A power cut will shut down all EAS services on Tuesday, 10 January 2017 starting at 7:30 CET.
Block 1:
Recent results and status updates from PTAs, LISA, Rubin, and SDSS-V collaborations and upcoming datasets (including recent successes, anticipated science cases, timelines, synergies)
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Symposia S4
02-03 Jul 2026
Preparing for multi-messenger observations with LISA & PTAs
This Symposium is about multi-messenger synergies among the Laser Interferometer Space Antenna (LISA), Pulsar Timing Arrays (PTAs), and current and future EM and GW facilities. The LISA gravitational wave mission, an L3-class mission of the European Space Agency adopted in 2024, is currently scheduled to launch in 2035. Thanks to its ability to probe physics in the millihertz regime and sensitivity that can reach up to very high redshifts, LISA will open a new observational window to the Universe across distance scales: tens of thousands of the Galactic ultracompact binaries, and the diverse stellar interactions physics they constrain; stellar mass black hole binaries; the assembly and growth of super-massive black holes, including their seeding in the high-redshift universe and use as cosmological standard sirens; and strongly constraining millions of orbital cycles for strong-field general relativistic dynamics in extreme mass ratio inspiral events, tidal disruption events and quasiperiodic X-ray eruptions. At much lower frequencies, PTAs will undergo a revolution with the expansion and growing constraining power of current arrays and the upcoming Square Kilometre Array (SKA), which is opening a new nanoHz window into the dynamical universe. PTAs can constrain the cosmological stochastic gravitational wave background, theories of inflation, the existence of cosmic strings, dark matter models and the low-redshift population of supermassive black hole binaries. With the expected nanoHz-band detection of the first massive black hole binary by PTAs in the next five to ten years, this revolution will unfold alongside LISA in the 2030s. LISA and PTAs will complement each other by observing different frequency bands. Apart from their own science cases, together, they promise to resolve the long-standing mystery of the assembly and growth of massive black hole binaries in the centres of galaxies, as well as their co-evolution. These developments will be happening at the same time as other major observatories, including Gaia, Rubin, the Fifth Sloan Digital Sky Survey (SDSS-V), Roman, Athena, Extremely Large Telescope (ELT), Advanced X-ray Imagine Satellite (AXIS), Lunar Gravitational Wave Antenna (LGWA), Einstein Telescope (ET), and Cosmic Explorer (CE), are transforming or are expected to transform our understanding of Galactic, extragalactic, and stellar astronomy and cosmology. How can we make the best use of LISA and PTAs for European and global astronomy? Firstly, by preparing for the upcoming observations through improved modelling of waveforms and parameter estimation techniques for the different classes of sources, as well as for their expected observational counterparts, and by making the best possible predictions using data from current electromagnetic, neutrino, and gravitational wave observations in conjunction with astrophysical models of such different classes of sources. Secondly, we need to identify multimessenger opportunities with the diverse set of other facilities that will be possible in the 2030s. Thirdly, we need to identify the best strategies and actionable, practical pathways of enabling these synergies. Finally, recognising that highly sensitive new instruments often uncover previously unknown or unexpected sources, we need to ensure readiness for such unanticipated detections. We believe that EAS is uniquely capable, as a platform, of developing cross-disciplinary interactions with other communities, from galaxy formation and evolution to compact object astrophysics, from time-domain surveys to radio/optical/infrared/ultraviolet/X-ray facilities, that can broaden LISA and PTAs scientific impact. We welcome the broad and diverse European astronomical community to contribute to the Symposium by sharing insights and expertise to enable the prolific, transformative multi-messenger future that LISA and PTAs promise. Detailed Programme:Day 1:Block 2 (lunch block):What do JWST discoveries about the high-redshift Universe imply for LISA and SMBH growth histories (including observations and modelling of massive black hole seeds and assembly, stochastic GW background, cosmology, …) Block 3:Understanding the history of SMBH growth through LISA, PTAs, LSST, and SDSS-V observations and modelling: current status and future expectations (including observations and modelling of massive black hole binaries, accretion versus mergers, predictions from simulations and comparison to observations, SMBH binary discovery, dual AGNs, the challenge of big data volume, distinguishing signals from quasar noise, data analysis challenges, …) Block 4:Effects of environment on the evolution and observations of stellar binaries and SMBH binaries and EMRIs/IMRIs (including gaseous environments, circumbinary/accretion disks, eccentric sources, dark matter and other particles or fields, effects of environments on binary stellar interactions, triple companions, waveform modelling, populations, corresponding EM signatures, data processing challenges, missing physics from numerical simulations, tidal disruption events, quasi-periodic eruptions, …) Day 2:Block 5:Galactic Science with LISA and LSST (including observations and modelling of detached and mass transferring stellar mass sources, including white dwarf binaries, white dwarf-neutron star/black hole binaries, neutron star and black hole binaries, hot subdwarf binaries, pulsar binaries, in the Galaxy, Galactic center, Magellanic clouds and the Local group, data analysis challenges, …) Block 6 (lunch block):Our present and future ability to characterise SMBHBs and stellar binaries (including prospects for detection of individual sources, expected timeline, inferred parameters, time derivatives, localization accuracy) Block 7:Multi-messenger synergies today and in the near future: PTAs, LSST, Gaia, SDSS V, HST, JWST, Euclid, LIGO/Virgo/KAGRA (including discoveries, preparation and coordination for follow-up observations, targeted GW/EM searches of EM/GW candidates, galaxy catalogues for multi-messenger observations, LISA verification sources, best ways to prepare for LISA, standard sirens, modelling and interpretation of the various backgrounds, possible synergies in PTA, LISA, SKA, LSST data analysis) Block 8:Multi-messenger synergies in 2030s and 2040s: LISA, SKA, Roman, Athena, ELTs, ET/CE, LGWA, AXIS (including multiband GW observations, multimessenger observations of LISA sources, gravitational and electromagnetic counterparts for binary stellar/massive black hole/AGN/… populations, standard sirens, major data analysis challenges including the global fit, modelling and interpretation of the various backgrounds) Programme
Invited speakers TBA Scientific organisers
Contact alexey.bobrick @ monash.edu, mariacharisi1 @ gmail.com Updated on Sun Jan 25 18:33:15 CET 2026
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European Astronomical Society 
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