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# Research (Hiroki SAKO)

email : my last name at ie.niigata-u.ac.jp

I am interested in operator algebras([1 - 6, 8, 10]),
discrete groups([1, 2, 9, 10]),
metric spaces([4-6, 8 - 10]),
probability measures and orthogonal polynomials([7, 11]).

List of my papers

[11] H. Saigo and H. Sako, The Arcsine law and an asymptotic behavior of orthogonal polynomials,
preprint arXiv:1407.0792
abstract

[10] M. Mimura, N. Ozawa, H. Sako, and Y. Suzuki, Group approximation in Cayley topology and coarse geometry, Part III: Geometric property (T),
accepted (Algebreaic and Geometric Topology), arxiv:1402.5105
abstract

[9] M. Mimura and H. Sako, Group approximation in Cayley topology and coarse geometry, Part I: Coarse embeddings of amenable groups,
preprint arxiv:1310.4736
abstract

[8] H. Sako, Property A for coarse spaces,
preprint arXiv:1303.7027
abstract

[7] H. Saigo and H. Sako, Indeterminacy of the moment problem for Symmetric probability measures,
preprint arXiv:1302.0382
abstract

[6] H. Sako, Translation C^*-algebras and property A for uniformly locally finite spaces,
preprint arXiv:1212.5900.
abstract

[5] H. Sako, A generalization of expander graphs and local reflexivity of uniform Roe algebras,
J. Funct. Anal., 265 (2013), no. 7, 1367--1391, arXiv:1208.5642.
abstract

[4] H. Sako, Property A and the operator norm localization property for discrete metric spaces,
J. Reine Angew. Math., 690 (2014), 207--216, arXiv:1203.5496.
abstract

[3] Hiroki Sako, Concrete Classification and Centralizers of Certain (Z^2 \rtimes SL(2, Z))-actions,
J. Math. Soc. Japan, 62 (2010), no.1, 135--166, arXiv:0704.1533.
abstract

[2] Hiroki Sako, Measure Equivalence Rigidity and Bi-exactness of Groups,
J. Funct. Anal., 257 (2009), 3167--3202, arXiv:0901.3376.
abstract

[1] Hiroki Sako, The class S as an ME invariant,
Internat. Math. Res. Notices, 2009, 2749--2759, arXiv:0901.3374.
abstract

A short CV

Born: October 5, 1982

Education:
April 2001 - March 2005 (Undergraduate), University of Tokyo
April 2005 - March 2007 (Master course), Graduate school of Mathematical Sciences, University of Tokyo
April 2007 - March 2009, Department of Mathematics, University of California Los Angeles (Adviser: Sorin Popa)
April 2007 - March 2010 (Doctoral course), Graduate school of Mathematical Sciences, University of Tokyo (Adviser: Yasuyuki Kawahigashi)

Degree:
March 2005, B.Sc., University of Tokyo
March 2007, Master, Graduate School of Mathematical Sciences, University of Tokyo
March 2010, Doctor, Graduate School of Mathematical Sciences, University of Tokyo

Fellowship:
April 2007--March 2010, Research Fellowship of the Japan Society for the Promotion of Science for Young Scientists (DC1)
April 2010--March 2013, Research Fellow of the Japan Society for the Promotion of Science (PD)

Job:
April 2013-- August 2014, Lecturer, Tokai University, School of Science
September 2014 -- , Associate Professor, Niigata University

Citizenship: Japan

Summary of my results in metric geometry

Slide for the conference Metric geometry and analysis'' in Kyoto University
December 10, 2013
The slide does not include joint works with Masato Mimura.

Public Data
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