Talks

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The Future of Gravitational-Wave Astronomy
Monday, 27 October 2025
Time Speaker Title Resources
09:30 to 10:10 Bruce Allen (Albert Einstein Institute, Hannover, Germany) GW sources across frequency bands
 
10:10 to 10:30 Ish Gupta (University of California, Berkeley, USA) GW astronomy from ground
 
10:30 to 10:50 A. Gopakumar (TIFR, Mumbai, India) GW astronomy using pulsar timing arrays
 
10:50 to 11:10 Jan Harms (Gran Sasso Science Institute, L'Aquila, Italy) Deci-Hz GW astronomy
   
11:10 to 11:30 Enrico Barausse (SISSA, Trieste, Italy) LISA astrophysics

I will review the status of the space-based Laser Interferometer Space Antenna (LISA) and its science goals. LISA will detect gravitational waves in the frequency range 1e-4 Hz< f< 1Hz, a region of the spectrum populated by a large variety of astrophysical sources. Among these, a major role will be played by the mergers of massive black holes, which
LISA will detect up to very large redshift z∼10−20. I will focus on the physics of these sources, as well as on how their detection by LISA will shape our understanding of astrophysics, cosmology and fundamental physics.
   
12:00 to 13:00 - Discussion: Science from multi-band GW observations
 
14:30 to 15:10 Emanuele Berti (Johns Hopkins University, Baltimore, USA) Modified theories of gravity and exotic compact objects: An overview

Future gravitational wave detectors on Earth and in space will allow us to better understand general relativity in the strong-field regime. Their increased sensitivity can either lead to the discovery of new physics, or place tighter constraints on modified theories of gravity. I will discuss recent progress in our understanding of theory-agnostic and theory-specific tests of general relativity with next-generation gravitational wave observations of compact binary mergers.
   
15:10 to 15:30 Tanja Hinderer (Utrecht University, Utrecht, Netherlands) Probing modified gravity using GWs
   
15:30 to 15:50 Paolo Pani (Sapienza University of Rome, Rome, Italy) Probing compact objects using GWs
   
15:50 to 16:10 Swetha Bhagwat (University of Birmingham, Birmingham, UK) Constraining modified gravity and exotic compact objects using ringdown signal
 
16:30 to 17:30 Sayan Kar (IIT Kharagpur), N. V. Krishnendu (Birmingham) Discussion: Challenges and opportunities probing gravity using GW observations
 
Tuesday, 28 October 2025
Time Speaker Title Resources
09:30 to 10:10 Harald Pfeiffer (Albert Einstein Institute, Potsdam, Germany) Modelling astrophysical sources of GWs
 
10:10 to 10:30 David Trestini (University of Southampton, Southampton, UK) Post-Newtonian and self force calculations

I will review the state of the art in post-Newtonian and self-force theory and present the next steps and challenges in the field.
   
10:30 to 10:50 Riccardo Sturani (Instituto de Físíca Teórica (IFT-UNESP) / ICTP South American Institute for Fundamental Research, São Paulo, Brazil) Effective field theory and scattering amplitudes
   
10:50 to 11:10 Kenta Kuichi (Albert Einstein Institute, Potsdam, Germany) Numerical relativity
 
11:10 to 11:30 Frank Ohme (Albert Einstein Institute, Hannover, Germany) Issues in GW detection & inference
   
12:00 to 13:00 Alok Laddha (CMI), Marta Colleoni (Balearic Islands), MVS Saketh (ICTS) Discussion: Challenges and opportunities in GW source modelling
 
14:30 to 15:10 M. Coleman Miller (University of Maryland, Maryland, USA) Big questions in astrophysics

The emergence of gravitational-wave astrophysics over the last decade has opened new realms of discovery in physics and astrophysics. These include the nature of strong gravity, the properties of cold and possibly hot high-density matter, core-collapse supernovae and the production of compact objects, various possibilities for dark matter, and as always the lure of unknown and unexpected sources. I will present a personal view of many of the big questions in astrophysics that can be addressed using gravitational waves in the ~Hz-kHz frequency range (thus including ground-based detectors and possible lunar detectors), as well as some speculation about low-probability but high-impact discoveries that we might make.
   
15:10 to 15:30 Sourav Chatterjee (TIFR, Mumbai, India) Modelling of compact binary populations: Status & Challenges
 
15:30 to 15:50 Aditya Vijaykumar (CITA, Toronto, Canada) Prospects of inferring compact binary populations using GW observations
   
15:50 to 16:10 Varun Bhalerao (IIT Bombay, India) Prospects of multi-messenger astrophysics
   
16:30 to 17:30 Otto Hannuksela (CUHK), Kuntal Misra (ARIES, online), L. Resmi (IIST) Discussion: Challenges and opportunities in GW/Multi-messenger astrophysics
 
Wednesday, 29 October 2025
Time Speaker Title Resources
09:30 to 10:10 Tirthankar Roy Chowdhary (NCRA, Pune, India) Big questions in cosmology
 
10:10 to 10:30 Archisman Ghosh (Ghent University, Ghent, Belgium) Prospects of GW standard siren cosmology

Compact binaries observed in gravitational waves (GWs) are standard distance indicators or standard sirens. With complementary redshift information, they open up a parallel avenue to independently measure cosmological parameters such as the Hubble constant. The redshift can come from different ways respectively for "bright," "spectral," and "dark" standard sirens. In this talk we give a brief overview and describe the latest results from the LIGO-Virgo-KAGRA detector network. We then move over to some future prospects. We hope to convince the audience that only by including alternative electromagnetic tracers (such as galaxy clusters and luminous red galaxies) can we build the required redshift support to complement the GW distance information, towards precision GW cosmography.

Events between 05 Dec 2025 to 13 Dec 2025

24 Jan 2016 : 05 Dec 2025 : 13 Dec 2025 : 05 Feb 2016
   
10:30 to 10:50 Suvodip Mukherjee (TIFR, Mumbai, India) Probing structure formation using GWs
 
10:50 to 11:10 Teruaki Suyama (University of Tokyo, Japan) Probing primordial black holes using GWs
 
11:10 to 11:30 L. Sriramkumar (IIT Madras, India) Early universe cosmology using GWs
   
12:00 to 13:00 Susmita Adhikari (IISER Pune), Souvik Jana (CU Hong Kong) Discussion: Future of GW cosmology
 
14:30 to 15:00 Basudeb Dasgupta (TIFR, Mumbai, India) Dark matter: What we know and what we don’t
 
15:00 to 15:30 Sukanta Bose (Washington State University, Pullman, USA) Dense nuclear matter: What we know and what we don’t
 
15:30 to 15:50 Andrew L. Miller (Nikhef, Amsterdam, Netherlands) Prospects of dark matter probes using GW observations

Dark matter makes up roughly 80% of all matter in the universe, yet it remains completely invisible. Despite decades of dedicated experiments and a wide range of theoretical models, no direct evidence for physics beyond the Standard Model has emerged. This motivates exploring new approaches to dark matter detection — in particular, through gravitational waves. In this talk, I will present recent searches that use gravitational-wave interferometers to probe ultralight particle dark matter, and compare their results to those from traditional dark matter experiments. I will also discuss prospects for space-based gravitational-wave observatories to explore complementary mass ranges, illustrating how different detectors can together probe dark matter masses from [1e-24,1e-11] eV. Although gravitational-wave detectors are not designed to search for dark matter, they can simultaneously test multiple dark-matter models without compromising sensitivity to astrophysical sources, often placing competitive — and sometimes stronger — constraints than purpose-built dark-matter experiments.

Events between 05 Dec 2025 to 13 Dec 2025

24 Jan 2016 : 05 Dec 2025 : 13 Dec 2025 : 05 Feb 2016
   
16:30 to 17:30 Arunava Mukherjee (SINP), Rahul Kashyap (IIT Bombay) Discussion: GW observations as a probe of nuclear and particle physics
 
Thursday, 30 October 2025
Time Speaker Title Resources
09:30 to 10:10 Jan Harms (GSSI, L'Aquila, Italy) GW Detectors: Science & Technology of GW Detectors
   
10:10 to 10:30 Matt Evans (Massachusetts Institute of Technology, Cambridge, USA) Next-generation ground-based GW detectors

With almost 300 gravitational-wave sources detected to-date, and the first-generation facilities now over 20-years old, there is growing momentum towards the next-generation of gravitational-wave observatories. Projects are underway in Europe, Australia, Japan, India and the US to bring new ground-based observatories online. These audio-band observatories will be complemented by a wide range of efforts targeting other gravitational-wave frequency-bands. In this talk, I will focus on the US effort to build a next-generation observatory, known as Cosmic Explorer. Given the observational focus of the other talks, I will highlight the unique features of Cosmic Explorer, and aspects of the detector which are behind its compelling science case.
10:30 to 10:50 Robert Ward (Australian National University, Canberra, Australia) Quantum technologies for GW detectors
 
10:50 to 11:10 Tejaswi Venumadhav (Kavli Institute for Theoretical Physics (UCSB), Santa Barbara, USA) Data analysis challenges for next-gen detectors
 
11:10 to 11:30 Stephen R. Green (University of Nottingham, UK) AI/ML for GW data analysis
   
12:00 to 13:00 Ajit Mehta (CMI), Anand Sengupta (IIT Gandhinagar), Alvin Chua (NUS) Discussion: Challenges in future GW observations
 
14:30 to 16:00 Bruce Allen (Albert Einstein Institute, Hannover, Germany) Gravitational wave stochastic backgrounds and pulsar timing arrays

It seems likely that our universe contains a stochastic background of gravitational waves (GW), in some ways similar to the electromagnetic cosmic background radiation. In some frequency bands, this background is probably dominated by GW emission from "astrophysical" sources such as unresolved compact binary stars. In other frequency bands, this GW background may be dominated by cosmological processes.  I discuss the general properties of this GW background, and prospects for its detection and characterization at different frequencies.  I also review recent progress in the nano-Hz frequency band, using galactic-scale detectors called pulsar timing arrays. These have much in common with ground- and space-based detectors like LIGO and LISA, but also have some unique features.

Events between 05 Dec 2025 to 13 Dec 2025

24 Jan 2016 : 05 Dec 2025 : 13 Dec 2025 : 05 Feb 2016
 
16:30 to 17:30 - Poster session
Friday, 31 October 2025
Time Speaker Title Resources
09:30 to 10:10 Sendhil Raja (RRCAT, Indore, India) LGO-India: Status and plans
 
10:10 to 11:40 Steve Fairhurst (LSC/Cardiff, online), Brian O’Reilly (LIGO), R. Srianand (IUCAA), Subroto Mukherjee (IPR) Panel Discussion on LIGO-India