Sho Ejiri - My portal - researchmap

Profile Information

Affiliation: Associate Professor, Department of Mathematics, Osaka Metropolitan University

J-GLOBAL ID: 202101005402162193
researchmap Member ID: R000018558

Research Interests

6

Research Areas

1

Natural sciences / Algebra / Algebraic geometry

Research History

6

Apr, 2023 - Present

Associate Professor, Department of Mathematics, Osaka Metropolitan University
Apr, 2022 - Mar, 2023

Post Doctor, Osaka Central Advanced Mathematical Institute, Osaka Metropolitan University
Aug, 2021 - Oct, 2021

Post Doctor, School of Basic Sciences, Institute of Mathematics, Swiss Federal Institute of Technology in Lausanne
Apr, 2018 - Jul, 2021

Post doctor (Japan Society for the Promotion of Science, Research Fellowships for Young Scientists (PD)), Graduate School of Science Department of Mathematics, Osaka University
Sep, 2017 - Mar, 2018

Post doctor (Japan Society for the Promotion of Science, Research Fellowships for Young Scientists (PD)), Graduate School of Mathematical Sciences, The University of Tokyo
Apr, 2015 - Sep, 2017

Doctoral student (Japan Society for the Promotion of Science, Research Fellowships for Young Scientists (DC1)), Graduate School of Mathematical Sciences, The University of Tokyo

Education

3

Apr, 2015 - Sep, 2017

Graduate School of Mathematical Sciences, The University of Tokyo
Apr, 2013 - Mar, 2015

Graduate School of Mathematical Sciences, The University of Tokyo
Apr, 2011 - Mar, 2013

Department of Mathematics, Faculty of Science, Kobe University

Awards

1

Mar, 2018

Prize of Dean. Graduate School of Mathematical Sciences, University of Tokyo, Graduate School of Mathematical Sciences, The University of Tokyo

Papers

12

Notes on Frobenius stable direct images

Sho Ejiri

Journal of Algebra, 633 464-473, Nov, 2023 Peer-reviewed
Notes on direct images of pluricanonical bundles

Sho Ejiri

to appear in European Journal of Mathematics, Sep, 2023 Peer-reviewed
Direct images of pluricanonical bundles and Frobenius stable canonical rings of fibers

Sho Ejiri

to appear in Algebraic Geometry, Mar, 2023 Peer-reviewed
On asymptotic base loci of relative anti-canonical divisors of algebraic fiber spaces

Sho Ejiri, Masataka Iwai, Shin-ichi Matsumura

Journal of Algebraic Geometry, Jan 31, 2023 Peer-reviewed
On the abundance theorem for numerically trivial canonical divisors in positive characteristic

Sho Ejiri

Journal für die reine und angewandte Mathematik (Crelles Journal), 2022(789) 253-264, Aug 1, 2022 Peer-reviewed
Subadditivity of Kodaira dimension does not hold in positive characteristic

Paolo Cascini, Sho Ejiri, János Kollár, Lei Zhang

Commentarii Mathematici Helvetici, 96(3) 465-481, Nov 22, 2021 Peer-reviewed
Positivity of anticanonical divisors and F-purityof fibers

Sho Ejiri

Algebra & Number Theory, 13(9) 2057-2080, Dec 7, 2019 Peer-reviewed
A Characterization of Ordinary Abelian Varieties by the Frobenius Push-Forward of the Structure Sheaf II

Sho Ejiri, Akiyoshi Sannai

International Mathematics Research Notices, 2019(19) 5975-5988, Oct 1, 2019 Peer-reviewed
When is the Albanese morphism an algebraic fiber space in positive characteristic?

Sho Ejiri

manuscripta mathematica, 160(1-2) 239-264, Sep, 2019 Peer-reviewed
Nef anti-canonical divisors and rationally connected fibrations

Sho Ejiri, Yoshinori Gongyo

Compositio Mathematica, 155(7) 1444-1456, Jul, 2019 Peer-reviewed
Iitaka’s $C_{n,m}$ conjecture for $3$-folds in positive characteristic

Sho Ejiri, Lei Zhang

Mathematical Research Letters, 25(3) 783-802, 2018 Peer-reviewed
Weak positivity theorem and Frobenius stable canonical rings of geometric generic fibers

Sho Ejiri

Journal of Algebraic Geometry, 26(4) 691-734, Jun 2, 2017 Peer-reviewed

Misc.

6

Splitting of algebraic fiber spaces with nef relative anti-canonical divisor and decomposition of F-split varieties

Sho Ejiri

Aug, 2023
Positivity of extensions of vector bundles

Sho Ejiri, Osamu Fujino, Masataka Iwai

Jul, 2023
The Demailly--Peternell--Schneider conjecture is true in positive characteristic

Sho Ejiri, Zsolt Patakfalvi

May, 2023
Varieties in positive characteristic with numerically flat log cotangent bundle

Sho Ejiri, Shou Yoshikawa

Mar, 2023
Numerical Kodaira dimension of algebraic fiber spaces in positive characteristic

Sho Ejiri

Dec, 2022
On weak positivity theorems and Iitaka’s conjecture in positive characteristic

Sho Ejiri

2016 55-63, Dec, 2016 Invited

Presentations

44

The Demailly--Peternell--Schneider conjecture is true in positive characteristic

Sho Ejiri

Jul 21, 2023 Invited
Numerical Kodaira dimension of algebraic fiber spaces in positive characteristic

Sho Ejiri

Jun 21, 2023 Invited
Numerical Kodaira dimension of algebraic fiber spaces in positive characteristic

Sho Ejiri

May 11, 2023 Invited
Subadditivity of Kodaira dimension does not hold in positive characteristic

Sho Ejiri

Oct 26, 2021 Invited
On the abundance theorem for numerically trivial canonical divisors in positive characteristic

Sho Ejiri

Princeton Algebraic Geometry Seminar, Mar 30, 2021 Invited
Subadditivity of Kodaira dimension does not hold in positive characteristic

Sho Ejiri

Nov, 2020 Invited
On positivity of relative anti-canonical divisors

Sho Ejiri

Apr, 2020 Invited
Nef anti-canonical divisors and rationally connected fibrations

Sho Ejiri

Algebraic Geometry Seminar, Johns Hopkins University, Mar, 2020 Invited
Iitaka's conjecture in positive characteristic and related topics

Sho Ejiri

Jan, 2020 Invited
On relative versions of Fujita’s freeness conjecture in positive characteristic

Sho Ejiri

Tokyo–Seoul Conference in Mathematics 2019, Nov, 2019 Invited
On direct images of pluricanonical bundles in positive characteristic

Sho Ejiri

Nov, 2019 Invited
On extensions of Iitaka’s conjecture to positive characteristic

Sho Ejiri

Groups, Arithmetic and Algebraic Geometry Seminar, Oct, 2019 Invited
Iitaka's conjecture and weak positivity theorem in positive characteristic

Sho Ejiri

Young mathematicians workshop on algebraic, geometric, and analytic aspects of K-theory and vector bundles, Aug, 2019 Invited
On direct images of pluricanonical bundles in positive characteristic

Sho Ejiri

Workshop on Algebraic Geometry, 復旦大学, Jul, 2019 Invited
On direct images of pluricanonical bundles in positive characteristic

Sho Ejiri

Jul, 2019 Invited
On direct images of pluricanonical bundles in positive characteristic

Sho Ejiri

Seminar of algebraic geometry, Beijing International Center for Mathematical Research,, Jun, 2019 Invited
On direct images of pluricanonical bundles in positive characteristic

Sho Ejiri

Algebra & Combinatorics Seminar, 南方科技大学, Jun, 2019 Invited
On direct images of pluricanonical bundles in positive characteristic

Sho Ejiri

Apr, 2019 Invited
On direct images of pluricanonical bundles in positive characteristic

Sho Ejiri

Algebraic Geometry in Positive Characteristic and Related Topics, Dec, 2018 Invited
On direct images of pluricanonical bundles in positive characteristic

Sho Ejiri

MAGIC seminar, Imperial College London, Nov, 2018

More

Research Projects

2

正標数の代数的ファイバー空間に関する研究

科学研究費助成事業特別研究員奨励費, 特別研究員奨励費, 日本学術振興会, Apr, 2018 - Mar, 2021

江尻祥
通常代数多様体を一般ファイバーに持つファイバー空間の研究

科学研究費助成事業特別研究員奨励費, 特別研究員奨励費, 日本学術振興会, Apr, 2015 - Mar, 2018

江尻祥