Updated on 2022/04/12

写真a

 
SHIGEMORI Masaki
 
Organization
Graduate School of Science Professor
School of Science Department of Physics Professor
Graduate School
Graduate School of Science
Title
Professor

Degree 1

  1. Ph.D. ( 2004.9   University of California, Los Angeles ) 

Research Interests 6

  1. AdS/CFT correspondence

  2. black hole

  3. black-hole microstate

  4. string theory

  5. theoretical particle physics

  6. supergravity

Research Areas 1

  1. Natural Science / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

Research History 7

  1. Nagoya University   Professor

    2021.10

  2. Kyoto University   Yukawa Institute for Theoretical Physics   Designated professor

    2019.4

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    Country:Japan

  3. Nagoya University   Department of Physics   Designated professor

    2018.10 - 2021.9

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    Country:Japan

  4. Kyoto University   Yukawa Institute for Theoretical Physics   Designated associate professor

    2016.10 - 2019.3

  5. Queen Mary University of London   School of Physics and Astronomy   Lecturer

    2016.10 - 2018.9

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    Country:United Kingdom

  6. Kyoto University   Designated associate professor

    2013.4 - 2016.9

  7. Nagoya University   Designated assistant professor

    2010.11 - 2013.3

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Education 1

  1. University of California, Los Angeles

    2000.9 - 2004.9

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    Country: United States

Professional Memberships 1

  1. 日本物理学会

 

Papers 32

  1. Interpolating between multi-center microstate geometries Reviewed

    Shigemori Masaki

    JOURNAL OF HIGH ENERGY PHYSICS   Vol. 2021 ( 9 )   2021.9

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    Authorship:Lead author   Language:English   Publisher:Journal of High Energy Physics  

    We study interpolation between two multi-center microstate geometries in 4d/5d that represent Lunin-Mathur geometries with circular profiles. The interpolating solution is a Lunin-Mathur geometry with a helical profile, and is represented by a 2-center solution with a codimension-2 source. The interpolating 2-center solution exhibits interesting features such as some of the charges being delocalized, and some of the charges getting transferred from the codimension-2 center to the other, codimension-3 center as the interpolation proceeds. We also discuss the spectral flow of this entire process and speculate on the relevance of such solutions to understanding general microstates of 3-charge black holes.

    DOI: 10.1007/JHEP09(2021)010

    Web of Science

    Scopus

  2. T(T)over-bar Deformation of stress-tensor correlators from random geometry Reviewed

    Hirano Shinji, Nakajima Tatsuki, Shigemori Masaki

    JOURNAL OF HIGH ENERGY PHYSICS   Vol. 2021 ( 4 )   2021.4

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    Authorship:Lead author   Language:English   Publisher:Journal of High Energy Physics  

    We study stress-tensor correlators in the TT¯ -deformed conformal field theories in two dimensions. Using the random geometry approach to the TT¯ deformation, we develop a geometrical method to compute stress-tensor correlators. More specifically, we derive the TT¯ deformation to the Polyakov-Liouville conformal anomaly action and calculate three and four-point correlators to the first-order in the TT¯ deformation from the deformed Polyakov-Liouville action. The results are checked against the standard conformal perturbation theory computation and we further check consistency with the TT¯ -deformed operator product expansions of the stress tensor. A salient feature of the TT¯ -deformed stress-tensor correlators is a logarithmic correction that is absent in two and three-point functions but starts appearing in a four-point function.

    DOI: 10.1007/JHEP04(2021)270

    Web of Science

    Scopus

  3. Counting D1-D5-P microstates in supergravity Reviewed

    Mayerson Daniel R., Shigemori Masaki

    SCIPOST PHYSICS   Vol. 10 ( 1 )   2021.1

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SciPost Physics  

    We quantize the D1-D5-P microstate geometries known as superstrata directly in supergravity. We use Rychkov's consistency condition [hep-th/0512053] which was derived for the D1-D5 system; for superstrata, this condition turns out to be strong enough to fix the symplectic form uniquely. For the (1, 0, n) superstrata, we further confirm this quantization by a bona-fide explicit computation of the symplectic form using the semiclassical covariant quantization method in supergravity. We use the resulting quantizations to count the known supergravity superstrata states, finding agreement with previous countings that the number of these states grows parametrically smaller than those of the corresponding black hole.

    DOI: 10.21468/SciPostPhys.10.1.018

    Web of Science

    Scopus

  4. Random boundary geometry and gravity dual of TT<mml:mo stretchy="true"><overbar></mml:mover> deformation Reviewed

    Hirano Shinji, Shigemori Masaki

    JOURNAL OF HIGH ENERGY PHYSICS   Vol. 2020 ( 11 )   2020.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of High Energy Physics  

    We study the random geometry approach to the TT¯ deformation of 2d conformal field theory developed by Cardy and discuss its realization in a gravity dual. In this representation, the gravity dual of the TT¯ deformation becomes a straightforward translation of the field theory language. Namely, the dual geometry is an ensemble of AdS3 spaces or BTZ black holes, without a finite cutoff, but instead with randomly fluctuating boundary diffeomorphisms. This reflects an increase in degrees of freedom in the renormalization group flow to the UV by the irrelevant TT¯ operator. We streamline the method of computation and calculate the energy spectrum and the thermal free energy in a manner that can be directly translated into the gravity dual language. We further generalize this approach to correlation functions and reproduce the all-order result with universal logarithmic corrections computed by Cardy in a different method. In contrast to earlier proposals, this version of the gravity dual of the TT¯ deformation works not only for the energy spectrum and the thermal free energy but also for correlation functions.

    DOI: 10.1007/JHEP11(2020)108

    Web of Science

    Scopus

  5. Superstrata Reviewed

    Shigemori Masaki

    GENERAL RELATIVITY AND GRAVITATION   Vol. 52 ( 5 )   2020.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:General Relativity and Gravitation  

    We give a survey of the present status of the microstate geometries called superstrata. Superstrata are smooth, horizonless solutions of six-dimensional supergravity that represent some of the microstates of the D1–D5–P black hole in string theory. They are the most general microstate geometries of that sort whose CFT dual states are identified. After reviewing relevant features of the dual CFT, we discuss the construction of superstratum solutions in supergravity, based on the linear structure of the BPS equations. We also review some of recent work on generalizations of superstrata and physical properties of superstrata. Although the number of superstrata constructed so far is not enough to account for the black-hole entropy, they give us valuable insights into the microscopic physics of black holes.

    DOI: 10.1007/s10714-020-02698-8

    Web of Science

    Scopus

  6. Counting Superstrata Reviewed

    Masaki Shigemori

    JHEP   Vol. 10 ( 10 ) page: 017 - 017   2019.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    We count the number of regular supersymmetric solutions in supergravity,
    called superstrata, that represent non-linear completion of linear fluctuations
    around empty AdS_3 x S^3. These solutions carry the same charges as the D1-D5-P
    black hole and represent its microstates. We estimate the entropy using
    thermodynamic approximation and find that it is parametrically smaller than the
    area-entropy of the D1-D5-P black hole. Therefore, these superstrata based on
    AdS_3 x S^3 are not typical microstates of the black hole. What are missing in
    the superstrata based on AdS_3 x S^3 are higher and fractional modes in the
    dual CFT language. We speculate on what kind of other configurations to look at
    as possible realization of those modes in gravity picture, such as superstrata
    based on other geometries, as well as other brane configurations.

    DOI: 10.1007/JHEP10(2019)017

    Web of Science

    Scopus

    arXiv

  7. Supercharging Superstrata Reviewed

    Nejc Ceplak, Russo, Rodolfo, Shigemori, Masaki

    JHEP   Vol. 03 ( 3 ) page: 095 - 095   2019.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    We construct a new class of smooth horizonless microstate geometries of the
    supersymmetric D1-D5-P black hole in type IIB supergravity. We first work in
    the AdS$_3 \times S^3$ decoupling limit and use the fermionic symmetries of the
    theory to generate new momentum carrying perturbations in the bulk that have an
    explicit CFT dual description. We then use the supergravity equations to
    calculate the backreaction of these perturbations and find the full non-linear
    solutions both in the asymptotically AdS and asymptotically flat case. These
    new geometries have a simpler structure than the previously known superstrata
    solutions.

    DOI: 10.1007/JHEP03(2019)095

    Web of Science

    Scopus

    arXiv

  8. Asymptotically-flat supergravity solutions deep inside the black-hole regime Reviewed

    Bena, Iosif, Giusto, Stefano, Martinec, Emil J., Russo, Rodolfo, Shigemori, Masaki, David Turton, Warner, Nicholas P.

    JHEP   Vol. 02   page: 014 - 014   2018.2

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    Publishing type:Research paper (scientific journal)  

    We construct an infinite family of smooth asymptotically-flat supergravity
    solutions that have the same charges and angular momenta as general
    supersymmetric D1-D5-P black holes, but have no horizon. These solutions
    resemble the corresponding black hole to arbitrary accuracy outside of the
    horizon: they have asymptotically flat regions, AdS_3 x S^3 throats and
    very-near-horizon AdS_2 throats, which however end in a smooth cap rather than
    an event horizon. The angular momenta of the solutions are general, and in
    particular can take arbitrarily small values. Upon taking the AdS_3 x S^3
    decoupling limit, we identify the holographically-dual CFT states.

    DOI: 10.1007/JHEP02(2018)014

    arXiv

  9. Non-Abelian Supertubes Reviewed

    Jose J. Fernandez-Melgarejo, Minkyu Park, Shigemori, Masaki

    JHEP   Vol. 12   page: 103 - 103   2017.12

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    Publishing type:Research paper (scientific journal)  

    A supertube is a supersymmetric configuration in string theory which occurs
    when a pair of branes spontaneously polarizes and generates a new dipole charge
    extended along a closed curve. The dipole charge of a codimension-2 supertube
    is characterized by the U-duality monodromy as one goes around the supertube.
    For multiple codimension-2 supertubes, their monodromies do not commute in
    general. In this paper, we construct a supersymmetric solution of
    five-dimensional supergravity that describes two supertubes with such
    non-Abelian monodromies, in a certain perturbative expansion. In supergravity,
    the monodromies are realized as the multi-valuedness of the scalar fields,
    while in higher dimensions they correspond to non-geometric duality twists of
    the internal space. The supertubes in our solution carry NS5 and 5$_2^2$ dipole
    charges and exhibit the same monodromy structure as the SU(2) Seiberg-Witten
    geometry. The perturbative solution has $\mathrm{AdS}_2\times S^2$ asymptotics
    and vanishing four-dimensional angular momentum. We argue that this solution
    represents a microstate of four-dimensional black holes with a finite horizon
    and that it provides a clue for the gravity realization of a pure-Higgs branch
    state in the dual quiver quantum mechanics.

    DOI: 10.1007/JHEP12(2017)103

    arXiv

  10. Smooth horizonless geometries deep inside the black-hole regime Reviewed

    I. Bena, S. Giusto, E. J. Martinec, R. Russo, M. Shigemori, D. Turton and N. P. Warner

      Vol. 117   page: 201601   2016

  11. Supersymmetric Solutions in Six Dimensions: A Linear Structure Reviewed

    Iosif Bena, Stefano Giusto, Masaki Shigemori, Nicholas P. Warner

    JHEP   Vol. 03   page: 084   2012

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  12. Moulting Black Holes Reviewed

    Iosif Bena, Borun D. Chowdhury, Jan de Boer, Sheer El-Showk, Masaki Shigemori

    JHEP   Vol. 03   page: 094   2012

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  13. Thermalization of Strongly Coupled Field Theories

    Vijay Balasubramanian, Alice Bernamonti, Jan de Boer, Niel Copland, Ben Craps, Esko Keski-Vakkuri, Berndt Muller, Andreas Schafer, Masaki Shigemori, Wieland Staessens

    Physical Review Letters   Vol. 106   page: 191601   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  14. Double, Double Supertube Bubble

    Iosif Bena, Jan de Boer, Masaki Shigemori, Nicholas P. Warner

    JHEP   Vol. 1110   page: 116   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  15. Holographic Thermalization

    Vijay Balasubramanian, Alice Bernamonti, Jan de Boer, Niel Copland, Ben Craps, Esko Keski-Vakkuri, Berndt Muller, Andreas Schafer, Masaki Shigemori, Wieland Staessens

    Physical Review D   Vol. 84   page: 026010   2011

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    Language:English   Publishing type:Research paper (scientific journal)  

  16. Exotic branes and non-geometric backgrounds

    Jan de Boer, Masaki Shigemori

    Physical Review Letters   Vol. 104   page: 251603   2010

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    Language:English   Publishing type:Research paper (scientific journal)  

  17. Brownian motion in AdS/CFT

    Jan de Boer, Veronika E. Hubeny, Mukund Rangamani, Masaki Shigemori

    JHEP   Vol. 0907   page: 094   2009

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    Language:English   Publishing type:Research paper (scientific journal)  

  18. Nonsupersymmetric Brane/Antibrane Configurations in Type IIA and M Theory

    Joseph Marsano, Kyriakos Papadodimas, Masaki Shigemori

    Nuclear Physics B   Vol. 789   page: 294-361   2008

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    Language:English   Publishing type:Research paper (scientific journal)  

  19. Nonsupersymmetric Flux Vacua and Perturbed N=2 Systems

    Lotte Hollands, Joseph Marsano, Kyriakos Papadodimas, Masaki Shigemori

    JHEP   Vol. 0810   page: 102   2008

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    Language:English   Publishing type:Research paper (scientific journal)  

  20. Off-shell M5 Brane, Perturbed Seiberg-Witten Theory, and Metastable Vacua

    Joseph Marsano, Kyriakos Papadodimas, Masaki Shigemori

    Nuclear Physics B   Vol. 804   page: 19-69   2008

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    Language:English   Publishing type:Research paper (scientific journal)  

  21. Are There Four-Dimensional Small Black Rings?

    Norihiro Iizuka, Masaki Shigemori

    Physical Review D   Vol. 77   page: 044044   2008

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    Language:English   Publishing type:Research paper (scientific journal)  

  22. Spinning strings as small black rings

    Atish Dabholkar, Norihiro Iizuka, Ashik Iqubal, Ashoke Sen, Masaki Shigemori

    JHEP   Vol. 0704   page: 017   2007

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    Language:English   Publishing type:Research paper (scientific journal)  

  23. Towards Statistical Mechanical Understanding of Black Holes

      Vol. 61   page: 506-510   2006

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    Language:Japanese  

  24. Precision microstate counting of small black rings

    Atish Dabholkar, Norihiro Iizuka, Ashik Iqubal, Masaki Shigemori

    Physical Review Letters   Vol. 96   page: 071601   2006

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    Language:English   Publishing type:Research paper (scientific journal)  

  25. A Note on D1-D5-J system and 5-D small black ring

      Vol. 0508   page: 100   2005

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    Language:English   Publishing type:Research paper (scientific journal)  

  26. Massless black holes and black rings as effective geometries of the D1-D5 system

    Vijay Balasubramanian, Per Kraus, Masaki Shigemori

      Vol. 22   page: 4803-4838   2005

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    Language:English   Publishing type:Research paper (scientific journal)  

  27. On low rank classical groups in string theory, gauge theory and matrix models

    Kenneth A. Intriligator, Per Kraus, Anton V. Ryzhov, Masaki Shigemori, Cumrun Vafa

    Nuclear Physics B   Vol. 682   page: 45-82   2004

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    Language:English   Publishing type:Research paper (scientific journal)  

  28. Supersymmetric gauge theories with flavors and matrix models

      Vol. 698   page: 3-52   2004

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    Language:English   Publishing type:Research paper (scientific journal)  

  29. On the matter of the Dijkgraaf-Vafa conjecture

    Per Kraus, Masaki Shigemori

    JHEP   Vol. 0304   page: 052   2003

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    Language:English   Publishing type:Research paper (scientific journal)  

  30. Loop equations, matrix models, and N=1 supersymmetric gauge theories

    Per Kraus, Anton V. Ryzhov, Masaki Shigemori

    JHEP   Vol. 0305   page: 059   2003

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    Language:English   Publishing type:Research paper (scientific journal)  

  31. Non-commutative instantons and the Seiberg-Witten map Reviewed

    Per Kraus, Masaki Shigemori

    JHEP   Vol. 0206   page: 034   2002

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1126-6708/2002/06/034

  32. Strings in noncompact space-times: Boundary terms and conserved charges. Reviewed

    Per Kraus, Anton Ryzhov, Masaki Shigemori

    Physical Review D   Vol. 66   page: 22   2002

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    Language:English   Publishing type:Research paper (scientific journal)  

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Presentations 14

  1. TTbar deformation of stress-tensor correlators from random geometry Invited International coauthorship

    2021.6.1 

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    Event date: 2021.6

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:Osaka University (Zoom)  

  2. Moulting black holes

    Masaki Shigemori

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    Event date: 2011.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  3. Exotic branes and non-geometric backgrounds

    Masaki Shigemori

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    Event date: 2011.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  4. Moulting black holes

    Masaki Shigemori

    IPMU workshop on black holes 

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    Event date: 2011.2

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  5. Exotic branes and non-geometric backgrounds

    Masaki Shigemori

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    Event date: 2011.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  6. Exotic branes and non-geometric backgrounds International conference

    Masaki Shigemori

    International Conference on Strings, M-Theory and Quantum Gravity 

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    Event date: 2010.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  7. Brownian motion in AdS/CFT

    Masaki Shigemori

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    Event date: 2009.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  8. Brownian motion in AdS/CFT

    Masaki Shigemori

    Branes, Strings, and Black Holes 

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    Event date: 2009.10

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  9. Brownian motion in AdS/CFT International conference

    Masaki Shigemori

    String Theory 

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    Event date: 2009.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  10. Brownian motion in AdS/CFT International conference

    Masaki Shigemori

    Tenth Workshop on Non-Perturbative Quantum Chromodynamics 

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    Event date: 2009.6

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  11. Small black rings International conference

    Masaki Shigemori

    Black Holes: A Landscape of Theoretical Physics Problems 

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    Event date: 2008.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  12. Small black rings International conference

    Masaki Shigemori

    Southern California Strings Seminar 

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    Event date: 2006.12

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  13. How a Black Hole Emerges from a Pure State International conference

    Masaki Shigemori

    IPM String School and Workshop 

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    Event date: 2006.4

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  14. Counting Small Black Rings International conference

    Masaki Shigemori

    Mathematical Structures in String Theory 

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    Event date: 2005.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

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KAKENHI (Grants-in-Aid for Scientific Research) 5

  1. 量子情報を用いた量子ブラックホールの内部の物理学の解明

    Grant number:21H05184  2021.9 - 2026.3

    科学研究費助成事業 学術変革領域研究(A)   学術変革領域研究(A)

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    Authorship:Coinvestigator(s)  Grant type:Competitive

  2. TTbar deformation and holography

    Grant number:21K03552  2021.4 - 2024.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Authorship:Principal investigator 

    Grant amount:\2340000 ( Direct Cost: \1800000 、 Indirect Cost:\540000 )

  3. Microstructure of Black Holes and String Theory

    Grant number:16H03979  2016.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    Shigemori Masaki

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    Authorship:Principal investigator 

    Grant amount:\17420000 ( Direct Cost: \13400000 、 Indirect Cost:\4020000 )

    Black holes are almost featureless macroscopically but, microscopically, they must be made of microstates with non-trivial structure. Some of such black-hole microstates are known to be described by “microstate geometries” -- smooth and horizonless solutions of classical gravity theory. In this research, we constructed various microstate geometries that describe microstates of black holes that appear in string theory. These microstate geometries are called “superstrata” and represent the most general class of microstate geometries ever constructed. The microstate geometries constructed in the current project provide indispensable tools that can be used to explore microscopic physics of black holes in a very concrete manner.

  4. ブラックホールの微視的構造と弦理論 研究課題

    2016.4 - 2020.3

    科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

  5. 弦理論におけるエキゾチックブレーンの物理

    Grant number:24740159  2012.4 - 2016.3

    科学研究費補助金  若手研究(B)

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    Authorship:Principal investigator 

 

Social Contribution 1

  1. NHK名古屋 宇宙講座「弦理論とは何か」

    Role(s):Lecturer

    NHK名古屋  宇宙講座  2021.5