Kazuya Takahashi

Profile

• Postdoc, majoring in theoretical astrophysics
• [Curriculum Vitae]

Present Affiliation & Contact

• Research Center for the Early Universe (RESCEU), University of Tokyo

• kazuya.takahashi★resceu.s.u-tokyo.ac.jp (★ = at)
• kazuya.takahashi★yukawa.kyoto-u.ac.jp (★ = at)

Papers

1. Gravitational wave physics and astronomy in the nascent era
   M. Arimoto et al. (including K. Takahashi as one in the authors; 2023), Progress of Theoretical and Experimental Physics, 2023, 10A103
   [arXiv] [PTEP] [ADS]
2. Probing particle acceleration at trans-relativistic shocks with off-axis gamma-ray burst afterglows
   K. Takahashi, K. Ioka, Y. Ohira & H. J. van Eerten (2022), Monthly Notices of the Royal Astronomical Society, 517, 5541
   [arXiv] [MNRAS] [ADS]
3. Diverse jet structures consistent with the off-axis afterglow of GRB 170817A
   K. Takahashi & K. Ioka (2021), Monthly Notices of the Royal Astronomical Society, 501, 5746
   [arXiv] [MNRAS] [ADS]
4. Inverse reconstruction of jet structure from off-axis gamma-ray burst afterglows
   K. Takahashi & K. Ioka (2020), Monthly Notices of the Royal Astronomical Society, 497, 1217
   [arXiv] [MNRAS] [ADS]
5. A mechanism for triple-ridge emission structure of AGN jets
   T. Ogihara, K. Takahashi & K. Toma (2019), The Astrophysical Journal, 877, 19
   [arXiv] [ApJ] [ADS]
6. Linear analysis of the shock instability in core-collapse supernovae: Influence of acoustic power and fluctuations of neutrino luminosity
   K. Sugiura, K. Takahashi & S. Yamada (2019), The Astrophysical Journal, 874, 28
   [arXiv] [ApJ] [ADS]
7. Parabolic jets from the spinning black hole in M87
   M. Nakamura et al. (including K. Takahashi as the 10th author; 2018), The Astrophysical Journal, 868, 146
   [arXiv] [ApJ] [ADS]
8. Fast-spinning black holes inferred from symmetrically limb-brightened radio jets
   K. Takahashi, K. Toma, M. Kino, M. Nakamura & K. Hada (2018), The Astrophysical Journal, 868, 82
   [arXiv] [ApJ] [ADS]
9. On the importance of progenitor asymmetry to shock revival in core-collapse supernovae
   H. Nagakura, K. Takahashi & Y. Yamamoto (2018), Monthly Notices of the Royal Astronomical Society, 483, 208
   [arXiv] [MNRAS] [ADS]
10. Links between the shock instability in core-collapse supernovae and asymmetric accretions of envelopes
    K. Takahashi, W. Iwakami, Y. Yamamoto & S. Yamada (2016), The Astrophysical Journal, 831, 75
    [arXiv] [ApJ] [ADS]
11. Linear analysis on the growth of non-spherical perturbations in supersonic accretion flows
    K. Takahashi & S. Yamada (2014), The Astrophysical Journal, 794, 162
    [arXiv] [ApJ] [ADS]
12. Exact Riemann solver for ideal magnetohydrodynamics that can handle all types of intermediate shocks and switch-on/off waves
    K. Takahashi & S. Yamada (2014), Journal of Plasma Physics, volume 80, issue 02, pp. 255-287
    Selected as one of the Featured Articles of the journal (May 2015)
    [arXiv] [JPP] [ADS]
    
13. Regular and non-regular solutions of the Riemann problem in ideal magnetohydrodynamics
    K. Takahashi & S. Yamada (2013), Journal of Plasma Physics, volume 79, issue 03, pp. 335-356
    [arXiv] [JPP] [ADS]

International Conferences

1. Imaging jet structures with gamma-ray burst afterglows
   K. Takahashi, K. Hotokezaka & K. Ioka, The 14th RESCEU International Symposium; From Large to Small Structures in the Universe, 30 Oct.-2 Nov. 2023, Tokyo, Japan (Talk)
2. Probing particle acceleration at trans-relativistic shocks with off-axis gamma-ray burst afterglows
   K. Takahashi, K. Ioka, Y. Ohira & H. van Eerten, Symposium on gravitational wave physics and astronomy: Genesis, 25-29 Apr. 2022, Kyoto, Japan (Talk)
3. Probing the particle acceleration at trans-relativistic shocks with gamma-ray burst afterglows
   K. Takahashi, K. Ioka, Y. Ohira & H. van Eerten, ICRC 2021, 12-23 Jul. 2021, Berlin, Germany (Virtual) (Talk)
4. Diverse jet structures consistent with the off-axis afterglow of GRB 170817A
   K. Takahashi & K. Ioka, The fourth annual area symposium online, 22 & 24 Feb. 2021, Online hosted by IPMU, U. Tokyo (Talk)
5. Diverse jet structures consistent with the off-axis afterglow of GRB 170817A
   K. Takahashi & K. Ioka, Black Hole Astrophysics with VLBI: Multi-Wavelength Era, 18 Jan. - 20 Jan. 2021, Online hosted by ICRR, U. Tokyo (Talk)
6. Inverse reconstruction of jet structure from off-axis gamma-ray burst afterglows
   K. Takahashi & K. Ioka, The third annual symposium of the innovative area "Gravitational Wave Physics and Astronomy: Genesis" (Konan-gakuen 100th anniversary international scientific symposium series), 10 Feb. - 12 Feb. 2020, Kobe, Japan (Talk)
7. Inverse reconstruction of jet structure from off-axis gamma-ray burst afterglows
   K. Takahashi & K. Ioka, Yamada Conference LXXI: Gamma-ray Bursts in the Gravitational-wave Era 2019, 28 Oct. - 1 Nov. 2019, Yokohama, Japan (Talk)
8. Inverse reconstruction of jet structure from off-axis gamma-ray burst afterglows
   K. Takahashi & K. Ioka, YITP long-term workshop: Multi-Messenger Astrophysics in the Gravitational Wave Era, 24 Sep. - 25 Oct. 2019, Kyoto, Japan (Talk)
9. Inverse reconstruction of jet structure from off-axis gamma-ray burst afterglows
   K. Takahashi & K. Ioka, Workshop to bring together experts on high energy astrophysics from Japan and Israel, 18 Jul. - 23 Jul. 2019, RIKEN Wako/Kobe Campuses, Japan (Invited Talk)
10. Inverse problem of reconstructing the jet energy distribution from afterglow light curves
    K. Takahashi & K. Ioka, The second annual symposium of the innovative area "Gravitational Wave Physics and Astronomy: Genesis", 26 Nov. - 28 Nov. 2018, Kyoto, Japan (Talk)
11. Jet energy distribution inferred from afterglow light curves
    K. Takahashi & K. Ioka, Jet and Shock Breakouts in Cosmic Transients, 14 May - 18 May 2018, Kyoto, Japan (Invited Talk)
12. Parameter dependence of limb-brightening emission from AGN jets
    K. Takahashi, K. Toma, M. Kino, M. Nakamura & K. Hada, Dawn of a new era for black hole jets in active galaxies, 25 Jan. - 27 Jan. 2018, Sendai, Japan (Talk)
13. Radio emission from the relativistic jet of M87
    K. Takahashi, K. Toma, M. Kino, M. Nakamura & K. Hada, Challenges of AGN Jets, 17 Jan. - 20 Jan. 2017, Mitaka, Japan (Talk)
14. Links between the shock instabilities and asymmetric accretions of envelopes
    K. Takahashi, W. Iwakami, Y. Yamamoto & S. Yamada, 2nd NAOJ-ECT* Workshop on Many Riddles About Core-Collapse Supernovae: 1 Bethe and Beyond, 27 Jun. - 1 Jul. 2016, Mitaka, Japan (Talk)
15. Standing Accretion Shock Instability Revisited
    K. Takahashi, Y. Yamamoto, W. Iwakami & S. Yamada, Numazu Workshop 2015: Challenges of modeling supernovae with nuclear data, 1 Sep. - 4 Sep. 2015, Mishima, Japan (Poster)
16. Study on the growth and time-variability of fluctuations in super-sonic flows: toward more realistic investigations on standing accretion shock instability
    K. Takahashi & S. Yamada, Multi-Messengers from Core-Collapse Supernovae (MMCOCOS), 2 Dec. - 6 Dec. 2013, Fukuoka, Japan (Poster)
17. On the existence and non-uniqueness of solutions of Riemann problems in ideal magnetohydrodynamics
    K. Takahashi & S. Yamada, ASTRONUM 2013 (8th International Conference on Numerical Modeling of Space Plasma Flows), 1 Jul. - 5 Jul. 2013, Biarritz, France (Talk)

Lectures

• Fluid Dynamics I (language: Japanese), Konan University, Sep. 2021 - Mar. 2022
• Fluid Dynamics I (language: Japanese), Konan University, Sep. 2020 - Mar. 2021
• Fluid Mechanics (language: English), Waseda University, Oct. 2015 - Mar. 2016

Public Outreach Activities

• On-demand Lecture on Gamma-ray Bursts, University of Tokyo Open Campus, Aug. 2022
  [YouTube]
• Assistant of "the Black Hole Camera", Katahira Festival 2017 - Open House of Tohoku University's Research Institutes and Center, 6 Oct. - 7 Oct. 2017
• Poster Presenter for Astronomical Institute, Tohoku University Open Campus, 25 Sep. - 26 Sep. 2017
• Poster Presenter for Astronomical Institute, Tohoku University Open Campus, 27 Sep. - 28 Sep. 2016

Links

• Research Center for the Early Universe in University of Tokyo
• Center for Gravitational Physics in YITP, Kyoto University
• Yukawa Institute for Theoretical Physics in Kyoto University
• Theoretical astrophysics group in Tohoku University
• High-energy astrophysics group in Waseda University
• Progress of Theoretical and Experimental Physics (Oxford University Press)
• Monthly Notice of the Royal Astronomical Society (Oxford University Press)
• The Astrophysical Journal (IOP Publishing)
• Journal of Plasma Physics (Cambridge University Press)
• The Physical Society of Japan
• Rironkon
• The Astronomical Society of Japan
• GRB Seminar Log
• GraceDB
• GCN Circulars