Volume 210
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Volume 210
August 5, 2022
Seminar Report
Seminar by Dr. Xavier Roca-Maza on August 3, 2022
2022-08-04
As a part of the RCNP domestic workshop on low-energy nuclear physics and high-energy astrophysics (RCNP研究会「低エネルギー核物理と高エネルギー天文学で読み解く中性子星」), the special seminar entitled "How does subatomic matter organize itself? A low-energy nuclear physics perspective" was given by Prof. Xavier Roca-Maza in U. Milan. This seminar is supported by Gravitational Wave and Equation of State Working Group (GW-EOS WG), RIKEN iTHEMS Program.
The equation of state (EoS) of nuclear matter is one of the essential things in nuclear physics. There have been many attempts to determine parameters characterizing the EoS experimentally, which have become paid attention more. He introduced various attempts and theoretical mechanisms, including cutting-edge proposals.
More than 80 participants attended the seminar, including from the foreign country.
Reported by Tomoya Naito
How does subatomic matter organize itself? A low-energy nuclear physics perspective
August 3 (Wed) at 16:30 - 18:00, 2022
Upcoming Events
Seminar
Testing Astrophysical Models from the Shadow of the Galactic Center Black Hole
August 26 (Fri) at 14:00 - 15:00, 2022
Yosuke Mizuno (T.D. Lee Fellow / Associate Professor, Tsung-Dao Lee Institute, Shanghai Jiao Tong University, China)
We present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A*), the Galactic center source associated with a supermassive black hole. These observations were conducted in 2017 using a global interferometric array of eight telescopes operating at a wavelength 1.3 mm. A variety of imaging and modeling analyses all support an image that is dominated by a bright, thick ring with a diameter of ~50 micro-arcsecond. Using a large suite of numerical simulations, we demonstrate that the EHT images of Sgr A* are consistent with the expected appearance of a Kerr black hole with mass ∼4 million solar mass, which is inferred to exist at this location based on previous infrared observations of individual stellar orbits, as well as maser proper-motion studies. Our model comparisons disfavor scenarios where the black hole is viewed at high inclination (i > 50 deg), as well as non-spinning black holes and those with retrograde accretion disks. Our results provide direct evidence for the presence of a supermassive black hole at the center of the Milky Way. In this talk, I will focus on more theoretical interpretation and model comparison to understand the accretion flow properties nearby Sgr A*.
Venue: via Zoom
Event Official Language: English
Workshop
DM3 - Deep insights and Multiple strategies for Deciphering the Mystery of Dark Matter
September 15 (Thu) - 17 (Sat), 2022
Venue: SUURI-COOL (Kobe), #S704-S705, Integrated Innovation Building (IIB), Kobe Campus, RIKEN / via Zoom
Event Official Language: English
Paper of the Week
Week 1, August 2022
2022-08-04
Title: Stochastic failure of cell infection post viral entry: Implications for infection outcomes and antiviral therapy
Author: Christian Quirouette, Daniel Cresta, Jizhou Li, Kathleen P. Wilkie, Haozhao Liang, Catherine A. A. Beauchemin
arXiv: http://arxiv.org/abs/2208.00637v1
Title: Structure-preserving numerical methods for constrained gradient flows of planar closed curves with explicit tangential velocities
Author: Tomoya Kemmochi, Yuto Miyatake, Koya Sakakibara
arXiv: http://arxiv.org/abs/2208.00675v1
Title: The eco-evolutionary dynamics of prior selfing rates promote coexistence without niche partitioning under conditions of reproductive interference
Author: Koki R. Katsuhara, Yuuya Tachiki, Ryosuke Iritani, Atushi Ushimaru
Journal Reference: Journal of Ecology, Volume109, Issue11, p.3916-3928 (2021)
doi: https://doi.org/10.1111/1365-2745.13768
Title: Partitioning the temporal changes in abundance-based beta diversity into loss and gain components
Author: Shinichi Tatsumi, Ryosuke Iritani, Marc W. Cadotte
Journal Reference: Methods in Ecology and Evolution (2022)
doi: https://doi.org/10.1111/2041-210X.13921
Title: Black Hole as a Bound State of Semi-classical Degrees of Freedom
Author: Yuki Yokokura
arXiv: http://arxiv.org/abs/2207.14274v1
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