Cosmic Rhythms

Session

Baryonic Physics & Feedback I

9 Sept 2026, 09:30

Auditório Ministro João Alberto Lins e Barros (CBPF)

94. Alexandra Amon: Impact of Baryons for WL

Alex Amon

09/09/2026, 09:30

10. Calibration of baryonic effects using joint modeling of weak lensing, Sunyaev-Zel'dovich effects and galaxies

Shivam Pandey (University of Arizona)

09/09/2026, 10:00

Oral Talk

Future weak lensing surveys are poised to deliver unprecedented cosmological constraints, but their statistical power on small scales is fundamentally limited by systematic uncertainties in baryonic feedback. This feedback alters the total matter power spectrum in a way that is degenerate with key cosmological parameters. We introduce a self-consistent halo model that leverages the kinetic...

54. Constraining baryonic physics in shear analyses using the kSZ power spectrum

Lea Harscouet (Oxford University)

09/09/2026, 10:15

Oral Talk

The traditional, real-space stacking estimator for the kinematic Sunyaev Zeldovich (kSZ) effect can be expressed as a simple angular power spectrum of two quantities: the CMB temperature field, and the galaxy momentum field. This power spectrum approach is mathematically equivalent to the stacking estimator, and comes with a number of advantages: it is fast to compute, easily connected to...

59. Towards robust cross-correlations of LSS with X-ray observations

Jozef Bucko (ETH Zurich)

09/09/2026, 11:00

Oral Talk

Diffuse X-ray emission from hot intracluster gas and emission from active galactic nuclei (AGN) provide complementary tracers of large-scale structure, encoding rich information about baryonic feedback, black hole and galaxy formation, and cosmology. These observables are particularly promising for cross-correlation studies with upcoming wide-field X-ray surveys.

We present a...

21. Baryonified Lightcones: A Unified Framework for LSS–CMB Cross‑Correlation Cosmology

Michael Kovac (University of Manchester)

09/09/2026, 11:15

Oral Talk

Understanding the impact of baryonic feedback on the matter distribution is a major challenge for precision cosmology, especially for analyses combining large-scale structure tracers with CMB secondary anisotropies. We recently showed that combining kinematic Sunyaev–Zel’dovich measurements from ACT with gas‑fraction data from eROSITA provides strong constraints on gas thermodynamics in...

56. Toward a consensus picture of baryon feedback: Joint X-ray, Sunyaev-Zeldovich, and weak lensing measurements

Jared Siegel Siegel (Princeton University)

09/09/2026, 11:30

Oral Talk

There is no consensus on how baryon feedback shapes the underlying matter distribution from either simulations or observations. We confront the uncertain landscape by jointly analyzing the kinetic and thermal Sunyaev-Zel’dovich (kSZ) effects and X-ray gas mass fractions, each characterized with galaxy-galaxy lensing. Across group and clusters masses and between $0<z<1$, we find consistent...

29. A robust view of feedback in the TNG model

Francisco Germano Maion

09/09/2026, 11:45

Oral Talk

We present a new analysis of the IllustrisTNG galaxy formation model based on a set of simultaneous multi-zoom hydrodynamical simulations of halos embedded within a common cosmological volume. This framework allows us to efficiently probe galaxy populations across a wide range of masses and environments while maintaining full cosmological context. We compare predictions for the galaxy stellar...