Updated on 2024/06/06

写真a

 
YAMAMORI Atsushi
 
Organization
Faculty of Information Engineering Department of Computer Science and Engineering Associate Professor
Graduate School of Engineering Master's program Computer Science and Engineering Associate Professor
Title
Associate Professor
External link

Research Interests

  • holomorphic automorohism group

  • Bergman kernel

  • 正則同値問題

Research Areas

  • Natural Science / Basic analysis  / Several Complex Variables

Professional Memberships

  • 日本数学会

Papers

  • Two variations of Boas–Fu–Straube’s deflation identity Reviewed

    Atsushi Yamamori

    Archiv der Mathematik   113 ( 5 )   505 - 514   2019.11

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    Publishing type:Research paper (international conference proceedings)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s00013-019-01369-8

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    Other Link: http://link.springer.com/article/10.1007/s00013-019-01369-8/fulltext.html

  • On Origin-Preserving Automorphisms of Quasi-Circular Domains Reviewed

    Yamamori Atsushi, Zhang Liyou

    JOURNAL OF GEOMETRIC ANALYSIS   28 ( 2 )   1840 - 1852   2018.4

  • The Holomorphic Automorphism Groups of Twisted Fock-Bargmann-Hartogs Domains Reviewed

    Hyeseon Kim, Atsushi Yamamori

    Czechoslovak Mathematical Journal   68 ( 143 )   1 - 21   2018.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer New York LLC  

    We consider a certain class of unbounded nonhyperbolic Reinhardt domains which is called the twisted Fock-Bargmann-Hartogs domains. By showing Cartan’s linearity theorem for our unbounded nonhyperbolic domains, we give a complete description of the automorphism groups of twisted Fock-Bargmann-Hartogs domains.

    DOI: 10.21136/CMJ.2018.0551-16

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  • NON-HYPERBOLIC UNBOUNDED REINHARDT DOMAINS: NON-COMPACT AUTOMORPHISM GROUP, CARTAN'S LINEARITY THEOREM AND EXPLICIT BERGMAN KERNEL Reviewed

    Atsushi Yamamori

    TOHOKU MATHEMATICAL JOURNAL   69 ( 2 )   239 - 260   2017.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TOHOKU UNIVERSITY  

    In the study of the holomorphic automorphism groups, many researches have been carried out inside the category of bounded or hyperbolic domains. On the contrary to these cases, for unbounded non-hyperbolic cases, only a few results are known about the structure of the holomorphic automorphism groups. Main result of the present paper gives a class of unbounded non-hyperbolic Reinhardt domains with non-compact automorphism groups, Car tan's linearity theorem and explicit Bergman kernels. Moreover, a reformulation of Caftan's linearity theorem for finite volume Reinhardt domains is also given.

    DOI: 10.2748/tmj/1498269625

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  • Bergman Kernel Function for Hartogs Domains Over Bounded Homogeneous Domains Reviewed

    Hideyuki Ishi, Jong-Do Park, Atsushi Yamamori

    JOURNAL OF GEOMETRIC ANALYSIS   27 ( 2 )   1703 - 1736   2017.4

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

    We obtain an explicit formula of the Bergman kernel for Hartogs domains over bounded homogeneous domains. In order to find a simple formula, we consider a Siegel domain biholomorphic to the bounded homogeneous domain and use its Bergman kernel obtained by Gindikin. The Bergman kernel of the Hartogs domain is expressed by two different forms and the main part of the Bergman kernel is a polynomial whose coefficients contain the Stirling number of the second kind. As an application of our formula, we investigate the Lu Qi-Keng problem for our Hartogs domains and give some important examples of Hartogs domains whose Bergman kernels are zero-free.

    DOI: 10.1007/s12220-016-9737-4

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  • Invariant metrics on unbounded strongly pseudoconvex domains with non-compact automorphism group Reviewed

    Hyeseon Kim, Atsushi Yamamori, Liyou Zhang

    ANNALS OF GLOBAL ANALYSIS AND GEOMETRY   50 ( 3 )   261 - 295   2016.10

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

    We study invariant metrics on unbounded strongly pseudoconvex domains with non-compact automorphism group. The main result is that the corresponding Bergman and Khler-Einstein metrics are metrically equivalent. We also determine the comparisons among invariant metrics, including the Carath,odory and Kobayashi pseudo-metrics additionally.

    DOI: 10.1007/s10455-016-9511-7

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  • Yet Another Proof of Poincare's Theorem Reviewed

    Atsushi Yamamori

    AMERICAN MATHEMATICAL MONTHLY   122 ( 10 )   1003 - 1004   2015.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MATHEMATICAL ASSOC AMER  

    This note gives a concise proof of a classical Poincare's theorem which asserts that the unit ball B-2 and the polydisk D x D are not holomorphically equivalent.

    DOI: 10.4169/amer.math.monthly.122.10.1003

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  • An application of a Diederich-Ohsawa theorem in characterizing some Hartogs domains Reviewed

    Hyeseon Kim, Atsushi Yamamori

    BULLETIN DES SCIENCES MATHEMATIQUES   139 ( 7 )   737 - 749   2015.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Applying a theorem due to Diederich and Ohsawa on weighted Bergman kernels, we characterize some Hartogs domains by their holomorphic automorphisms. (C) 2014 Elsevier Masson SAS. All rights reserved.

    DOI: 10.1016/j.bulsci.2014.11.007

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  • On the linearity of origin-preserving automorphisms of quasi-circular domains in C-n Reviewed

    Atsushi Yamamori

    JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS   426 ( 1 )   612 - 623   2015.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE  

    A theorem due to Cartan asserts that every origin-preserving automorphism of bounded circular domains with respect to the origin is linear. In the present paper, by employing the theory of Bergman's representative domain, we prove that under certain circumstances Cartan's assertion remains true for quasi-circular domains in C-n. Our main result is applied to obtain some simple criterions for the case n = 3 and to prove that Braun-Kaup-Upmeier's theorem remains true for our class of quasi-circular domains. (C) 2015 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.jmaa.2015.01.061

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  • A GENERALIZATION OF THE FORELLI-RUDIN CONSTRUCTION AND DEFLATION IDENTITIES Reviewed

    Atsushi Yamamori

    PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY   143 ( 4 )   1569 - 1581   2015.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER MATHEMATICAL SOC  

    We establish a series representation formula of the Bergman kernel of a certain class of domains, which generalizes the Forelli-Rudin construction of the Hartogs domain. Our formula is applied to derive deflation type identities of the Bergman kernels for our domains.

    DOI: 10.1090/S0002-9939-2014-12317-3

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  • On Representative Domains and Cartan's Theorem Reviewed

    Atsushi Yamamori

    COMPLEX ANALYSIS AND GEOMETRY, KSCV 10   144   343 - 351   2015

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:SPRINGER  

    This is a short survey article on Cartan's theorem about automorphisms fixing the origin for certain class of quasi-circular domains and non-hyperbolic circular domains. Some open problems are also given.

    DOI: 10.1007/978-4-431-55744-9_26

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  • Automorphisms of normal quasi-circular domains Reviewed

    Atsushi Yamamori

    BULLETIN DES SCIENCES MATHEMATIQUES   138 ( 3 )   406 - 415   2014.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    It was shown by Kaup that every origin-preserving automorphism of quasi-circular domains is a polynomial mapping. In this paper, we study how the weight of quasi-circular domains and the degree of such automorphisms are related. By using the Bergman mapping, we prove that every origin-preserving automorphism of normal quasi-circular domains in C-2 is linear. (C) 2013 Elsevier Masson SAS. All rights reserved.

    DOI: 10.1016/j.bulsci.2013.10.002

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  • The automorphism group of a certain unbounded non-hyperbolic domain Reviewed

    Hyeseon Kim, Van Thu Ninh, Atsushi Yamamori

    JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS   409 ( 2 )   637 - 642   2014.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE  

    In this paper we determine the automorphism group of the Fock-Bargmann-Hartogs domain D-n,D-m in C-n x C-m which is defined by the inequality parallel to delta parallel to(2) < e(-mu parallel to z parallel to 2). (c) 2013 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.jmaa.2013.07.007

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  • The Bergman kernel of the FockBargmannHartogs domain and the polylogarithm function Reviewed

    Atsushi Yamamori

    COMPLEX VARIABLES AND ELLIPTIC EQUATIONS   58 ( 6 )   783 - 793   2013.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS LTD  

    We consider the FockBargmannHartogs domain D-n,D-m which is defined by the inequality where (z,)C(n)xC(m) and >0. We give an explicit formula for the Bergman kernel of the domain in terms of the polylogarithm functions. Moreover, using the interlacing property, we describe how the existence of zeros of the Bergman kernel depends on the integers m and n.

    DOI: 10.1080/17476933.2011.620098

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  • A note on the Bergman kernel of a certain Hartogs domain Reviewed

    Atsushi Yamamori

    COMPTES RENDUS MATHEMATIQUE   350 ( 17-18 )   827 - 829   2012.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER  

    We give an explicit formula of the Bergman kernel of a certain Hartogs domain. (C) 2012 Published by Elsevier Masson SAS on behalf of Academie des sciences.

    DOI: 10.1016/j.crma.2012.10.009

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  • A remark on the Bergman kernels of the Cartan-Hartogs domains Reviewed

    Atsushi Yamamori

    COMPTES RENDUS MATHEMATIQUE   350 ( 3-4 )   157 - 160   2012.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER  

    We give a new formula for the Bergman kernels of the Cartan-Hartogs domains. As an application of our formula, we study the Lu Qi-Keng problem of the Cartan-Hartogs domains. (C) 2012 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.

    DOI: 10.1016/j.crma.2012.01.005

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  • Generalized Laplacians on classical domains Reviewed

    Atsushi Yamamori

    RIMS Kokyuroku Bessatsu   B20   163 - 171   2010.10

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

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  • Eigenvalues of generalized Laplacians for generalized Poisson-Cauchy transforms on classical domains Reviewed

    Eisuke Imamura, Kiyosato Okamoto, Michiroh Tsukamoto, Atsushi Yamamori

    HIROSHIMA MATHEMATICAL JOURNAL   39 ( 2 )   237 - 275   2009.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:HIROSHIMA UNIV, GRAD SCH SCI  

    We develop a group-theoretic method to generalize the Laplace-Beltrami operators on the classical domains. In [11], inspired by Helgason's paper [3], we defined the "Poisson transforms'' for homogeneous vector bundles over symmetric spaces. In [13], we defined the generalized Poisson-Cauchy transforms for homogeneous holomorphic line bundles over hermitian symmetric spaces and computed explicitly the kernel functions for each type of the classical domains. In [7], making use of the Casimir operator, we defined the "generalized Laplacians'' on homogeneous holomorphic line bundles over hermitian symmetric spaces and showed that the generalized Poisson-Cauchy transforms give rise to eigenfunctions of the "generalized Laplacians''. In this paper, using the canonical coordinates for each type of the classical domains, we carry out the direct computation to obtain the explicit formulas of ( line bundle valued) invariant differential operators which we call the generalized Laplacians and compute their eigenvalues evaluated at the generalized Poisson-Cauchy kernel functions.

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  • Generalized Laplacians for generalized Poisson-Cauchy transforms on classical domains Reviewed

    Eisuke Imamura, Kiyosato Okamoto, Michiroh Tsukamoto, Atsushi Yamamori

    PROCEEDINGS OF THE JAPAN ACADEMY SERIES A-MATHEMATICAL SCIENCES   82 ( 9 )   167 - 172   2006.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN ACAD  

    We develop a group-theoretic method of generalizing the Laplace-Beltrami operators on the classical domains. In [18], we defined the generalized Poisson-Cauchy transforms on the classical domains. We show that the generalized Poisson-Cauchy transforms give us eigenfunctions of the generalized Laplacians defined in this paper.

    DOI: 10.3792/pjaa.82.167

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Teaching Experience (On-campus)

  • 2023   Analysis I

  • 2023   Analysis II

  • 2023   Seminar on Fundamentals of Computer

  • 2023   Linear Algebra I

  • 2023   Linear Algebra II

  • 2023   Special Lectures in Computer Science and

  • 2023   Graduation Study

  • 2023   Mathematics for information Science II

  • 2022   Analysis I

  • 2022   Analysis II

  • 2022   Seminar on Fundamentals of Computer

  • 2022   Linear Algebra I

  • 2022   Linear Algebra II

  • 2022   Special Lectures in Computer Science and

  • 2022   Graduation Study

  • 2022   Mathematics for information Science II

  • 2021   Analysis I

  • 2021   Analysis II

  • 2021   Seminar on Fundamentals of Computer

  • 2021   Linear Algebra I

  • 2021   Linear Algebra II

  • 2021   Analysis III

  • 2021   Special Lectures in Computer Science and

  • 2021   Graduation Study

  • 2021   Mathematics for information Science II

  • 2020   Linear Algebra II

  • 2020   Analysis I

  • 2020   Analysis II

  • 2020   Seminar on Fundamentals of Computer

  • 2020   Linear Algebra I

  • 2020   Special Lectures in Computer Science and

  • 2020   Mathematics for information Science II

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