Author: Marcus Mohring

The third edition of the workshop on Bayesian Deep Learning for Cosmology and Time Domain Astrophysics for registration . It will be held in Paris, France from May 20th to 23rd 2025.

The goal of this series of workshops is to bring together physicists and machine learning specialists to exchange recent results at the crossroads between cosmology, time-domain astrophysics and probabilistic machine learning frameworks to leverage uncertainties.

Reduced registration fees will be available for students, Please follow the indications on the registration website for grant applications.

The first day of the workshop will be structured as a school to introduce the Bayesian framework and probabilistic machine learning concepts. The rest of the workshop will alternate between keynote talks, topical presentations, interactive tutorials and poster sessions.

*Call for contributions : open until May 10th *

We welcome in particular contributions that target, or report on, the following non-exhaustive list of topics

• Applications of Bayesian Deep Learning in Cosmology and Time Domain Astrophysics
• Methodology for Model Uncertainty Quantification
• Anomaly and outlier detection
• Probabilistic ML frameworks and methodology
• Use of Bayesian deep learning outside of academia
• Ethical and environmental considerations of large-scale machine learning

Contributions do not necessarily need to be astrophysics-focused. Work
on relevant ML methodology, or similar considerations in other
scientific fields are welcome.

Confirmed keynote speakers and panelists :

Federica Bianco (remote), University of Delaware, LSST Rubin TVS collaboration
Alexandre Boucaud, APC
Samuel Farrens, Cosmostat AIM
François Lanusse, Cosmostat AIM
Konstantin Leyde, ICG Portsmouth
Anaïs Möller (remote), Swinburne University of Technology
Julien Peloton, IJCLab
Justine Zeghal, Université de Montréal, MILA

More information is available on the workshop website.

The upcoming workshop "Gravitational Waves meet Nuclear Astrophysics" will be held from July 7-11, 2025. The workshop will be hosted by the Nicholas and Lee Begovich Center for Gravitational-Wave Physics and Astronomy at California State University, Fullerton.

Our goal is to bring researchers from multiple fields together to understand how gravitational-wave astronomy will help us understand the dense matter equation of state and heavy-element nucleosynthesis in our universe. As gravitational wave astronomy opens new windows into the high-energy cosmos, nuclear astrophysics provides the keys to understanding the fundamental processes powering these cosmic events—from supernovae to neutron star mergers and beyond. Talks and working sessions will build connections across work in gravitational-wave rates, source populations, chemical evolution, nuclear reactions, nuclear equation of state, nucleosynthesis, hydrodynamic simulations, and transient astronomy.

SOC:

• Floor Broekgaarden, UC San Diego
• Maya Fishbach, Canadian Institute for Theoretical Astrophysics
• Alex Ji, University of Chicago
• Jocelyn Read, California State University Fullerton
• Achim Schwenk, TU Darmstadt
• Rahul Somasundaram, Los Alamos National Laboratory
• Nicole Vassh, TRIUMF

Workshop Website

As the detection of a stochastic gravitational wave background from the early universe becomes increasingly promising, signals from hypothetical first-order phase transitions are attracting growing interest. Predicting these signals often requires the solution of plasma dynamics at macroscopic scales, which, in turn, depends on the phenomena that characterize the phase transition at microscopic scales.  Therefore, various assumptions on distinctive scales and their separation are usually employed to enable concrete evaluations. 
This workshop aims to bring together researchers from both the microscopic and macroscopic communities to collaboratively address theoretical shortcomings and refine current gravitational wave spectral templates across different regimes.

1. Microscopic scales – Quantitative uncertainties affect the fundamental phase transition par
   Advancing gravitational wave predictions from cosmological first-order phase transitions parameters within minimal scenarios beyond the Standard Model, where a scalar field drives the symmetry-breaking mechanism.
2. Intermediate scales – Different approaches have been employed to describe the interactions between the scalar field and the plasma, including bubble wall dynamics and plasma viscosity. A key question is, e.g., whether the bubble wall runs away or reaches a terminal velocity.
3. Macroscopic scales – Several approximations are used to connect to large-scale phenomena during and after the phase transition, such as collisions between the bubbles, the development of turbulence, and the evolution of sound shells.

Workshop Website

LIGO’s discovery of gravitational waves in 2015 has led to a new era in astronomy. By the mid-2030s, we will be able to observe astrophysical gravitational-wave sources across multiple frequency bands, which will greatly advance our understanding of the physical Universe. Asymmetric binary systems will be a main source of gravitational waves, particularly in the multi-band era. The best way to model them is to expand Einstein’s field equations about the small mass ratio of the system. This use of perturbation theory in the relativistic two-body problem has been advanced in modern times by independent groups in different ways, which can make it difficult for the various approaches to be compared for consistency. Asymmetric binaries also bring about unique mathematical challenges in the statistical analysis of their gravitational-wave signals in detector data, as well as their broader characterisation in the active astrophysical environments where they typically form.

This week-long IMS workshop provides a chance for researchers from relevant communities to work together on solving the remaining challenges in the modelling and interpretation of gravitational waves from asymmetric binary systems. The workshop will be structured along three main themes: theory, computation, and science. Each theme will be addressed through a combination of invited talks and discussion sessions. The first of the invited talks in each theme will be a keynote talk that reviews the history and current status of research under that theme. Each subsequent talk will target a key challenge under each theme, and will be delivered by a leading expert on that specific topic. The discussion sessions will then expand upon the various topics covered by the invited talks, and will be chaired by relevant experts who will initiate and guide discourse among all the attendees of the workshop.

Organizing Committee

Co-chairs

Alvin Chua (National University of Singapore )
Soichiro Isoyama (National University of Singapore )
Josh Mathews (National University of Singapore )

Scientific Committee

Leor Barack (University of Southampton, UK)
Jonathan Gair (Max Planck Institute for Gravitational Physics, Germany)
Scott Hughes (Massachusetts Institute of Technology, USA)
Takahiro Tanaka (Kyoto University, Japan)

Workshop Website