRFs) are a universal tool for dealing with symmetries in quantum systems. Roughly speaking, they are internal subsystems that transform in some non-trivial way under the symmetry group of interest and constitute the means for describing quantum systems “from the inside” in purely relational terms. QRFs are thus crucial for describing and extracting physics whenever no external reference frame for the symmetry group is available. This is in particular the case when the symmetries are gauge, as in gauge theory and gravity, where QRFs arise whenever building physical observables. The choice of internal QRF is typically non-unique, giving rise to a novel quantum form of covariance of physical properties under QRF transformations. This lecture series will explore this novel perspective in detail with a specific emphasis on applications in high-energy physics and gravity.
I will begin by introducing QRFs in mechanical setups and explain how they give rise to quantum structures of covariance that mimic those underlying special relativity. I will explain how this leads to subsystem relativity, the insight that different QRF decompose the total system in different ways into gauge-invariant subsystems, and how this leads to the QRF dependence of correlations, entropies, and thermal properties. We will then explore how relational dynamics in Hamiltonian constrained systems and the infamous "problem of time" can be addressed with clocks identified as temporal QRFs. In transitioning to the field theory setting, we will first consider hybrid scenarios, where QRFs are quantum mechanical, but the remaining degrees of freedom are quantum fields including gravitons. I will explain how this encompasses the recent discussion of "observers", generalized entropies, and gravitational von Neumann algebras by Witten et al. and how subsystem relativity leads to the conclusion that gravitational entanglement entropies are observer dependent. We will then discuss the classical analog of QRFs in gauge theory and gravity and how they can be used to build gauge-invariant relational observables and to describe local subsystems. This will connect with discussions on edge and soft modes in the literature, the former of which turn out to be QRFs as well. This has bearing on entanglement entropies in gauge theories, which I will describe on the lattice, providing a novel relational construction that overcomes the challenges faced by previous constructions, which yielded non-distillable contributions to the entropy and can be recovered as the intersection of "all QRF perspectives". Finally, I will describe how the classical discussion of dynamical reference frames can be used to build a manifestly gauge-invariant path integral formulation that opens up novel relational perspectives on effective actions and the renormalization group in gravitational contexts, which is typically plagued by a lack of manifest diffeomorphism-invariance. I will conclude with open questions and challenges in the field.
Dates: September 24 (Wed.) - 26 (Fri.), 2025
Place: RIKEN Wako campus (Room #435-437, 4F, Main Research Building)
Registration: https://forms.gle/HEGmFBjYLtTyXHQB8
* Due date: September 7th (Sunday).
* - We might close the registration prior to the deadline if and when the number of registered participants exceeds the event room capacity.
* - Participants are encouraged to give a short talk on any topic of their choice. This is designed to foster a lively and engaging environment, facilitating increased communication and knowledge exchange among all participants.
* - Giving a short talk is mandatory for those receiving support and for students attending the banquet.
* - We can provide a limited number of the apartments. Note that the check-in date is fixed for September 23rd and the check-out date is fixed for September 26th (no changes allowed).
We look forward to seeing you all at the lectures!
Sincerely,
Puttarak Jai-akson, Yuki Yokokura
On behalf of QGG facilitators:
Che-Yu Chen (iTHEMS), Yuta Hamada (KEK), Puttarak Jai-akson (iTHEMS), Christy Koji Kelly (iTHEMS), Ryo Namba (iTHEMS), Toshifumi Noumi (University of Tokyo), Naritaka Oshita (Kyoto Hakubi/iTHEMS), Sotaro Sugishita (Kyoto University/iTHEMS), Yuki Yokokura (iTHEMS)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
To: Sg L
Date: Fri, 5 Sep 2025 01:53:28 +0000
Subject: [Sg-l:9664] Philipp Höhn氏（OIST）による集中講義「Quantum Reference Frames」の最終リマインダ
From: Yuki Yokokura (Sg-l 経由)
みなさま
9月24～26日に理研和光キャンパスにて行われるPhilipp Höhn氏（OIST）による集中講義「Quantum Reference Frames」の最後のリマインダです。
申し込み締め切りは９月７日（日）ですので、まだ間に合います。
新しい視点を学ぶ良いチャンスです。この機会にぜひ！
ウェブサイト： https://qgg.riken.jp/session8.htm
講師：Philipp Höhn (OIST)
タイトル：Quantum Reference Frames and Their Applications in High-Energy Physics.
日時：2025年9月24日（水）～26日（金）
場所：理研和光キャンパス、研究本館4階435～437号室
申込みフォーム： https://forms.gle/HEGmFBjYLtTyXHQB8
申込み締切：9月7日（日）
QGG世話人を代表して
Puttarak Jai-akson, 横倉祐貴
QGG世話人：Che-Yu Chen（iTHEMS）、濱田雄太（KEK）、Puttarak Jai-akson（iTHEMS）、Christy Kelly（iTHEMS）、難波亮（iTHEMS）、野海俊文（東大）、大下翔誉（京大白眉/iTHEMS）、杉下宗太郎（京大/iTHEMS）、横倉祐貴（iTHEMS）
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Dear ALL,
This is an announcement of the 8th event of intensive lecture series by Quantum Gravity Gatherings Study Group (http://qgg.riken.jp) at RIKEN iTHEMS (https://ithems.riken.jp/en).
This time, Prof. Philipp Höhn (OIST) will give a lecture series on Quantum reference frames and their applications in high-energy physics, at RIKEN Wako campus on September 24 (Wednesday) - 26 (Friday).
Quantum reference frames (QRFs) are quantum subsystems that transform non-trivially under relevant symmetry groups, replacing external classical frames with internal, relational ones that can exist in superposition, become entangled, and evolve dynamically. This perspective ultimately seeks to formulate a quantum relativity principle that may reveal the quantum structure of spacetime, offering a new lens on quantum covariance with far-reaching implications for quantum foundations and high-energy physics. As QRFs are a relatively new concept, we believe this lecture series will offer fresh perspectives to researchers across diverse fields and may open possibilities for applying these ideas to their own research and studies.
Participants may also be interested in the QRF 2025 workshop (https://www.oist.jp/conference/qrf-2025) by Prof. Höhn's group, Qubits & Spacetime Unit in OIST. This lecture series is being held as a joint event to complement and enrich the workshop experience.
The lectures are given in an English, blackboard-style (without online broadcasting), to encourage active Q&A discussions in a casual and dynamic atmosphere. In addition, there will be a session where any interested participant can give a short talk on any topic of their choice, which is intended to help spark interactions among all the participants. We hope that this event may be of interest to people with diverse research expertise and that it will create a lively environment for fruitful interactions and idea exchange.
Please see below for details.
Website: https://qgg.riken.jp/session8.htm
Lecturer: Prof. Philipp Höhn (OIST)
Title: Quantum reference frames and their applications in high-energy physics
Abstract:
Quantum reference frames (QRFs) are a universal tool for dealing with symmetries in quantum systems. Roughly speaking, they are internal subsystems that transform in some non-trivial way under the symmetry group of interest and constitute the means for describing quantum systems “from the inside” in purely relational terms. QRFs are thus crucial for describing and extracting physics whenever no external reference frame for the symmetry group is available. This is in particular the case when the symmetries are gauge, as in gauge theory and gravity, where QRFs arise whenever building physical observables. The choice of internal QRF is typically non-unique, giving rise to a novel quantum form of covariance of physical properties under QRF transformations. This lecture series will explore this novel perspective in detail with a specific emphasis on applications in high-energy physics and gravity.
I will begin by introducing QRFs in mechanical setups and explain how they give rise to quantum structures of covariance that mimic those underlying special relativity. I will explain how this leads to subsystem relativity, the insight that different QRF decompose the total system in different ways into gauge-invariant subsystems, and how this leads to the QRF dependence of correlations, entropies, and thermal properties. We will then explore how relational dynamics in Hamiltonian constrained systems and the infamous "problem of time" can be addressed with clocks identified as temporal QRFs. In transitioning to the field theory setting, we will first consider hybrid scenarios, where QRFs are quantum mechanical, but the remaining degrees of freedom are quantum fields including gravitons. I will explain how this encompasses the recent discussion of "observers", generalized entropies, and gravitational von Neumann algebras by Witten et al. and how subsystem relativity leads to the conclusion that gravitational entanglement entropies are observer dependent. We will then discuss the classical analog of QRFs in gauge theory and gravity and how they can be used to build gauge-invariant relational observables and to describe local subsystems. This will connect with discussions on edge and soft modes in the literature, the former of which turn out to be QRFs as well. This has bearing on entanglement entropies in gauge theories, which I will describe on the lattice, providing a novel relational construction that overcomes the challenges faced by previous constructions, which yielded non-distillable contributions to the entropy and can be recovered as the intersection of "all QRF perspectives". Finally, I will describe how the classical discussion of dynamical reference frames can be used to build a manifestly gauge-invariant path integral formulation that opens up novel relational perspectives on effective actions and the renormalization group in gravitational contexts, which is typically plagued by a lack of manifest diffeomorphism-invariance. I will conclude with open questions and challenges in the field.
Dates: September 24 (Wed.) - 26 (Fri.), 2025
Place: RIKEN Wako campus (Room #435-437, 4F, Main Research Building)
Registration: https://forms.gle/HEGmFBjYLtTyXHQB8
* Due date: September 7th (Sunday).
* - We might close the registration prior to the deadline if and when the number of registered participants exceeds the event room capacity.
* - Participants are encouraged to give a short talk on any topic of their choice. This is designed to foster a lively and engaging environment, facilitating increased communication and knowledge exchange among all participants.
* - Giving a short talk is mandatory for those receiving support and for students attending the banquet.
* - We can provide a limited number of the apartments. Note that the check-in date is fixed for September 23rd and the check-out date is fixed for September 26th (no changes allowed).
We look forward to seeing you all at the lectures!
Sincerely,
Puttarak Jai-akson, Yuki Yokokura
On behalf of QGG facilitators:
Che-Yu Chen (iTHEMS), Yuta Hamada (KEK), Puttarak Jai-akson (iTHEMS), Christy Koji Kelly (iTHEMS), Ryo Namba (iTHEMS), Toshifumi Noumi (University of Tokyo), Naritaka Oshita (Kyoto Hakubi/iTHEMS), Sotaro Sugishita (Kyoto University/iTHEMS), Yuki Yokokura (iTHEMS)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
To: sg-l
Date: Thu, 25 Sep 2025 06:52:52 +0000
Subject: [Sg-l:9712] 川上則雄氏による集中講義 (11月19,20日)__AT__ 理研和光キャンパス/ 9th Intensive Lectures by Quantum Gravity Gatherings __AT__ RIKEN Wako
From: Yuki Yokokura (Sg-l 経由)
みなさま （English announcement follows Japanese one）
理研iTHEMSのQuantum Gravity Gatherings による集中講義シリーズの第９弾のお知らせです。
量子重力は未知の量子多体系であり、量子相関が非自明な役割をするはずです。それを物理的に研究する基礎として、物性系において量子相関の物理的描像を理解することは効果的だと考えられます。第９回集中講義では、川上則雄氏（理研）をお招きして、物性物理の典型例を通して量子多体系の相関効果についてお話ししてもらいます（詳細は以下の英語版をご覧ください）。
今回のイベントは理研FQSPとの共催であり、高エネルギー分野・物性分野・量子情報分野など幅広い分野の参加者をつなぐイベントとなっております。講義形式は対面での板書、基本言語は英語です。この集中講義は参加型のイベントとすることを意図し、活発でオープンな議論が育むため、参加者誰もがショートトークを行えるセッションを用意してあります。
ウェブサイト：Program webpage
講師：川上則雄 （理研）
タイトル：Correlation Effects in Quantum Many-Body Systems: Some Prototypical Examples in Condensed Matter Physics
日時：2025年11月19日（水）～20日（木）
場所：理研和光キャンパス、研究本館4階435号室
申込みフォーム： Click here
締切：10月23日（木）
皆様のご参加をお待ちしております。
Wei-Hsiang Shao, 横倉祐貴
QGG世話人：Che-Yu Chen（iTHEMS）、濱田雄太（KEK）、Puttarak Jai-akson（iTHEMS）、Christy Kelly（iTHEMS）、難波亮（iTHEMS）、野海俊文（東大）、大下翔誉（京大白眉/iTHEMS）、Wei-Hsiang Shao (iTHEMS)、杉下宗太郎（京大/iTHEMS）、横倉祐貴（KEK/iTHEMS）
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Dear all,
We are pleased to announce the 9th Intensive Lecture Series organized by the Quantum Gravity Gatherings (QGG) Study Group (http://qgg.riken.jp) at RIKEN iTHEMS (https://ithems.riken.jp/en).
This time, Prof. Norio Kawakami (RIKEN) will deliver a lecture series on quantum many-body systems:
Title: Correlation Effects in Quantum Many-Body Systems: Some Prototypical Examples in Condensed Matter Physics
Date: November 19–20, 2025
Venue: Rooms 435–437, 4F, Main Research Building, RIKEN Wako Campus
In recent years, ideas from quantum many-body physics have become increasingly relevant to quantum gravity, where correlation effects induced by gravity play important roles. By bridging perspectives from gravitational physics and many-body dynamics, we hope to better understand how macroscopic spacetime and its geometric properties emerge from the collective behavior of microscopic quantum constituents.
In this lecture series, Prof. Kawakami will introduce the fundamental aspects of correlation effects through representative examples in condensed matter physics. A distinctive feature of this event is its joint organization with the Fundamental Quantum Science Program (FQSP) at RIKEN. The goal is to strengthen connections between quantum gravity, condensed matter, and quantum information communities.
Title: Correlation Effects in Quantum Many-Body Systems: Some Prototypical Examples in Condensed Matter Physics
Abstract:
Some examples of theoretical methods to treat strongly correlated systems in condensed matter physics are explained. We start with the Kondo effect, which is one of the most fundamental quantum many-body problems and has been intensively studied to date in a wide variety of topics such as dilute magnetic alloys, heavy fermion systems, quantum dot systems, etc. Dynamical mean-field theory (DMFT) is then introduced, which enables us to systematically treat strongly correlated materials such as a Mott insulator. It is shown that the essence of DMFT is closely related to the Kondo effect. Furthermore, we explain how to apply conformal field theory (CFT) to treat correlation effects in one-dimensional electron systems.
Topics of these lectures include:
1. Introduction to quantum many-body systems in condensed matter physics
2. The Kondo effect: a prototypical quantum many-body problem
3. Dynamical mean-field theory: a generic method to study correlation effects
4. Application of CFT to correlated electron systems in one dimension
The lectures will be held in a blackboard-style format (in English) to encourage interaction, active participation, and in-depth Q&A. In addition, there will be short talk sessions, offering participants the chance to briefly present their own research and exchange ideas in a lively and informal setting.
Registration form: Click here (Deadline: October 23)
Event details: Program webpage
We look forward to your participation!
Sincerely,
Wei-Hsiang Shao, Yuki Yokokura
On behalf of the QGG facilitators:
Che-Yu Chen (RIKEN iTHEMS), Yuta Hamada (KEK), Puttarak Jai-akson (RIKEN iTHEMS), Christy Kelly (RIKEN iTHEMS), Ryo Namba (RIKEN iTHEMS), Toshifumi Noumi (The University of Tokyo), Naritaka Oshita (YITP / Hakubi – Kyoto University / RIKEN iTHEMS), Wei-Hsiang Shao (RIKEN iTHEMS), Sotaro Sugishita (Kyoto University / RIKEN iTHEMS), Yuki Yokokura (KEK / RIKEN iTHEMS)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Date: Thu, 16 Oct 2025 16:24:20 +0900
To: sg-l__AT__yukawa.kyoto-u.ac.jp
Subject: [Sg-l:9773] [再送] 川上則雄氏による集中講義 (11月19,20日)__AT__ 理研和光キャンパス/ 9th Intensive Lectures by Quantum Gravity Gatherings __AT__ RIKEN Wako
From: Yuki Yokokura (Sg-l 経由)
みなさま （English announcement follows Japanese one）
先日お知らせした、川上則雄氏による集中講義(11/19-20＠理研和光)の参加申し込み締め切りが来週（10/23）ですので、リマインドさせていただきます。
すでに多くの方に申し込んでいただき、ありがとうございます。
今回は特に幅広い分野の方々が参加されます。
集中講義と共に学際的交流の機会としても活用していただければ幸いです。
皆様のご参加をお待ちしております。
Wei-Hsiang Shao, 横倉祐貴
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
理研iTHEMSの*Quantum Gravity Gatherings *
による集中講義シリーズの第９弾のお知らせです。
量子重力は未知の量子多体系であり、量子相関が非自明な役割をするはずです。それを物理的に研究する基礎として、物性系において量子相関の物理的描像を理解することは効果的だと考えられます。第９回集中講義では、
*川上則雄*氏（理研）をお招きして、*物性物理の典型例を通して量子多体系の相関効果*についてお話ししてもらいます（詳細は以下の英語版をご覧ください）。
今回のイベントは*理研FQSP *
との共催であり、高エネルギー分野・物性分野・量子情報分野など幅広い分野の参加者をつなぐイベントとなっております。講義形式は対面での板書、基本言語は英語です。この集中講義は参加型のイベントとすることを意図し、活発でオープンな議論が育むため、参加者誰もがショートトークを行えるセッションを用意してあります。
*ウェブサイト：**Program webpage *
*講師：川上則雄 （理研）*
*タイトル：Correlation Effects in Quantum Many-Body Systems: Some Prototypical
Examples in Condensed Matter Physics*
*日時：2025年11月19日（水）～20日（木）*
*場所：理研和光キャンパス、研究本館4階435号室*
*申込みフォーム： **Click here *
*締切：10月23日（木）*
皆様のご参加をお待ちしております。
Wei-Hsiang Shao, 横倉祐貴
QGG世話人：Che-Yu Chen（iTHEMS）、濱田雄太（KEK）、Puttarak Jai-akson（iTHEMS）、Christy
Kelly（iTHEMS）、難波亮（iTHEMS）、野海俊文（東大）、大下翔誉（京大白眉/iTHEMS）、Wei-Hsiang Shao
(iTHEMS)、杉下宗太郎（京大/iTHEMS）、横倉祐貴（KEK/iTHEMS）
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Dear all,
We are pleased to announce the *9th Intensive Lecture Series* organized by
the *Quantum Gravity Gatherings (QGG)* Study Group (*http://qgg.riken.jp
*) at *RIKEN iTHEMS* (*https://ithems.riken.jp/en
*).
This time, *Prof. Norio Kawakami (RIKEN)* will deliver a lecture series on
quantum many-body systems:
*Title:* *Correlation Effects in Quantum Many-Body Systems: Some
Prototypical Examples in Condensed Matter Physics*
*Date:* November 19–20, 2025
*Venue:* Rooms 435–437, 4F, Main Research Building, RIKEN Wako Campus
In recent years, ideas from quantum many-body physics have become
increasingly relevant to quantum gravity, where correlation effects induced
by gravity play important roles. By bridging perspectives from
gravitational physics and many-body dynamics, we hope to better understand
how macroscopic spacetime and its geometric properties emerge from the
collective behavior of microscopic quantum constituents.
In this lecture series, Prof. Kawakami will introduce the fundamental
aspects of correlation effects through representative examples in condensed
matter physics. A distinctive feature of this event is its *joint
organization with the Fundamental Quantum Science Program (FQSP) at RIKEN*.
The goal is to strengthen connections between quantum gravity, condensed
matter, and quantum information communities.
*Title:* *Correlation Effects in Quantum Many-Body Systems: Some
Prototypical Examples in Condensed Matter Physics*
*Abstract:*
Some examples of theoretical methods to treat strongly correlated systems
in condensed matter physics are explained. We start with the *Kondo effect*,
which is one of the most fundamental quantum many-body problems and has
been intensively studied to date in a wide variety of topics such as dilute
magnetic alloys, heavy fermion systems, quantum dot systems, etc. *Dynamical
mean-field theory (DMFT)* is then introduced, which enables us to
systematically treat strongly correlated materials such as a Mott
insulator. It is shown that the essence of DMFT is closely related to the
Kondo effect. Furthermore, we explain how to apply *conformal field theory
(CFT)* to treat correlation effects in one-dimensional electron systems.
Topics of these lectures include:
1. Introduction to quantum many-body systems in condensed matter physics
2. The Kondo effect: a prototypical quantum many-body problem
3. Dynamical mean-field theory: a generic method to study correlation
effects
4. Application of CFT to correlated electron systems in one dimension
The lectures will be held in a *blackboard-style format (in English)* to
encourage interaction, active participation, and in-depth Q&A. In addition,
there will be *short talk sessions*, offering participants the chance to
briefly present their own research and exchange ideas in a lively and
informal setting.
*Registration form:* *Click here *
(Deadline: *October 23*)
*Event details:* *Program webpage *
We look forward to your participation!
Sincerely,
Wei-Hsiang Shao, Yuki Yokokura
On behalf of the QGG facilitators:
Che-Yu Chen (RIKEN iTHEMS), Yuta Hamada (KEK), Puttarak Jai-akson (RIKEN
iTHEMS), Christy Kelly (RIKEN iTHEMS), Ryo Namba (RIKEN iTHEMS), Toshifumi
Noumi (The University of Tokyo), Naritaka Oshita (YITP / Hakubi – Kyoto
University / RIKEN iTHEMS), Wei-Hsiang Shao (RIKEN iTHEMS), Sotaro
Sugishita (Kyoto University / RIKEN iTHEMS), Yuki Yokokura (KEK / RIKEN
iTHEMS)