HirosiFest @ Kavli IPMU

20 Oct 2022, 08:40 → 21 Oct 2022, 23:30 Asia/Tokyo

Lecture Hall (Kavli IPMU, Kashiwa, Japan)

Dates:  October 20-21, 2022
Venue: Kavli IPMU Lecture Hall, Kashiwa Campus

Overview: Prof. Hirosi Ooguri is one of the founding members of the Kavli IPMU and is currently the director of Kavli IPMU. He has made tremendous contributions in physics and mathematics and is one of the most outstanding researchers of his generation. He is turning sixty this year, and we would like to take this opportunity to celebrate his remarkable contributions in physics and mathematics, bringing together experts worldwide.

This conference is followed by another event in celebration of Prof. Ooguri's 60th birthday: HirosiFest @ Caltech, October 27-28, 2022.

The conference is primarily in an "on-site/in-person" format, but we are thinking of making this event into a hybrid format, where online participation is also available. 

Due to Covid-related restrictions of UTokyo and Kavli IPMU, we need to restrict the number of on-site participants to up to ~60 people. (Note added on October 4th: the number was ~30 people before, but now we can accommodate many more people on-site. If you registered previously for online participation and want to change to on-site participation, please modify your registration in the registration page.)

Invited speakers:

Koji Hashimoto (Kyoto) [canceled]
Hitoshi Murayama (UC Berkeley/Kavli IPMU)
Yu Nakayama (Rikkyo)
Yuji Okawa (Tokyo)
Takuya Okuda (Tokyo)
Eric Perlmutter (Saclay)
Sakura Schafer-Nameki (Oxford)
Ashoke Sen (ICTS)
Jaewon Song (KAIST)
Yuji Tachikawa (Kavli IPMU)
Tadashi Takayanagi (YITP, Kyoto)
Cumrun Vafa (Harvard)
Masahito Yamazaki (Kavli IPMU)

Session Chairs:

Simeon Hellerman (Kavli IPMU)
Takuya Okuda (Tokyo)
Jaewon Song (KAIST)
Yuji Tachikawa (Kavli IPMU)
Cumrun Vafa (Harvard)
Masahito Yamazaki (Kavli IPMU)

Organizing Committee:

Juan Maldacena (IAS)
David Simmons-Duffin (Caltech)
John H. Schwarz (Caltech)
Cumrun Vafa (Harvard)
Masahito Yamazaki (Kavli IPMU)

Address:
Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU),
the University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa City, Chiba 277-8583, Japan

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Countermeasure against Covid (as from October 11_2022).pdf

Group photo 1.pdf

Thursday, 20 October

08:40 → 09:10 Registration and covid test at reception

09:10 → 10:00 Cumrun Vafa (Harvard)

[chair: Masahito Yamazaki (Kavli IPMU)]

"Swampland and the Dark Sector"

Vafa.pdf

10:00 → 10:20 Break

10:20 → 11:10 Hitoshi Murayama (UC Berkeley/Kavli IPMU)

[chair: Masahito Yamazaki (Kavli IPMU)]

Murayama.pdf

11:10 → 11:40 Break

11:40 → 12:30 Jaewon Song (KAIST)

[chair: Yuji Tachikawa (Kavli IPMU)]

"a vs c in the 4d SCFT landscape"

The central charges of conformal field theories capture many interesting aspects of the dynamics. In this talk, I will discuss aspects of central charges in the landscape of 4d superconformal theories. We find that the scaling behavior of a and c for the large N limit of superconformal gauge theories (with simple gauge group) falls into two categories: O(N^2) and O(N). The O(N) theories exhibit a dense spectrum even in the BPS sector. We also find a large set of a=c SCFTs for a finite N, which poses an interesting question in view of holography. Some of these theories have a tantalizing connection to N=4 SYM theory and are also realizable in class S.

Song.pdf

12:30 → 12:35 Photo

12:35 → 14:00 Lunch

14:00 → 14:50 Masahito Yamazaki (Kavli IPMU)

[chair: Yuji Tachikawa (Kavli IPMU)]

Yamazaki.pdf

14:50 → 15:10 Break

15:10 → 16:00 Yu Nakayama (Rikkyo)

[chair: Takuya Okuda (Tokyo)]

"(Topological) Twist and Scale vs Conformal invariance"

(Topological) twisting a conformal field theory admits more deformations than its original theory. We argue that such deformations often lead to scale-invariant but non-conformal fixed points. One physical example is to allow spin-orbit interaction in the Heisenberg magnet, leading to scale-invariant but non-conformal Aharony-Fisher fixed point. We show similar examples in Euclidean M2-brane holography, where the self-dual field strength plays a prominent role.

Nakayama.pptx

16:00 → 16:10 Break

16:10 → 17:00 Ashoke Sen (ICTS)

[chair: Takuya Okuda (Tokyo)]

Sen.pdf

Friday, 21 October

09:00 → 09:50 Takuya Okuda (Tokyo)

[chair: Jaewon Song (KAIST)]

"Measurement-based quantum simulation of gauge theories"

Numerical simulation of lattice gauge theories is an indispensable tool in high energy physics, and their quantum simulation is expected to become a major application of quantum computers in the future. In this talk, I show that sequential single-qubit measurements with the bases adapted according to the former measurement outcomes can induce a deterministic Hamiltonian quantum simulation of abelian lattice gauge theories. This is a specialization of the so-called measurement-based quantum computation, with a resource state tailored to simulate a lattice gauge theory. The resource state has a symmetry-protected topological order with respect to generalized global symmetries that are related to the symmetries of the simulated gauge theories on the boundary. If time permits I will sketch imaginary-time quantum simulation and the relation of the resource state with the classical partition function. This talk is based on a work in progress with Hiroki Sukeno.

Okuda.pdf

09:50 → 10:10 Break

10:10 → 11:00 Tadashi Takayanagi (YITP, Kyoto)

[chair: Jaewon Song (KAIST)]

"CFT Dual of dS3 and Pseudo Entropy"

We propose a holographic duality for gravity on a three-
dimensional de Sitter space. This is essentially given by a k=-2 limit
of SU(2) WZW model. We show that this proposal reproduces the expected
free energy in de Sitter gravity. We also analyze the geodesic length in
the three dimensional de Sitter spacetime and argue that it is
interpreted as holographic pseudo entropy. We will also discuss a time-
like entanglement entropy in AdS/CFT which shares a similar property in
terms of pseudo entropy.

Takayanagi.pdf

11:00 → 11:30 Break

11:30 → 12:20 Yuji Okawa (Tokyo)

[chair: Simeon Hellerman (Kavli IPMU)]

Correlation functions of scalar field theories from homotopy algebras

When actions are written in terms of homotopy algebras such as A_infinity algebras and L_infinity algebras, expressions of on-shell scattering amplitudes in perturbation theory are universal for both string field theories and ordinary field theories. We thus expect that homotopy algebras can be useful in gaining insights into quantum aspects of string field theories from ordinary field theories. In addition to on-shell scattering amplitudes we find that correlation functions can also be described in terms of homotopy algebras, and in this talk we explain explicit expressions for correlation functions of scalar field theories using quantum A_infinity algebras presented in arXiv:2203.05366. Then we further discuss the application to the renormalization group.

Okawa.pdf

12:20 → 13:50 Lunch

13:50 → 14:40 Yuji Tachikawa (Kavli IPMU)

[chair: Simeon Hellerman (Kavli IPMU)]

On heterotic 6-branes "without vector structure"

Assuming that string theory has dynamical objects carrying all possible charges, there should be 6-branes in heterotic so(32) theory such that the gauge configuration on their radial direction S^2 is "without vector structure", i.e. is not an SO(32) gauge configuration. We discuss some of their curious features. This is a work in progress mainly with Kazuya Yonekura.

Tachikawa.pdf

14:40 → 15:10 Break

15:10 → 16:00 Sakura Schafer-Nameki (Oxford)

[chair: Cumrun Vafa (Harvard)]

"On Symmetries."

I will give a summary of some of the exciting recent developments on generalizations of symmetries in quantum field theories, most notably non-invertible or more generally categorical symmetries. For theories that have a string theoretic realization, I will discuss how these structures are implemented in this context and arise naturally e.g. in holographic or geometric realizations.

Schafer-Nameki.pdf

16:00 → 16:10 Break

16:10 → 17:00 Eric Perlmutter (Saclay)

[chair: Cumrun Vafa (Harvard)]

Features & Fantasies of Moduli Dependence in CFT

Perlmutter.pptx