Tag: workshop

Gravitational Wave Background Found in Pulsar Timing Arrays: Implications for Merging Supermassive Black Holes

Coordinators: Luke Kelley, Chiara Mingarelli, and Gabi Sato-Polito 

The recent observation of nanohertz gravitational waves by Pulsar Timing Arrays (PTAs) has opened a new observational window into the universe. Although the origin of the signal has yet to be determined, the measured gravitational-wave background may be produced by a collection of in-spiralling supermassive black holes (SMBHs) or by physics beyond the standard model. The evidence for this background therefore offers unique insights into the astrophysics of SMBHs and potentially new physics. This Rapid Response Workshop will solely focus on the scientific implications for SMBHs of this first PTA detection bringing together experts on both theory and observations.

Workshop Website

Fundamental aspects of black holes have been actively studied so far to unravel the mystery of black holes and to achieve new physics like the quantum theory of gravity. Black holes are the simplest astrophysical objects in the Universe as each black hole can be characterized by a few parameters only in general relativity. For this reason, they are regarded as the best sites to probe new physics.

Given the recent developments in observational and theoretical progress in black hole physics, it is important for theoretical physicists to discuss how we can unravel the mysteries of black holes, probe new physics, and test existing theories from both fundamental and observational points of view.

This workshop aims to bring together experts working on astrophysical and fundamental aspects of black holes to share ideas and expertise and to offer introductory talks to learn relevant state-of-the-art knowledge.

Invited Speakers (*=tbc)

Yanbei Chen (Caltech)
Katy Clough (Queen Mary U. of London)
Astrid Eichhorn (Southern Denmark U.)
Akihiro Ishibashi (Kindai U.)
Paolo Pani (Sapienza U. of Rome)
Chia-Hsien Shen (Natl. Taiwan U.)
*Sergey Sibiryakov (Perimeter Inst.)
Takahiro Tanaka (Kyoto U.)

Contact
gravity2025(at)yukawa.kyoto-u.ac.jp

Organizers
Katsuki Aoki, Antonio De Felice, Francesco Di Filippo, Mohammad Ali Gorji, Shinji Mukohyama, Naritaka Oshita (Chair), Masroor C. Pookkillath, Kazufumi Takahashi

Workshop Website

JGRG is the community of researchers in Japan, working on General relativity and Gravitation. JGRG has hosted an annual workshop series under the same title since 1991. The main purpose of the workshop is to provide a venue for exchanging ideas to pursue future trends of research. The workshop covers a wide range of topics related to general relativity and gravitation.

Date & Venue

December 2 (Mon) – December 6 (Fri), 2024
HigashiOsaka Campus, Kindai University, Osaka

Invited Speakers

• Vitor Cardoso (Niels Bohr Institute/Lisbon IST)
• Shasvath Kapadia (IUCAA)
• Jutta Kunz (University of Oldenburg)
• Pablo A. Cano (ICC, University of Barcelona)
• Guo-Chin Liu (Tamkang University)
• Kent Yagi (University of Virginia)
• Hirotaka Yuzurihara (ICRR)
• and more

Registration

Registration form:
Please register from here.
Registration is free of charge.
We do not offer live streaming of sessions or provide recorded presentations.

Important dates

• September 25 (24:00 JST): Deadline for travel support, Visa support
• October 15 (24:00 JST): Deadline for abstract submission
• October 30: Deadline for registration (without presentation)

Travel Support
We offer travel support for domestic participants, particularly students. If you would like to request travel support, please indicate this in the registration form. As our budget for travel support is limited, we may not be able to accommodate all requests.

Programme

Dec. 2 (Mon) – Reception: 9:30 – 10:30, Opening: 10:30 – 10:45
Dec.4 (Wed) – Banquet: 18:00- 20:00
Dec.6 (Fri) – Award & Closing: 12:00 – 12:30

Participant List – TBA

Banquet – Date: Dec. 4th (Wed) 18:00-20:00

Place: THE CHARGING PIT&DINER (Building No.7) [Japanese]Price: TBA (cash only)

Scientific Organizing Committee

Hideki Asada (Hirosaki U.), Tomohiro Harada (Rikkyo U.), Kenta Hotokezaka (RESCEU), Akihiro Ishibashi (Kindai U.), Yosuke Itoh (Osaka Metropolitan U.), Keisuke Izumi (Nagoya U.), Sugumi Kanno (Kyushu U.), Kohei Kamada (HIAS, UCAS, Hangzhou), Tsutomu Kobayashi (Rikkyo U.), Kazunori Kohri (NAOJ), Koutarou Kyutoku (Chiba U.), Kei-ichi Maeda (Waseda U.), Hayato Motohashi (Kogakuin U.), Shinji Mukohyama (YITP), Keiju Murata (Nihon U.), Atsushi Nishizawa (Hiroshima U.), Toshifumi Noumi (University of Tokyo), Masato Nozawa (Osaka Institute of Technology), Ryo Saito (Yamaguchi U.), Hisa-aki Shinkai (Osaka Institute of Technology), Teruaki Suyama (Tokyo Institute of Technology), Takahiro Tanaka (Kyoto U.), Takashi Torii (Osaka Institute of Technology), Shinji Tsujikawa (Waseda U.), Masahide Yamaguchi (IBS/ Tokyo Institute of Technology), Kazuhiro Yamamoto (Kyushu U.), Shuichiro Yokoyama (Nagoya U.), Chul-Moon Yoo (Nagoya U.), Hirotaka Yoshino (Osaka Metropolitan U.)

Local Organizing Committee

Kaiki Taro Inoue, Akihiro Ishibashi, Yosuke Itoh, Yoshinori Matsuo, Ken-ichi Nakao, Masato Nozawa, Hisa-aki Shinkai, Takashi Torii, Hirotaka Yoshino

Workshop Website

From astrophysics to high-energy physics, from information theory to quantum gravity, black holes have acquired an ever increasing role in fundamental physics, and are now part of the terminology of many important branches of observational, theoretical and mathematical physics.

The Black Holes Workshops gather researchers working on physical and mathematical problems of black holes, both in their classical and quantum aspects, as well as their connections to general relativity and gravitation, string theory, cosmology, and astrophysics, and stimulate the interaction between all these issues.

The seventeenth edition of the Black Holes Workshop celebrates landmark contributions in the history of black holes and gravitation, namely the 50 years of the Hawking radiation, the 50 years of the discovery of the Hulse and Taylor pulsar, and the 75 years of the Gödel solution.

The workshop will take place at the University of Aveiro, in December 19 and 20, 2024. Researchers on black holes in all their aspects are invited to participate. Registration for the event will start on September 16th and end on December 2nd. The deadline to submit abstracts is November 22nd. A limited number of accepted contributions will be selected, taking into account their scientific merit. Submissions of abstracts after the deadline will not be allowed. Please follow the registration instructions.

In this edition there will be no registration fee for participants.

Workshop Website

The Banff International Research Station will host the “Detection and Analysis of Gravitational Waves in the era of Multi-Messenger Astronomy: From Mathematical Modelling to Machine Learning” workshop in Banff from November 17 - 22, 2024.

Gravitational waves are a new way to explore the sky and uncover the Universe’s deepest mysteries. In the last few years, tens of gravitational-wave detections have allowed scientists to harness the potential of gravitational waves in testing Einstein’s General Relativity theory under extreme conditions, helping to understand the origin of dense matter, measuring the Hubble constant, and estimating the population of black holes in the Universe.

Researchers from all around the world are gathering in Banff to discuss new, recent results from the LIGO, Virgo and KAGRA detectors and the future of gravitational-wave science. The workshop “Detection and analysis of gravitational waves in the era of multi-messenger astronomy: From mathematical modelling to machine learning”, a second in its series, provides a forum, unique in its genre, for discussing new mathematical methods in modelling, detecting, and analyzing gravitational waves, as well as their integration with machine learning and artificial intelligence.

The Banff International Research Station for Mathematical Innovation and Discovery (BIRS) is a collaborative Canada-US venture that provides an environment for creative interaction as well as the exchange of ideas, knowledge, and methods within the Mathematical Sciences, with related disciplines and with industry. The research station is located at The Banff Centre in Alberta and is supported by Canada’s Natural Science and Engineering Research Council (NSERC), the U.S. National Science Foundation (NSF), and the Government of Alberta.

BIRS sits on the traditional territory of the Stoney Nakoda Nations of Wesley, Chiniki, and Bearspaw; three Blackfoot Confederacy nations: the Pikani, Kainai, and Siksika; and the Tsuut’ina First Nations, and is shared with the Métis Nation of Alberta. Before provincial boundaries were established, the Ktunaxa and Maskwacis people lived in this territory as well. For decades, these peoples have contributed to preserve this land, honoring and cherishing it as a place of knowledge and healing. We invite you to follow in their footsteps and join us in celebrating human creativity, cooperation, and learning.

Organizers

Marco Cavaglia (Missouri University of Science and Technology)
Jade Powell (Swinburne University of Technology)
Elena Cuoco (European Gravitational Observatory)
Shaon Ghosh (Montclair State University)

Workshop Website

The first three days will be workshop-style with invited and contributed talks. The last day will be dedicated to technical demonstrations and satellite meetings. The event will be hybrid with an in-person, on-site venue and the possibility to join virtually.  For those attending in person, there will be a social reception during the evening of Tuesday, October 15, and a dinner on Thursday, 17th.

As advances in experimental methods create growing datasets and higher resolution and more complex measurements, machine learning (ML) is rapidly becoming the major tool to analyze complex datasets over many different disciplines. Following the rapid rise of ML through deep learning algorithms, the investigation of processing technologies and strategies to accelerate deep learning and inference is well underway. We envision this will enable a revolution in experimental design and data processing as a part of the scientific method to accelerate discovery greatly. This workshop is aimed at current and emerging methods and scientific applications for deep learning and inference acceleration, including novel methods of efficient ML algorithm design, ultrafast on-detector inference and real-time systems, acceleration as-a-service, hardware platforms, coprocessor technologies, distributed learning, and hyper-parameter optimization.

Abstract submission deadline: September 16th, 2024
Registration deadline: October 1st,2024

Workshop Website

The LISA Consortium’s Simulation and LDC Groups are happy to invite you to the LISA Data Generation and Analysis Workshop, which will take place online October 7-10 2024. It is aimed at beginners to LISA data analysis (with hands-on getting-started sessions), as well as more expert individuals who want to learn more (with in-depth sessions on simulation and analysis of sources of various types).

Hands-on tutorial sessions on how to generate simulated datasets (similar to LDC datasets) and run parameter estimation on them. It will include 101-level sessions, as well as more in-depth sessions. The end-goal is to work towards including multiple types of sources in the mini-global fit pipeline.

The workshop will cover 4 sessions (European afternoons, North-American mornings), including

A 4-hour “getting started” hands-on tutorial, where we will generate of a simple LDC-like dataset with realistic instrumental noise and one MBHB signal, then run an MCMC on it to recover the source parameters. A 3-hour “in-depth simulation” hands-on tutorial, where the parametrization of the instrumental noise and various effects (such as nonstationary noise and data artifcats) will be demonstrated, as well as realistic time-domain EMRI, Galactic binary ensemble, and SGWB signals. Two 3-hour “in-depth analysis” hands-on tutorials, where a mini-global fit will be constructed, including inference for a Galactic binary population, MHBHs, and instrument noise.

This workshop is open to all. However, some tools might have restricted access to LISA Consortium associated or full members.

The workshop is organized by the junior chairs of the LISA Consortium Simulation Expert Group and the LISA Data Challenge Working Group. Many thanks to the speakers, who agreed to help with the organization of the tutorials, and in particular:

• Jean-Baptiste Bayle (University of Glasgow)
• Quentin Baghi (APC)
• Eleonora Castelli (NASA GSFC)
• Natalia Korsakova (APC)
• Christian Chapman-Bird (University of Glasgow)
• Henri Inchauspé (Universität Heidelberg)
• Martin Staab (Observatoire de Paris)
• Maude Le Jeune (APC)
• Michael Katz (NASA Marshall)
• Nikolaos Karnesis (AUTh)
• Olaf Hartwig (AEI Hannover)
• Senwen Deng (APC)
• Sylvain Marsat (L2I Toulouse)

Workshop Website

This workshop will foster an interdisciplinary discussion about how ongoing and future observations of gravitational and electromagnetic waves can be used to shed light on the physics of compact-object formation and evolution.

We will bring together experts on:

• (i) parameter estimation from gravitational-wave data;
• (ii) astrophysical modeling of gravitational-wave sources and their electromagnetic counterparts; and
• (iii) gravitational-wave “data mining”.

This meeting will bring together astronomers and gravitational-wave scientists whose current research covers these three topics. The key questions we aim to address in the meeting are:

• how can gravitational-wave parameter estimation be integrated with other forms of astronomy to gain a more comprehensive understanding of compact-object mergers?
• How can gravitational-wave data help us understand the astrophysical processes and environments involved?
• What improvements are required for stellar/binary evolution models, cluster dynamics, and galactic nuclei for a meaningful comparison to the data?
• How can we use modern statistical tools to maximize the astrophysical information extracted from the gravitational-wave data?

This workshop accepts applicants! Application dadline: 21st of July 2024.

Workshop Website

The key objective of this workshop is to develop and disseminate a research agenda on interconnecting software tools in real-time multi-messenger astronomy. This international conference provides a forum for leading scientists and young researchers to foster communication within the community between developers and users with a range of expertise in the production and use of software tools that facilitates life in rapidly evolving real-time multi-messenger astronomy.

Workshop Website

Join us to explore the uncharted milli-Hertz regime of the gravitational wave spectrum, a domain soon to be unlocked by space missions. With a special emphasis on the Laser Interferometer Space Antenna (LISA) mission, our workshop also broadens its scope to include other milli-Hertz missions and aims to explore synergies with the next generation of ground-based gravitational wave detectors.

The milli-Hertz regime is unique due to the variety of gravitational wave sources emitting at these frequencies, including binaries of stellar remnants such as white dwarfs, neutron stars, and black holes within our own Galaxy, as well as inspiraling compact objects onto massive black holes (aka Extreme/Intermediate Mass Ratio Inspirals,

E/IMRI)  and mergers between nascent massive black holes (MBH) at cosmic dawn. This regime is also unique in terms of waveform modelling, data analysis and data interpretation, presenting challenges that call for a community-driven approach.

Our workshop will bring together leading experts and early career scientists in the field of theoretical modelling (from astrophysics to numerical relativity), electromagnetic observations, and gravitational wave data analysis, aiming to prepare the community for the new kind of gravitational wave data and to enable groundbreaking astrophysics in the milli-Hertz regime. The format will balance scientific talks, interactive tutorials, and open discussions, creating an ideal environment for initiating new collaborations and consolidating ongoing projects. More broadly, we strive to foster a community where interdisciplinary and creative collaborations can flourish.

Week 1 (30th June – 4th July): Astrophysical Modelling and Uncertainties

• Review and assess state-of-the-art astrophysical models.

• Identify gaps and uncertainties in mHz GW source modelling.

Key topics to be discussed include:

– Robustness of stellar binary modelling against assumptions on stability of mass transfer, accretion onto compact objects, common envelopes, and tides.

– Predicting MBH binaries/EMRI/IMRI event rates and their key waveform properties.

– Existence and distribution of intermediate-mass black holes.

– Synergies with upcoming electromagnetic surveys.

Week 2 (7th – 11th July): Waveform Modelling Challenges

• Outline a road-map for addressing challenges in waveform modelling before 2030s.

• Access the required waveform accuracy for the mHz data analysis.

Key questions to be discussed include:

– Integrating post-Newtonian and numerical relativity simulations to provide predictions for waveforms under realistic orbital configuration of the mHz GW sources.

– Explore the possibility of extending black hole perturbation theory for IMRIs.

– Including environmental effects in GW waveforms.

– Advances and applicability of emerging methods based on effective field theory and amplitude scattering techniques.

Week 3 (14th – 18th July): Data Analysis and Parameter Estimation

• Discuss data analysis complexities; in particular challenges of the “global fit” approach.

• Focus on precise source parameter estimation and accurate source subtraction to facilitate the analysis of stochastic backgrounds.

Key questions to be discussed include:

– Utilising electromagnetic observations of Galactic binaries for instrument noise estimation.

– Identify waveforms that effectively capture the diversity and complexity of astrophysical populations for each source type while optimising computational efficiency.

– Formulate astrophysically motivated priors for the global fit analysis.

– Discuss strategies for extracting astrophysical sources from GW data to analyse stochastic signals.

Week 4 (21st – 25th July): Data Interpretation via Astrophysical Models

• Build upon insights from previous weeks’ discussions to explore the scientific interpretation of mHz GW data using astrophysical models.

• Develop astrophysics-focused mock data challenges to prepare the community for future data interpretation.

Key questions to be discussed include:

– Re-discovering our Galaxy using mHz GW detections.

– Understanding MBH formation through GW detections.

– Leveraging GW event rates to study physical processes in galactic nuclei.

– Identifying promising electromagnetic counterparts for mHz GW sources

Workshop Website