The Science Organizing Committee (SOC) has invited four speakers to present their Rubin research.

• Sean MacBride will present on "Gravitational Wave Cosmology with the Rubin Observatory LSST."

Gravitational waves offer a calibration-free probe of cosmological parameters, enabling direct measurement of luminosity distance without reliance on the traditional cosmic distance ladder or its other systematic uncertainties. Realizing the full potential of gravitational wave cosmology requires a synergistic partnership with deep, wide-field optical surveys. Operating as an unprecedented transient discovery machine, Vera C. Rubin Observatory is primed to rapidly identify and characterize optical counterparts to compact binary mergers, capturing the next bright siren events to place immediate, tight constraints on the expansion history of the universe. Beyond transient follow-up, the LSST will be transformative for dark siren analyses—events where no electromagnetic counterpart is detected.  Rubin's wide-area survey footprint, high completeness, and exceptional photometric precision will deliver galaxy catalogs capable of statistical cross-correlation at cutting-edge precision. In this presentation, I will present the state-of-the-art measurements in gravitational wave cosmology, and demonstrate the discovery potential of Rubin Observatory for future analyses.

• Burcin Mutlu-Pakdil will present on "Rubin at the Faint Frontier: Faintest Galaxies Across All Environments"

Faint dwarf galaxies are exceptional laboratories for investigating the nature of dark matter and the physics of galaxy formation at the smallest scales. Yet two major challenges continue to limit their cosmological power: the known population of the faintest galaxies beyond the Local Group remains small, and the unusual environment of the Local Group makes it difficult to determine whether conclusions drawn from its satellites are broadly representative. Building a rigorous census of faint galaxies across all environments is therefore essential.  Rubin will transform this field by enabling searches for galaxies that are fainter and more distant than those accessible to previous surveys. In this talk, I will highlight recent advances in finding and characterizing the faintest galaxies beyond the Local Group and discuss how Rubin will uncover new populations across diverse environments, strengthening their use as probes of dark matter and galaxy formation.

• John Franklin Crenshaw will speak on "Mapping Cosmic Structure at Redshifts 3-5 with a Hundred Million Lyman-break Galaxies"

LSST will open an unprecedented window onto the high-redshift Universe. Its unique combination of depth, sky coverage, and multi-band imaging will enable the discovery of hundreds of millions of galaxies at redshifts (2.5 < z < 5.5) using the Lyman-break “dropout” technique, in which ultraviolet light from distant galaxies is absorbed by neutral hydrogen in the intergalactic medium. Together, these galaxies will provide the largest map ever constructed of cosmic structure during an era when the Universe was only about 1–2 billion years old. I will discuss how the clustering of these galaxies and their cross-correlation with CMB lensing can probe the growth of structure and constrain cosmology at high redshift. I will present forecasts for the cosmological constraints expected from LSST, explore the impact of photometric redshift uncertainties, describe strategies for calibrating those redshifts, and highlight the key challenges that must be overcome to realize the full cosmological potential of this remarkable dataset.

• Carrie Holt will speak on the question of "What drives cometary activity in the outer solar system?"

Long-period comets contain ices relatively unprocessed since the solar system's formation, making their activity at large heliocentric distances a direct probe of primordial volatiles. Modern sky surveys now detect comets active beyond 5 to 10 au from the Sun, distances that LSST is expected to push even further, but the mechanisms driving this distant activity remain poorly understood, since temperatures are too low for water-ice sublimation, the usual driver closer to the Sun. I will present brightening trends of distant long-period comets beyond the water–ice sublimation region and empirical models that capture their activity across large heliocentric distance ranges. I will discuss how LSST stands to transform this picture by testing these models against a much larger population of distant comets observed further from the Sun than ever before and by sharpening target selection for the ESA’s Comet Interceptor mission.