Curriculum Vitae

Papers (Refereed Papers)

• A. Hoshi, Multiplicative quadratic forms on algebraic varieties,
  Proc. Japan Acad. Ser. A 79 (2003) 71-75.
• A. Hoshi, Noether's problem for some meta-abelian groups of small degree,
  Proc. Japan Acad. Ser. A 81 (2005) 1-6.
• K. Hashimoto, A. Hoshi, Families of cyclic polynomials obtained from geometric generalization of Gaussian period relations,
  Math. Comp. 74 (2005) 1519-1530.
• K. Hashimoto, A. Hoshi, Geometric generalization of Gaussian period relations with application to Noether's problem for meta-cyclic groups,
  Tokyo J. Math. 28 (2005) 13-32.
• A. Hoshi, Explicit lifts of quintic Jacobi sums and period polynomials for F_q,
  Proc. Japan Acad. Ser. A 82 (2006) 87-92.
• A. Hoshi, K. Miyake, Tschirnhausen transformation of a cubic generic polynomial and a 2-dimensional involutive Cremona transformation,
  Proc. Japan Acad. Ser. A 83 (2007) 21-26.
• K. Hashimoto, A. Hoshi, Y. Rikuna, Noether's problem and Q-generic polynomials for the normalizer of the 8-cycle in S₈ and its subgroups,
  Math. Comp. 77 (2008) 1153-1183.
• A. Hoshi, Y. Rikuna, Rationality problem of three-dimensional purely monomial group actions: the last case,
  Math. Comp. 77 (2008) 1823-1829.
• A. Hoshi, M. Kang, A rationality problem of some Cremona transformation,
  Proc. Japan Acad. Ser. A 84 (2008) 133-137.
• A. Hoshi, K. Miyake, A geometric framework for the subfield problem of generic polynomials via Tschirnhausen transformation,
  Number theory and applications, 65-104, Hindustan Book Agency, New Delhi, 2009.
• A. Hoshi, K. Miyake, On the field intersection problem of quartic generic polynomials via formal Tschirnhausen transformation,
  Comment. Math. Univ. St. Pauli 58 (2009) 51-86.
• A. Hoshi, K. Miyake, A note on the field isomorphism problem of X^3+sX+s and related cubic Thue equations,
  Interdiscip. Inform. Sci. 16 (2010) 45-54, Special Section: Japan-Korea Joint Seminar on Number Theory and Related Topics 2008.
• A. Hoshi, K. Miyake, On the field intersection problem of solvable quintic generic polynomials,
  Int. J. Number Theory 6 (2010) 1047-1081.
• A. Hoshi, M. Kang, Twisted symmetric group actions,
  Pacific J. Math. 248 (2010) 285-304.
• A. Hoshi, H. Kitayama, A. Yamasaki, Rationality problem of three-dimensional monomial group actions,
  J. Algebra 341 (2011) 45-108.
• A. Hoshi, On correspondence between solutions of a family of cubic Thue equations and isomorphism classes of the simplest cubic fields,
  J. Number Theory 131 (2011) 2135-2150.
• A. Hoshi, On the simplest sextic fields and related Thue equations,
  Funct. Approx. Comment. Math. 47 (2012) 35-49.
• A. Hoshi, M. Kang, B. E. Kunyavskii, Noether's problem and unramified Brauer groups,
  Asian J. Math. 17 (2013) 689-714.
• A. Hoshi, M. Kang, H. Kitayama, Quasi-monomial actions and some 4-dimensional rationality problems,
  J. Algebra 403 (2014) 363-400.
• A. Hoshi, On the simplest quartic fields and related Thue equations,
  Computer Mathematics, Springer, 67-85, 2014.
• A. Hoshi, On Noether's problem for cyclic groups of prime order,
  Proc. Japan Acad. Ser. A 91 (2015) 39-44.
• H. Chu, A. Hoshi, S.-J. Hu, M. Kang, Noether's problem for groups of order 243,
  J. Algebra 442 (2015) 233-259.
• A. Hoshi, Birational classification of fields of invariants for groups of order 128,
  J. Algebra 445 (2016) 394-432.
• A. Hoshi, M. Kang, A. Yamasaki, Degree three unramified cohomology groups,
  J. Algebra 458 (2016) 120-133.
• A. Hoshi, Complete solutions to a family of Thue equations of degree 12,
  J. Théor. Nombres de Bordeaux 29 (2017) 549-568.
• A. Hoshi, A. Yamasaki, Rationality problem for algebraic tori,
  Mem. Amer. Math. Soc. 248 (2017), no. 1176, v+215 pp.
• A. Hoshi, M. Kang, A. Yamasaki, Rationality problems for relation modules of dihedral groups,
  J. Algebra 530 (2019) 368-401.
• A. Hoshi, M. Kang, A. Yamasaki, Degree three unramified cohomology groups and Noether's problem for groups of order 243,
  J. Algebra 544 (2020) 262-301.
• S. Hasegawa, A. Hoshi, A. Yamasaki, Rationality problem for norm one tori in small dimensions,
  Math. Comp. 89 (2020) 923-940.
• A. Hoshi, H. Kitayama, Three-dimensional purely quasimonomial actions,
  Kyoto J. Math. 60 (2020) 335-377.
• A. Hoshi, M. Koshiba, On Lecacheux's family of quintic polynomials,
  Proc. Japan Acad. Ser. A 97 (2021) 1-6.
• A. Hoshi, A. Yamasaki, Rationality problem for norm one tori,
  Israel J. Math. 241 (2021) 849-867.
• A. Hoshi, M. Kang, H. Kitayama, A. Yamasaki, A two-dimensional rationality problem and intersections of two quadrics,
  Manuscripta Math. 168 (2022) 423-437.
• A. Hoshi, K. Kanai, A. Yamasaki, Norm one tori and Hasse norm principle,
  Math. Comp. 91 (2022) 2431-2458.
• A. Hoshi, K. Kanai, Davenport and Hasse's theorems and lifts of multiplication matrices of Gaussian periods,
  Finite Fields Appl. 84 (2022) Paper No. 102101, 26 pp.
• A. Hoshi, K. Kanai, A. Yamasaki, Norm one tori and Hasse norm principle, II: Degree 12 case,
  J. Number Theory 244 (2023) 84-110.
• A. Hoshi, M. Kang, A. Yamasaki, Multiplicative Invariant Fields of Dimension $\le 6$,
  Mem. Amer. Math. Soc. 283 (2023), no. 1403, vi+137 pp.
• A. Hoshi, A. Yamasaki, Rationality problem for norm one tori for dihedral extensions,
  J. Algebra 640 (2024) 368-384.
• A. Hoshi, H. Kitayama, Rationality problem of two-dimensional quasi-monomial group actions,
  Transform. Groups 29 (2024) 1029-1064.
• A. Hoshi, K. Kanai, A. Yamasaki, Norm one tori and Hasse norm principle, III: Degree 16 case,
  J. Algebra 666 (2025) 794-820.

Refereed Articles & Surveys

• A. Hoshi, K. Miyake, On the field intersection problem of generic polynomials: a survey,
  Algebraic number theory and related topics 2007, 231-247, RIMS Kôkyûroku Bessatsu B12,
  Res. Inst. Math. Sci. (RIMS), Kyoto, (2009).
• A. Hoshi, K. Miyake, Some Diophantine problems arising from the isomorphism problem of generic polynomials,
  Number Theory: Dreaming in Dreams, 87-105, Proceedings of the 5th China-Japan Seminar.
  Edited by T. Aoki, S. Kanemitsu and J. Liu, World Sci. Publ., 2010.
• A. Hoshi, Rationality problem for quasi-monomial actions,
  Algebraic number theory and related topics 2012, 203-227, RIMS Kôkyûroku Bessatsu B51,
  Res. Inst. Math. Sci. (RIMS), Kyoto, (2014).
• A. Hoshi, Noether's problem and rationality problem for multiplicative invariant fields: a survey,
  Algebraic number theory and related topics 2016, 29-53, RIMS Kôkyûroku Bessatsu B77,
  Res. Inst. Math. Sci. (RIMS), Kyoto, (2020).

Ph.D. Dissertation

International Talks

• Noether's problem and Q-generic polynomials, Kolloquium in Universität des Saarlandes (invited by Prof. Rainer Schulze-Pillot), Universität des Saarlandes, Germany, May 27, 2005
• Noether Problems and Q-Generic Polynomials for the Normalizer of the 8-Cycle in S₈, Oberseminar Algebra-Zahlentheorie (invited by Prof. B. Heinrich Matzat), Ruprecht-Karls-Universität Heidelberg, Germany, May 30, 2005
• Noether's problem and Q-generic polynomials for the normalizer of the 8-cycle in S₈ and its subgroups, Vortrag in der Arbeitsgemeinschaft über Algebra (invited by Prof. Gregor Kemper), Technische Universität München, Germany, Jul. 5, 2005
• Noether's problem for Frobenius groups of prime degree up to 23, Conference: Galois groups and algebraic equations (invited by Prof. Ki-ichiro Hashimoto, Masanari Kida and Nobuhiro Terai), Kagoshima University, Japan, Sep. 5, 2005
• (with Katsuya Miyake) Tschirnhausen Transformation of a Cubic Generic Polynomial and a 2-dimensional Involutive Cremona Transformation, International Conference on Number Theory (invited by Prof. Balakrishnan Ramakrishnan and Kalyan Chakraborty), Harish-Chandra Research Institute, India, Dec. 1, 2006
• Tschirnhausen transformation of a cubic generic polynomial and a 2-dimensional involutive Cremona transformation, as a part of NCTS Short Course on Number Theory given by K. Miyake (invited by Prof. Wen-Ching Winnie Li and Jing Yu) National Center for Theoretical Sciences, Math. Division in National Tsing Hua University, Taiwan, Jun. 27, 2007
• Cubic generic polynomials and some Cremona transformations (joint work with K. Miyake), Seminar of Algebra (invited by Prof. Ming-chang Kang), National Center for Theoretical Sciences, Math. Division (Taipei Office) in National Taiwan University, Taiwan, Jul. 26, 2007
• On the field intersection problem of generic polynomials via resolvent polynomials, Foundations of Computational Mathematics (FoCM'08) WORKSHOP C4 Computational number theory (invited by Prof. Hendrik Lenstra, Takakazu Satoh and Peter Stevenhagen), City University of Hong Kong, China, Jun. 24, 2008
• (with Katsuya Miyake) Some Diophantine problems arising from the isomorphism problem of generic polynomials, The 5th Japan-China Seminar on Number Theory (invited by Prof. Shigeru Kanemitsu), Kinki University, Japan, Aug. 27, 2008
• (with Katsuya Miyake) On the field isomorphism problem of generic polynomials via formal Tschirnhausen transformation, The Japan-Korea Joint Seminar on Number Theory and Related Topics 2008 (invited by Prof. Hisao Taya), Tohoku University, Japan, Nov. 12, 2008
• On correspondence between solutions of a parametric family of cubic Thue equations and isomorphism classes of simplest cubic fields, Diophantine Analysis and Related Fields 2009 (DARF 2009) (invited by Prof. Noriko Hirata-Kohno, Masaaki Amou, Ryotaro Okazaki, Takao Komatsu and Isao Wakabayashi), Nihon University, Japan, Mar. 2, 2009
• On the simplest quartic fields and related Thue equations, The Joint Conference of ASCM2009 and MACIS2009, SCM2009 Special Session on Computational Algebraic Number Theory (invited by Prof. Guenael Renault and Kazuhiro Yokoyama), JAL Resort Sea Hawk Hotel Fukuoka, Japan, Dec. 16, 2009
• Rationality problem of three-dimensional monomial group actions (joint work with H. Kitayama and A. Yamasaki), The 5th Affine Algebraic Geometry Meeting (invited by Prof. Kayo Masuda, Hideo Kojima and Takashi Kishimoto), Kwansei Gakuin University, Japan, Mar. 5, 2010
• Three-dimensional monomial group actions (joint work with H. Kitayama and A. Yamasaki), TIMS Lecture, Taida Institute for Mathematical Sciences (invited by Prof. Ming-chang Kang), National Taiwan University, Taiwan, Oct. 22, 2010
• Three-dimensional monomial group actions (joint work with H. Kitayama and A. Yamasaki), TIMS Lecture, Seminar of Algebra (invited by Prof. Ming-chang Kang), National Taiwan University, Taiwan, Oct. 29, 2010
• On the simplest sextic fields and related Thue equations, One-day workshop of algebra (invited by Prof. Ming-chang Kang), NCTS/TPE, National Taiwan University, Taiwan, Aug. 16, 2011.
• Quasi-monomial actions and some 4-dimensional rationality problems, The 9th Affine Algebraic Geometry Meeting (invited by Prof. Takashi Kishimoto, Hideo Kojima and Shigeru Kuroda), Kwansei Gakuin University, Japan, Mar. 3, 2012
• Rationality problem of algebraic tori (I) (joint work with A. Yamasaki), One-day workshop of algebra (invited by Prof. Ming-chang Kang), NCTS/TPE, National Taiwan University, Taiwan, Aug. 16, 2012.
• Rationality problem for fields of invariants: a survey, One-day workshop of algebra (invited by Prof. Ming-chang Kang), NCTS/TPE, National Taiwan University, Taiwan, Aug. 19, 2013.
• (with Aiichi Yamasaki) Rationality problem for algebraic tori, SEOUL ICM 2014, Short Communications, Coex, Seoul, Korea, Aug. 19, 2014.
• Birational classification of fields of invariants for groups of order 128, New Developments in Algebraic Geometry (invited by Prof. Caucher Birkar, Jungkai Alfred Chen, Wu-Yen Chuang and Jeng-Daw Yu), NCTS/TPE, National Taiwan University, Taiwan, Sep. 5, 2014.
• On the simplest number fields and related Thue equations, 29th Journées Arithmétiques (JA2015), University of Debrecen, Hungary, Jul. 9, 2015.
• On the simplest number fields and related Thue equations, The 4th International Congress on Natural Sciences (ICNS2015), Changhua, Taiwan, Sep. 10, 2015.
• Rationality problem for fields of invariants, Workshop: Rationality and selfmaps of algebraic varieties (invited by Prof. Shigeru Mukai and Keiji Oguiso), RIMS, Kyoto University, Japan, Jul. 21, 2016.
• Rationality problem for fields of invariants, Japan-Taiwan Joint conference on Number theory 2016 (invited by Prof. Ming-Lun Hsieh and Masataka Chida), NCTS/TPE, National Taiwan University, Taiwan, Sep. 9, 2016.
• Rationality problem for fields of invariants, Workshop: Researches on isometries from various viewpoints (invited by Prof. Takeshi Miura), RIMS, Kyoto University, Jpan, Oct. 31, 2016.
• Rationality problem for fields of invariants, The 15th Affine Algebraic Geometry Meeting (invited by Prof. Hideo Kojima, Takashi Kishimoto, Adrien Dubouloz and Kayo Masuda), Kwansei Gakuin University, Japan, Mar. 5, 2017.
• Cubic Thue equations and simplest cubic fields, Journées Algophantiennes Bordelaises 2017 (invited by Prof. Yuri Bilu), Institut de Mathématiques de Bordeaux, Université Bordeaux, France, Jun. 8, 2017.
• Unramified Brauer group of multiplicative invariant fields of dimension ≤ 6 (I), NCTS Seminar on Algebra (invited by Prof. Ming-chang Kang), NCTS, National Taiwan University, Taiwan, Sep. 20, 2017.
• Rationality problem for fields of invariants, Kinosaki algebraic geometry symposium 2017 (invited by Prof. Taro Fujisawa, Takuzo Okada and Taro Sano), Kinosaki International Arts Center, Japan, Oct. 25, 2017.
• Rationality problem for fields of invariants and unramified cohomology groups, International Workshop on Algebra (invited by Prof. Jungkai Alfred Chen and Chia-Fu Yu), NCTS, National Taiwan University, Taiwan, Jun. 9, 2018.
• Degree three unramified cohomology groups and Noether's problem for groups of order 243, Séminaire "Variétés Rationnelles" (invited by Prof. Jean-Louis Colliot-Thélène, Cyril Demarche and Mathieu Florence), Université Pierre-et-Marie-Curie (Paris VI), France, Jun. 22, 2018.
• Degree three unramified cohomology groups and Noether's problem for groups of order 243, NCTS Seminar on Algebra (invited by Prof. Ming-chang Kang), NCTS, National Taiwan University, Taiwan, Aug. 12, 2019.
• Rationality problem for fields of invariants, The 41st Symposium on Commutative Algebra (invited by Prof. Tokuji Araya, Mitsuyasu Hashimoto and Futoshi Hayasaka), Kurashiki Seaside Hotel, Japan, Nov. 28, 2019.
• Rationality problem for fields of invariants, Degenerations and models of algebraic varieties and related topics (invited by Prof. Kentaro Mitsui, Ryo Ohkawa, Masa-Hiko Saito and Taro Sano), Zoom (Kobe, Japan), Feb. 16, 2021.
• Rationality problem for fields of invariants, Homotopic and Geometric Galois Theory (invited by Prof. Benjamin Collas, Pierre Debes, Hiroaki Nakamura and Jakob Stix), Zoom (Oberwolfach, Germany), Mar. 9, 2021.
• Rationality problem of two-dimensional quasi-monomial group actions, The 22nd Affine Algebraic Geometry Meeting (invited by Prof. Takashi Kishimoto, Hideo Kojima and Adrien Dubouloz), Niigata University, Mar. 2, 2024.
• Birational classification for algebraic tori, Kinosaki algebraic geometry symposium 2024 (invited by Prof. Yohsuke Matsuzawa, Yusuke Nakamura and Kazuhiko Yamaki), Kyoto Univeristy, Oct. 22, 2024.
• Norm one tori and Hasse norm principle, Bath Arithmetic Geometry Seminar (invited by Prof. Daniel Loughran, Elyes Boughattas, Julian Demeio and Harry Shaw), University of Bath, the United Kingdom, Nov. 5, 2024.
• Norm one tori and Hasse norm principle, London Number Theory Seminar (invited by Prof. Ana Caraiani, George Boxer and Kalyani Kansal), Imperial College London, the United Kingdom, Nov. 6, 2024.
• Rationality problem for fields of invariants, Seminar, Courant Institute of Mathematical Sciences (invited by Prof. Fedor Bogomolov and Yuri Tschinkel), New York University, The United States of America, Dec 16, 2024.
• Birational classification for algebraic tori, Seminar, Courant Institute of Mathematical Sciences (invited by Prof. Yuri Tschinkel), New York University, The United States of America, Dec 19, 2024.

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