GDR CoPhy Episode 4

Session

Tuesday Afternoon

2 juin 2026, 16:30

Clermont Ferrand

70. The Lazuli Space Telescope and its use for Cosmology

Mickael RIGAULT (CNRS/IP2I)

02/06/2026 16:30

Lazuli is a 3m-class space telescope founded and developed by the Schmidt Sciences as part of the Schmidt Observatory System, with a concept to launch timeline of approximately 3 years. The observatory is equipped with 3 instruments (a slicer integral field spectrograph, a multi-band camera array, and a coronagraph) and is designed to allow rapid response (<4 hours) for transients alerts'...

52. No supernovae? Measuring H₀ from Cepheids, TRGB stars, and masers with BORG peculiar velocities

Richard Stiskalek (Oxford University)

02/06/2026 17:00

The Hubble tension demands fresh, independent routes to H₀. I present two-rung and one-rung distance ladders that bypass Type Ia supernovae entirely, connecting Cepheid and TRGB distances, as well as geometric maser distances, directly to cosmological redshifts. The first two-rung ladder uses the SH0ES Cepheid sample with Milky Way, LMC, and NGC 4258 anchors, yielding H₀ = 71.7 ± 1.3 km/s/Mpc...

57. Future missions for CMB spectral distortion measurements

Xavier Coulon (IAS-CNRS)

02/06/2026 17:30

The only precise measurement of the cosmic microwave background (CMB) spectrum to date was achieved by COBE-FIRAS in the early 1990s, showing that it is close to a perfect blackbody emission. However, both standard and non-standard physical processes inevitably generate small deviations from this spectrum, known as CMB spectral distortions. They provide a powerful and unexplored probe of the...

39. WG TOOLS

Guilhem LAVAUX (IAP, CNRS INSU)

02/06/2026 18:00