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神岡重力波探測器國際研討會 11th KAGRA International Workshop (KIW-11)

16–20 Apr 2024
National Museum of Natural Science
Asia/Taipei timezone

Contribution List

44 out of 44 displayed
  1. 90. PI: Takaaki Kajita
    Takaaki Kajita (Principal Investigator of KAGRA project)
    16/04/2024, 09:30
  2. 91. KAGRA Status ─ Dr. Masaki Ando
    16/04/2024, 09:40
  3. 92. LIGO Status ─ Dr. Begüm Kabagoz *online talk
    16/04/2024, 10:05
  4. 93. Earthquake Effects on KAGRA
    Tatsuki Washimi (NAOJ)
    16/04/2024, 11:00
  5. 94. Recovery of KAGRA from the Erathquake Disaster
    Shinji MIYOKI (Institute for Cosmic Ray Research, The University of Tokyo)
    16/04/2024, 11:15
  6. 95. Monitor system for positions of KAGRA’s cryogenic mirrors and beam spots by Telephoto Camera (TCam)
    Hirotaka Yuzurihara (ICRR, U-tokyo)
    16/04/2024, 11:30
  7. 96. Exploring the Mesoscale Meteorology on the KAGRA Gravitational Wave Detector
    Takaaki Yokozawa (ICRR)
    16/04/2024, 11:45
  8. 97. Virgo Status *online talk
    Yuhang Zhao (APC, Université Paris Cité)
    16/04/2024, 13:30
  9. 98. IGWN ─ Dr. Masaki Ando
    16/04/2024, 13:55
  10. 99. Group Photo
    16/04/2024, 14:20
  11. 100. Machine-Learning Model for Classifying Glitch and Core-Collapse Supernova
    Andy Chen (Institute of Physics, National Yang Ming Chiao Tung University)
    16/04/2024, 16:30
  12. 101. Supernova Gravitational Waves and Protoneutron Star Properties
    Hajime Sotani (RIKEN)
    16/04/2024, 16:45
  13. 102. A Framework for Rapid Parameter Inference of Kilonova Implementing Conditional Variational Autoencoder
    Surojit Saha (Institute of Astronomy, National Tsing Hua University)
    16/04/2024, 17:00
  14. 103. Noise Reduction in KAGRA O4 Data via DeepClean
    Shu-Wei Yeh (National Tsing Hua University)
    16/04/2024, 17:15
  15. 104. KAGRA Calibration for O4 and Beyond with a Global Calibration Scheme
    Dan Chen (NAOJ)
    17/04/2024, 09:30
  16. 105. KAGRA Squeezing Development
    Michael Page (National Astronomical Observatory of Japan)
    17/04/2024, 09:45
  17. 107. Mechanical Loss Measurement System and a New Fabrication Line for Mirror Coating Toward LIGO Voyager
    Daiki Tanabe (Academia Sinica)
    17/04/2024, 10:00
  18. 108. Status of Taiwan-LIGO Instrumentation Group for O5 Observation
    Yuki Inoue (National Central University)
    17/04/2024, 10:15
  19. 109. Discovery Prospects for Heavy Dark Matter in KAGRA
    Martin Spinrath (NTHU)
    17/04/2024, 11:00
  20. 110. GW-Observations of the Central Engine of Core-Collapse Supernovae in the Local Universe
    Maurice van putten (Sejong University)
    17/04/2024, 11:15
  21. 112. Short-time Laplace Transform Analysis for Gravitational Wave from Black Hole Quasinormal Mode
    Nobuyuki Kanda (Osaka Metropolitan University)
    17/04/2024, 11:30
  22. 115. Gravitational Wave Radiometry with Stokes Parameters
    Izumi Kaku (Osaka Metropolitan University)
    17/04/2024, 11:45
  23. 111. Searching for Circularly Polarized SGWB and Investigating Kinematic-Dipole Effects
    Sevgi Karadağ
    17/04/2024, 12:00
  24. 116. Oversea Contributions to KAGRA
    Albert Kong (Institute of Astronomy, National Tsing Hua University, Taiwan), Masaki Ando, Prof. Ray-Kuang Lee (National Tsing Hua University), Sadakazu Haino (IoP, Academia Sinica), Yi Yang (National Yang Ming Chiao Tung University)
    17/04/2024, 14:00
    Oral
    Forum
  25. 113. EPO activities in Taiwan
    Prof. Ray-Kuang Lee (National Tsing Hua University)
    17/04/2024, 16:30
    Oral
    Closing
  26. 114. Closing Remark
    17/04/2024, 16:55
  27. 88. A Framework for Rapid Parameter Inference of Kilonova Implementing Conditional Variational Autoencoder
    Surojit Saha (Institute of Astronomy, National Tsing Hua University)
    Oral

    The coalescence of binary neutron star (BNS) in the event GW170817, leading to the generation of gravitational waves (GW) and accompanied by kilonova (KNe), the electromagnetic (EM) counterpart, has been a prime topic of interest for the Astronomy community in recent times as it provided much insight into multi-messenger astronomy. Since its discovery in 2017, several research teams have put...

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  28. 78. Discovery prospects for heavy dark matter in KAGRA
    Martin Spinrath (NTHU)
    Oral

    We discuss the discovery prospects for kg-scale dark matter with a Yukawa-like long-range interaction in Kamioka Gravitational Wave Detector (KAGRA). We consider the interaction range to be in the order of kilometers, thus the dark matter may interact with multiple KAGRA mirrors simultaneously. The induced signal strain is in many cases dominated by frequencies below about 130 Hz. Due to the...

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  29. 76. Earthquake Effects on KAGRA
    Tatsuki Washimi (NAOJ)
    Oral

    KAGRA is a kilometer-scale gravitational wave (GW) detector situated underground in Kamioka, Japan. The Japanese archipelago is known for its seismic activity, posing a challenge to GW observations and its detector commissioning. This presentation will cover the following topics: (1) seismic motion from earthquakes at the KAGRA site, (2) the impact of earthquakes on the O4a observation...

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  30. 75. Exploring the Mesoscale Meteorology on the KAGRA Gravitational Wave Detector
    Takaaki Yokozawa (ICRR)
    Oral

    KAGRA is the kilometer scale and ground based Gravitational Wave Detector in Japan. There are two characteristics, underground and cryogenic environment. The O4a observation was performed in May and June, 2023.
    For O4a run, various studies about the effect on the mesoscale meteorology to GW detector were performed. Mesoscale meteorology is the study of weather phenomena that occur on a medium...

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  31. 81. Gravitational wave radiometry with Stokes parameters
    Izumi Kaku (Osaka Metropolitan University)
    Oral

    The circular polarized astrophysical gravitational wave backgrounds may exist with detectable SNR for a finite observation time and the sensitivity of detectors, and may become the foreground radiation for observing the circular polarized cosmological gravitational wave background.

    In this work, we developed a new analysis method introducing Stokes parameters into the gravitational wave...

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  32. 89. GW-observations of the central engine of core-collapse supernovae in the Local Universe
    Maurice van putten (Sejong University)
    Oral

    GW observations can probe the central engine of core-collapse supernovae by distinct emission from neutron stars (NS) and black holes (BH). While high-frequency GWs are expected from a NS, relatively low-frequency GWs are expected from a BH-torus system. Scaling of the emission during spin-down of the Kerr BH of mass $M\simeq 2.5M_\odot c^2$ powering GW170817B/GRB170817A predicts an energy...

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  33. 86. KAGRA calibration for O4 and beyond with a global calibration scheme
    Dan Chen (NAOJ)
    Oral

    KAGRA participated in the international collaborative observation run, O4a, for a duration of one month, concluding in June 2023. Currently, the observatory is in the commissioning phase, preparing for subsequent observations. With KAGRA's sensitivity on the rise, precise calibration becomes paramount for accurate scientific results. We utilize auxiliary lasers to apply radiation pressure,...

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  34. 79. KAGRA squeezing development
    Michael Page (National Astronomical Observatory of Japan)
    Oral

    This presentation covers the current development of quantum noise enhancement for future observations of KAGRA. In particular I talk about the implementation of the squeezed light source in the confines of the Kamioka mine. The equipment of the KAGRA detector creates some differences in squeezer design compared to above-ground detectors.

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  35. 85. Machine-Learning model for classifying glitch and core-collapse supernova
    Andy Chen (Institute of Physics, National Yang Ming Chiao Tung University)
    Oral

    Core-collapse supernovae (CCSNe) are one of the new astrophysical events to be detected by the LVK observatory. Also, it is an interesting candidate for multi-messenger analysis due to their EM and neutrino emission. However, GW signals from CCSNe cannot be exactly modeled due to the stochasticity involved in the collapse dynamics and the dependency on many parameters such as the progenitor...

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  36. 84. Mechanical loss measurement system and a new fabrication line for mirror coating toward LIGO Voyager
    Daiki Tanabe (Academia Sinica)
    Oral

    We are developing a facility named Academia Sinica Gravitational Physics Research Facility (ASGRAF) since 2023. One of its main studies is characterization of mirror coatings for LIGO Voyager. We plan to measure mechanical loss, optical loss, and thermal noise of unexplored materials of coating. Our focus is at large coatings in low temperature. We constructed a new gas line in Taiwan...

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  37. 77. Monitor system for positions of KAGRA’s cryogenic mirrors and beam spots by Telephoto Camera (TCam)
    Dr Hirotaka Yuzurihara (ICRR, U-tokyo)
    Oral

    KAGRA is a ground-based gravitational wave telescope at the Kamioka mine in Gifu prefecture, Japan. KAGRA has a Telephoto Camera (TCam) that combines the telescope and a digital camera to monitor four cryogenic mirrors. We developed the monitor system for the positions of the mirrors and the beam spots on mirrors. This talk shows the results of long-term measurements of height changes during...

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  38. 82. Noise Reduction in KAGRA O4 Data via DeepClean
    Shu-Wei Yeh (National Tsing Hua University)
    Oral

    DeepClean is a machine learning-based noise subtraction method that cleans GW strain data by subtracting noise from PEM channels monitoring environmental noises. We compiled the PEM channels to reduce AC power noises from KAGRA’s main power supplies. These channels were used to address AC power noises in KAGRA O4 strain data during offline analysis. In this study, we use DeepClean to remove AC...

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  39. 106. Ole Steuernagel
  40. 87. Recovery of KAGRA from the Erathquake Disaster
    Shinji MIYOKI (Institute for Cosmic Ray Research, The University of Tokyo)
    Oral

    On January 1st, 2024, a 7.6 magnitude earthquake struck near the KAGRA site, marking the most significant seismic tremor in the area of the KAGRA site in the past century. We confirmed no serious damage in the tunnel structure, infrastructure, vacuum system, and cryogenic system according to the almost full inspection for KAGRA. On the other hand, we confirmed that nine of twenty mirror...

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  41. 83. Searching for Circularly Polarized SGWB and Investigating Kinematic-Dipole Effects
    Ms Sevgi Karadağ (Academia Sinica & Istanbul Technical University)
    Poster

    It is predicted by a class of inflationary models that the Universe could have a stochastic gravitational waves background (SGWB) with a circular polarization. The possibility of detecting and characterizing the circular polarization of the SGWB, which is a collection of gravitational waves (GWs) consisting of signals too faint to be resolved individually, and investigating the dipole...

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  42. 74. Short-time Laplace transform analysis for gravitational wave from black hole quasinormal mode
    Nobuyuki Kanda (Osaka Metropolitan University)
    Oral

    Many gravitational waves from black hole mergers have been observed, and their science has attracted attention.
    We have developed a filter using the Laplace transform to analyze gravitational waves from black hole quasinormal mode oscillations, which are predicted to be properties of spacetime around black holes.
    The Laplace transform has an algebraically clear solution for a damped sine...

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  43. 80. Status of Taiwan-LIGO instrumentation group for O5 observation
    Yuki Inoue (National Central University)
    Oral

    One of the most exciting discoveries of this century was the direct detection of the gravitational waves (GWs) with the Advanced LIGO and Advanced Virgo experiments. The frontier of gravitational wave science is gradually transitioning from the first detection phase to precision verification phase with statistics of gravitational wave events. Taiwan-LIGO instrumentation group have joined LIGO...

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  44. 73. Supernova gravitational waves and protoneutron star properties
    Hajime Sotani (RIKEN)
    Oral

    The gravitational waves from supernovae should be the promising source next to those from compact binary mergers. But, they must be quite weak signal compared to the binary mergers, because the system is more or less spherically symmetric. In addition, the gravitational waves from the supernovae must depend on the supernova model, such as EOS for dense matter and progenitor mass. So, if any,...

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