Researcher Profile - SUZUKI Kenta

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SUZUKI Kenta

*Items subject to periodic update by Rikkyo University (The rest are reprinted from information registered on researchmap.)

Affiliation*

College of Science Department of Physics

Title*

Assistant Professor

Courses in charge*

Academic Year 2024

Campus Career*

9 2022 - Present

College of Science Department of Physics Assistant Professor

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Research History

9 2024 - Present

The University of Tokyo Graduate School of Arts and Sciences Assistant Professor

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Country：Japan

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9 2022 - 8 2024

Rikkyo University College of Science Department of Physics Assistant Professor

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Country：Japan

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4 2021 - 8 2022

Kyoto University Yukawa Institute for Theoretical Physics

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Country：Japan

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9 2018 - 3 2021

Ecole Polytechnique CPHT Postdoctoral Researcher

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Country：France

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Papers

Gauge symmetries and conserved currents in AdS/BCFT Peer-reviewed

Kenta Suzuki

Journal of High Energy Physics2024 ( 6 ) 19 6 2024

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

In this paper, we study massless/massive vector and p-form field perturbations in AdS spacetime with an end-of-the-world brane. By imposing Υ(1) preserving Neumann boundary condition on the end-of-the-world brane, we study their spectrum and discuss their implications for dual BCFT operators. When the perturbation is massless, the dual BCFT operator is a conserved current and we show that such an operator indeed satisfies the Υ(1) preserving conformal boundary condition. On the other hand, when the perturbation is massive, in general there exists non-vanishing perpendicular components of the dual BCFT operator, even in the massless limit. We explain this difference between massless and massive perturbations from the point of view of the bulk gauge symmetry, or equivalently from different structure of equations of motion. We also find several brane-tension-independent modes in massless perturbations, and these are understood as boundary-condition-independent modes from the dual BCFT point of view.

DOI： 10.1007/jhep06(2024)137

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Other Link： https://link.springer.com/article/10.1007/JHEP06(2024)137/fulltext.html
Dimensional reduction of the S3/WZW duality Peer-reviewed

Kenta Suzuki, Yusuke Taki

Journal of High Energy Physics2024 ( 3 ) 15 3 2024

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

Recently proposed duality relates the critical level limit $$\widehat{k}\to -2$$ of $${\text{SU } }{\left(2\right)}_{\widehat{k } }$$ WZW models to a classical three-dimensional Einstein gravity on a sphere. In this paper, we propose a dimensional reduced version of this duality. The gravity side is reduced to a Jackiw-Teitelboim (JT) gravity on S2 with a non-standard boundary term, or a BF theory with SU(2) gauge symmetry. At least in low temperature limit, these two-dimensional gravity theories completely capture the original three-dimensional gravity effect. The CFT side is reduced to a certain complex Liouville quantum mechanics (LQM) with SU(2) gauge symmetry. Our proposal gives an interesting example of a holography without boundary. We also discuss a higher-spin generalization with SU(N) gauge symmetry.

DOI： 10.1007/jhep03(2024)103

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Other Link： https://link.springer.com/article/10.1007/JHEP03(2024)103/fulltext.html
Correlators of double scaled SYK at one-loop Peer-reviewed

Kazumi Okuyama, Kenta Suzuki

Journal of High Energy Physics2023 ( 5 ) 15 5 2023

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

In this paper, we study one-loop contributions in the double-scaling limit of the SYK model from the chord diagrams and Liouville type effective action. We compute and clarify the meaning of each component consisting of the one-loop corrections for the two- and time-ordered four-point functions of light operators. We also reproduce the exact expression of the out-of-time-ordered four-point function at arbitrary temperatures within the one-loop level, which were previously computed from different methods.

DOI： 10.1007/jhep05(2023)117

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Other Link： https://link.springer.com/article/10.1007/JHEP05(2023)117/fulltext.html
Information metric on the boundary Peer-reviewed

Kenta Suzuki, Yu-ki Suzuki, Takashi Tsuda, Masataka Watanabe

Journal of High Energy Physics2023 ( 5 ) 2 5 2023

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

The information metric on the space of boundary coupling constants in two-dimensional conformal field theories is studied. Such a metric is related to the Casimir energy difference of the theory defined on an interval. We concretely compute the information metric on the boundary conformal manifold of free boson CFT as well as SU(2)k WZW theory, obtaining the result expected from the symmetry of the systems. We also compute the information metric on the space of non-conformal boundary states produced by boundary mass perturbations in the theory of a real free scalar. The holographic dual of the boundary information metric in the context of AdS3/BCFT2 is also discussed. We argue that it corresponds to the area of the minimal cross section of the end-of-the-world brane connecting two boundaries of the asymptotic BCFTs.

DOI： 10.1007/jhep05(2023)013

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Other Link： https://link.springer.com/article/10.1007/JHEP05(2023)013/fulltext.html
Brane dynamics of holographic BCFTs Peer-reviewed

Keisuke Izumi, Tetsuya Shiromizu, Kenta Suzuki, Tadashi Takayanagi, Norihiro Tanahashi

Journal of High Energy Physics2022 ( 10 ) 7 10 2022

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

In this paper we study various dynamical aspects of the AdS/BCFT correspondence in higher dimensions. We study properties of holographic stress energy tensor by analyzing the metric perturbation in the gravity dual. We also calculate the stress energy tensor for a locally excited state on a half plane in a free scalar CFT. Both of them satisfy a reflective boundary condition that is expected for any BCFTs. We also study the behavior of the scalar field perturbation in the AdS/BCFT setup and show that they also show complete reflections. Moreover, we find that the entanglement entropy of a BCFT computed from the AdS/BCFT matched with that calculated from the Island formula, which supports the Island/BCFT correspondence in higher dimensions. Finally we show how we can calculate one point functions in a BCFT in our gravity dual.

DOI： 10.1007/jhep10(2022)050

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Other Link： https://link.springer.com/article/10.1007/JHEP10(2022)050/fulltext.html
Factorizing wormholes in a partially disorder-averaged SYK model Peer-reviewed

Kanato Goto, Kenta Suzuki, Tomonori Ugajin

Journal of High Energy Physics2022 ( 9 ) 8 9 2022

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

In this paper, we introduce a “partially disorder-averaged” SYK model. This model has a real parameter that smoothly interpolates between the ordinary totally disorder-averaged SYK model and the totally fixed-coupling model. For the large N effective description, in addition to the usual bi-local collective fields, we also introduce a new additional set of local collective fields. These local fields can be understood as “half” of the bi-local collective fields, and in the totally fixed-coupling limit, they represent the “half-wormholes” which were found in recent studies. We find that the large N saddles of these local fields vanish in the total-disorder-averaged limit, while they develop nontrivial profiles as we gradually fix the coupling constants. We argue that the bulk picture of these local collective fields represents a correlation between a spacetime brane and the asymptotic AdS boundary. This illuminates how the half-wormhole saddles emerge in the SYK model with fixed couplings.

DOI： 10.1007/jhep09(2022)069

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Other Link： https://link.springer.com/article/10.1007/JHEP09(2022)069/fulltext.html
BCFT and Islands in two dimensions Peer-reviewed

Kenta Suzuki, Tadashi Takayanagi

Journal of High Energy Physics2022 ( 6 ) 6 2022

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

By combining the AdS/BCFT correspondence and the brane world holography, we expect an equivalence relation between a boundary conformal field theory (BCFT) and a gravitational system coupled to a CFT. However, it still remains unclear how the boundary condition of the BCFT is translated in the gravitational system. We examine this duality relation in a two-dimensional setup by looking at the computation of entanglement entropy and energy flux conservation. We also identify the two-dimensional gravity which is dual to the boundary dynamics of a BCFT. Moreover, we show that by considering a gravity solution with scalar fields turned on, we can reproduce one point functions correctly in the AdS/BCFT.

DOI： 10.1007/jhep06(2022)095

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Other Link： https://link.springer.com/article/10.1007/JHEP06(2022)095/fulltext.html
JT gravity limit of Liouville CFT and matrix model Peer-reviewed

Kenta Suzuki, Tadashi Takayanagi

Journal of High Energy Physics2021 ( 11 ) 11 2021

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

<title>A<sc>bstract</sc>
</title>In this paper we study a connection between Jackiw-Teitelboim (JT) gravity on two-dimensional anti de-Sitter spaces and a semiclassical limit of <italic>c <</italic> 1 two-dimensional string theory. The world-sheet theory of the latter consists of a space-like Liouville CFT coupled to a non-rational CFT defined by a time-like Liouville CFT. We show that their actions, disk partition functions and annulus amplitudes perfectly agree with each other, where the presence of boundary terms plays a crucial role. We also reproduce the boundary Schwarzian theory from the Liouville theory description. Then, we identify a matrix model dual of our two-dimensional string theory with a specific time-dependent background in <italic>c</italic> = 1 matrix quantum mechanics. Finally, we also explain the corresponding relation for the two-dimensional de-Sitter JT gravity.

DOI： 10.1007/jhep11(2021)137

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Other Link： https://link.springer.com/article/10.1007/JHEP11(2021)137/fulltext.html
Hydrodynamic Diffusion and Its Breakdown near AdS2 Quantum Critical Points Peer-reviewed

Daniel Areán, Richard A. Davison, Blaise Goutéraux, Kenta Suzuki

Physical Review X11 ( 3 ) 29 7 2021

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Publishing type：Research paper (scientific journal) Publisher：American Physical Society (APS)

DOI： 10.1103/physrevx.11.031024

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevX.11.031024/fulltext
Jackiw-Teitelboim quantum gravity with defects and the Aharonov-Bohm effect Peer-reviewed

Eric Mefford, Kenta Suzuki

Journal of High Energy Physics2021 ( 5 ) 5 2021

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

<title>A<sc>bstract</sc>
</title>We study the theory of Jackiw-Teitelboim gravity with generalized dilaton potential on Euclidean two-dimensional negatively curved backgrounds. The effect of the generalized dilaton potential is to induce a conical defect on the two-dimensional manifold. We show that this theory can be written as the ordinary quantum mechanics of a charged particle on a hyperbolic disk in the presence of a constant background magnetic field plus a pure gauge Aharonov-Bohm field. This picture allows us to exactly calculate the wavefunctions and propagators of the corresponding gravitational dynamics. With this method we are able to reproduce the gravitational density of states as well as compute the Réyni and entanglement entropies for the Hartle-Hawking state. While we reproduce the classical entropy at high temperature, we also find an extra topological contribution that becomes dominant at low temperatures. We then show how the presence of defects modify correlation functions, including the out-of-time-ordered correlation, and decrease the Lyapunov exponent. This is achieved two ways: by directly quantizing the boundary Schwarzian theory and by dimensionally reducing SL(2<italic>,</italic> ℤ) black holes.

DOI： 10.1007/jhep05(2021)026

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Other Link： https://link.springer.com/article/10.1007/JHEP05(2021)026/fulltext.html
Near conformal perturbation theory in SYK type models Peer-reviewed

Sumit R. Das, Animik Ghosh, Antal Jevicki, Kenta Suzuki

Journal of High Energy Physics2020 ( 12 ) 12 2020

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

<title>A<sc>bstract</sc>
</title>We present a systematic procedure to extract the dynamics of the low energy soft mode in SYK type models with a single energy scale <italic>J</italic> and emergent reparametrization symmetry in the IR. This is given in the framework of the perturbative scheme of arXiv:1608.07567 based on a specific (off-shell) breaking of conformal invariance in the UV, adjusted to yield the exact large-<italic>N</italic> saddle point. While this breaking term formally vanishes on-shell, it has a non-trivial effect on correlation functions and the effective action. In particular, it leads to the Schwarzian action with a specific coupling to bi-local matter. The method is applied to the evaluation of <italic>O</italic>(1) corrections to the correlation function of bi-locals. As a byproduct we confirm precise agreement with the explicit, symmetry breaking procedure. We provide a verification in the large <italic>q</italic> limit (Liouville theory), where the correlators can be calculated exactly at all length scales. In this case, our scheme illuminates how the enhanced <italic>O</italic>(<italic>J</italic>) and the subleading <italic>O</italic>(1) contributions originate from the Schwarzian dynamics of the soft mode and its interaction with <italic>h</italic> = 2 (bi-local) matter.

DOI： 10.1007/jhep12(2020)171

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Other Link： http://link.springer.com/article/10.1007/JHEP12(2020)171/fulltext.html
Long-range multi-scalar models at three loops Peer-reviewed

Dario Benedetti, Razvan Gurau, Sabine Harribey, Kenta Suzuki

Journal of Physics A: Mathematical and Theoretical53 ( 44 ) 445008 - 445008 6 11 2020

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Publishing type：Research paper (scientific journal) Publisher：IOP Publishing

DOI： 10.1088/1751-8121/abb6ae

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Other Link： https://iopscience.iop.org/article/10.1088/1751-8121/abb6ae/pdf
Conformal symmetry and composite operators in the O(N )3 tensor field theory Peer-reviewed

Dario Benedetti, Razvan Gurau, Kenta Suzuki

Journal of High Energy Physics2020 ( 6 ) 6 2020

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1007/jhep06(2020)113

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Hints of unitarity at large N in the O(N )3 tensor field theory Peer-reviewed

Dario Benedetti, Razvan Gurau, Sabine Harribey, Kenta Suzuki

Journal of High Energy Physics2020 ( 2 ) 2 2020

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1007/jhep02(2020)072

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AdS maps and diagrams of bi-local holography Peer-reviewed

Robert de Mello Koch, Antal Jevicki, Kenta Suzuki, Junggi Yoon

Journal of High Energy Physics2019 ( 3 ) 3 2019

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1007/jhep03(2019)133

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Space-time in the SYK model Peer-reviewed

Sumit R. Das, Animik Ghosh, Antal Jevicki, Kenta Suzuki

Journal of High Energy Physics2018 ( 7 ) 7 2018

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1007/jhep07(2018)184

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Three dimensional view of arbitrary q SYK models Peer-reviewed

Sumit R. Das, Animik Ghosh, Antal Jevicki, Kenta Suzuki

Journal of High Energy Physics2018 ( 2 ) 2 2018

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1007/jhep02(2018)162

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Other Link： http://link.springer.com/article/10.1007/JHEP02(2018)162/fulltext.html
Duality in the Sachdev-Ye-Kitaev Model

Sumit R. Das, Animik Ghosh, Antal Jevicki, Kenta Suzuki

Quantum Theory and Symmetries with Lie Theory and Its Applications in Physics Volume 2 43 - 61 2018

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Publishing type：Part of collection (book) Publisher：Springer Singapore

DOI： 10.1007/978-981-13-2179-5_4

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Three dimensional view of the SYK/AdS duality Peer-reviewed

Sumit R. Das, Antal Jevicki, Kenta Suzuki

Journal of High Energy Physics2017 ( 9 ) 9 2017

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1007/jhep09(2017)017

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Bi-local holography in the SYK model: perturbations Peer-reviewed

Antal Jevicki, Kenta Suzuki

Journal of High Energy Physics2016 ( 11 ) 11 2016

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1007/jhep11(2016)046

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Bi-local holography in the SYK model Peer-reviewed

Antal Jevicki, Kenta Suzuki, Junggi Yoon

Journal of High Energy Physics2016 ( 7 ) 7 2016

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1007/jhep07(2016)007

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Thermofield duality for higher spin Rindler Gravity Peer-reviewed

Antal Jevicki, Kenta Suzuki

Journal of High Energy Physics2016 ( 2 ) 2 2016

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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1007/jhep02(2016)094

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Physical unitarity for a massive Yang-Mills theory without the Higgs field: A perturbative treatment Peer-reviewed

Kei-Ichi Kondo, Kenta Suzuki, Hitoshi Fukamachi, Shogo Nishino, Toru Shinohara

Physical Review D87 ( 2 ) 9 1 2013

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Publishing type：Research paper (scientific journal) Publisher：American Physical Society (APS)

DOI： 10.1103/physrevd.87.025017

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Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.87.025017/fulltext

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