With the 3rd generation camera on the South Pole Telescope, SPT-3G, over 10K square degrees of the southern sky has been surveyed in Stokes I/Q/U at frequencies of 90,150, and 220 GHz with noise levels in coadded intensity ranging from 2 to 9 $\mu$K-arcmin at roughly arcminute resolution. This provides insights over the full range in cosmic time, from the early universe to nearby objects....
The sixth public data release (DR6) of the Atacama Cosmology Telescope includes observations in total intensity and linear polarization taken between 2017 and 2022 in three frequency bands—98, 150 and 220 GHz—covering 19,000 square degrees. With white noise levels three times lower than those of Planck, the arcminute-resolution observations provide strong constraints on the physics governing...
Cosmic Microwave Background (CMB) measurements and other observations, combined with relatively basic theory, allow us to extrapolate back to when our Universe had a temperature $>10^{12}$ Kelvin, and to infer the very particular set of conditions which pertained at that time - almost uniform plasma with adiabatic, Gaussian, scale-free perturbations. The leading hypothesis for how those...
We present measurements of large-scale cosmic microwave background (CMB) E-mode polarization from the Cosmology Large Angular Scale Surveyor (CLASS) 90 GHz data. Using 115 det-yr of observations collected through 2024 with a variable-delay polarization modulator, we achieved a polarization sensitivity of $78\,\mathrm{\mu K\,arcmin}$, comparable to Planck at similar frequencies. We demonstrate...
The Simons Observatory (SO) is a cosmic microwave background (CMB) experiment situated on the Chajnantor Plateau in Chile's Atacama Desert. The observatory comprises seven mm-wave telescopes operating across six frequency bands (30-280 GHz). Six 60cm Small Aperture Telescopes (SATs) focus on detecting primordial B-mode polarization signatures of cosmic inflation in two deep,...
SPIDER is a powerful balloon-borne instrument designed to map the polarization of the millimeter-wave sky from above the bulk of the Earth’s obscuring atmosphere. SPIDER leverages the pristine observing conditions and long flight time provided by the NASA Long-Duration Balloon (LDB) platform to produce deep maps over a large area (~10% of the sky) and broad frequency range (95, 150, 280 GHz)....
The accuracy of the interpretation of the current generation of late-time cosmology probes is greatly limited by the theorists' ability to predict the response of baryons. This will only get more difficult in the coming years with the upcoming surveys (DESI-BGS, Euclid, LSST, 4-most, Simons) mapping our sky with unprecedented precision.
In this talk, I will discuss some of the efforts towards...
Exascale computing is driving a new era of cosmological simulations, enabling unprecedented precision in modeling large-scale structure formation and its interplay with the CMB. One example is the Frontier Exascale Simulation, which evolves 4 trillion particles within a 4.6 Gpc box, capturing the detailed growth of structure across cosmic time. These simulations provide high-fidelity...
Galaxy clusters, representing the peaks in the cosmic density field, serve as an independent and powerful tool for investigating the evolution of cosmic structures. The strategic identification of these clusters through multi-wavelength surveys is essential for advancing our understanding of gravitational theory, general relativity, and cosmological models. A significant milestone was achieved...
The large-scale structure of the universe can be probed by different observables. Galaxy clustering, weak gravitational lensing, galaxy cluster abundances, and cluster clustering are each sensitive to different aspects of cosmic structure formation and are affected by different astrophysical and observational uncertainties. Consistency of different observables presents a strong test of our...
The Euclid mission is designed to map the geometry and growth of structure in the Universe with unprecedented precision. As part of this effort, galaxy clusters serve as a crucial probe for constraining cosmological parameters, thanks to their sensitivity to both the expansion history and the growth of cosmic structures.
In preparation for the exploitation of Euclid’s cluster samples,...
As we enter a golden age of data-driven cosmology, multi-wavelength surveys are set to revolutionize our understanding of the universe. Ongoing and upcoming observations - ranging from Sunyaev-Zel'dovich (SZ) effects to X-ray emissions, fast radio bursts (FRBs), and absorption line studies — promise unprecedented insights into the astrophysical processes driving galaxy formation and evolution,...
The Three Hundred Simulation Suites include 324 re-simulated regions identified around massive clusters and resimulated with different hydrodynamical codes and resolution. Their purpose is to provide a large catalogue of theoretically modelled galaxy clusters for cosmological and astrophysical applications. Extensive work has been done to create mocks images to compare with observations and...
