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Ingunn Kathrine Wehus (University of Oslo)07/09/2026, 10:00
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Duncan Watts07/09/2026, 10:25
In this talk, I will give an overview of the Cosmoglobe DR2 analysis, in particular the application of global end-to-end processing to COBE/DIRBE data. As an absolutely calibrated instrument, DIRBE is uniquely sensitive to the cosmic infrared background monopole from 1 micron to 240 microns. I will give an overview of the improved time-ordered data processing that results in maps with...
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Angela Bonato (University of Oslo)07/09/2026, 10:45
I will present an improved zodiacal light (ZL) model for COBE-DIRBE derived through global Bayesian analysis within the Cosmoglobe Data Release 2 framework. The parametric form of the ZL model is inspired by the original DIRBE model by Kelsall et al. (K98), but the specific best-fit parameter values are re-derived using the combination of DIRBE Calibrated Individual Observations, Planck HFI...
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Erik Rosenberg (University of Manchester)07/09/2026, 11:30
The Simons Observatory (SO) is a cosmic microwave background survey experiment located in the Atacama Desert in Chile. SO consists of multiple small-aperture telescopes (SATs) carrying out a focused small-area survey, as well as a large-aperture telescope (LAT) conducting a wide-field, high-resolution survey. The SATs are specifically designed to target primordial B-mode polarization sourced...
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Reijo Keskitalo (University of Oslo)07/09/2026, 11:55
Planck survey may have completed in 2013 but the data analysis continues. I will give an overview of a recent analysis of the 857GHz channel making use of the slight residual polarization sensitivity of the nominally unpolarized spiderweb bolometers.
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Simone Paradiso (INAF-OAS)07/09/2026, 12:20
Cosmic birefringence ($\text{CB}$)—the in-vacuum rotation of the linear polarization plane of photons—presents a compelling hint of parity-violating physics beyond the Standard Model. Recent analyses have brought this effect to the forefront of $\text{CMB}$ cosmology: Planck PR4 data yielded an estimate of $\beta = 0.3^\circ \pm 0.05^\circ \text{ (stat)} \pm 0.28^\circ \text{ (sys)}$, while...
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Gina Panopoulou (Chalmers University of Technology)07/09/2026, 12:45
The alignment of dust grains with the Galactic magnetic field gives rise to polarized dust emission and polarization of starlight in the optical/NIR. This results in a tight correlation between the polarization angles of distant stars and that of dust emission. I will give an overview of recent works that use stellar polarimetry and stellar distances to inform foreground modeling, including...
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Danielle Sponseller (Chalmers University of Technology)07/09/2026, 14:30
One of the greatest challenges faced by CMB experiments is the detailed modeling and subtraction of Galactic foregrounds. Observations across multiple frequencies are necessary to constrain the synchrotron SED as well as to disentangle it from other foregrounds such as free-free emission. CHIPASS, a continuum reprocessing of the HI Parkes All Sky Survey (HIPASS) with an angular resolution of...
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Gabriel Hoerning (University of Manchester)07/09/2026, 14:45
I will begin by introducing the C-BASS survey and its role as a key low-frequency radio dataset for Galactic foreground studies, before presenting a new all-sky model of low-frequency diffuse Galactic emission describing the regime where synchrotron, free-free, and spinning dust emission dominate. The model extends the Planck 2015 diffuse component-separation by incorporating more recent radio...
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Mohammad Ishaque Khan (Instituto de Fisica de Cantabria (IFCA, CSIC-UC))07/09/2026, 15:10
Primordial gravitational waves from inflation imprint a faint B-mode polarisation in the Cosmic Microwave Background (CMB), but this signal is strongly obscured by Galactic foregrounds. Detecting CMB B-modes therefore requires accurate characterisation of foreground polarisation, dominated by synchrotron emission at low frequencies. To address this, we apply the Generalised Needlet Internal...
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Joshua MacEachern (National Research Council of Canada, Dominion Radio Astrophysical Observatory)07/09/2026, 15:35
Gravitational waves from inflation may have left a detectable signature in the parity-odd, “B-mode” component of the polarization of the Cosmic Microwave Background (CMB). Detecting B-modes in the CMB would be “smoking gun” evidence for inflation and would probe some of the highest-energy physics in the known universe. However, current experiments have placed stringent upper limits on B-modes....
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Gabriel Silva Costa (National Institute for Space Research (INPE))07/09/2026, 16:30
Cosmology is currently experiencing a data-rich era, with even more data expected in the coming decade. Intensity mapping of 21 cm neutral hydrogen emission offers a promising avenue for mapping vast volumes of the Universe with high redshift resolution, aiding in the study of large-scale structure and cosmological parameter estimation. However, extracting cosmological information from these...
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Paolo Campetti (University of Ferrara)07/09/2026, 16:45
Modern CMB analyses face a statistical bottleneck: the data are high-dimensional, non-Gaussian, affected by complex systematics, and often have intractable likelihoods, while the end-to-end simulations needed for Monte Carlo validation or Simulation-Based Inference are prohibitively expensive. I will present a unified framework based on the Scattering Covariance: an interpretable,...
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Hans Kristian Eriksen (University of Oslo)08/09/2026, 10:05
I will give a historical overview of how the method of Gibbs sampling was developed and applied during (soon) almost three decades of continuous work by a large group of people.
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Nabila Aghanim (IAS)08/09/2026, 10:35
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Katrine Alice Glasscock (University of Oslo)08/09/2026, 11:30
AKARI’s Far-Infrared Surveyor (FIS) produced high-angular-resolution all-sky observations in four bands spanning 65-160 μm, offering a valuable view of thermal emission from interstellar dust, zodiacal light, and the cosmic infrared background. This talk provides an overview of the instrument, survey, and its place among infrared and microwave observations, emphasising synergies with current...
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Eirik Gjerløw (University of Oslo)08/09/2026, 11:45
In this talk, I will introduce the re-analysis of AKARI-FIS currently underway within the Cosmoglobe collaboration. I will discuss the potential of the AKARI observations to shed light on the Cosmoglobe sky model, in particular with regards to interstellar and zodiacal dust modelling as well as observations of the CIB. I will also showcase some of the AKARI time-ordered data, its...
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Avinash Anand (University of Rome "Tor Vergata")08/09/2026, 12:10
Low-frequency correlated noise is a critical systematic for next-generation CMB experiments targeting the primordial B-mode signal. 1/f noise residuals are known to contaminate large angular scales and bias the estimation of the tensor-to-scalar ratio if they are not mitigated properly. In this context, we present BrahMap, a scalable and modular map-making framework designed for large-scale...
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Leo Bianchi (University of Oslo)08/09/2026, 12:35
The most straightforward way to construct a map from a set of time-ordered data (TOD) is through a classic inverse-variance bin mapmaker. However, certain experiments such as AKARI and Planck HFI require to take into account non-local effects, such as the bolometer transfer function or detector cross-talks. In such case, inverting the mapmaking equation analytically is not feasible and a...
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Phil Bull (University of Manchester)08/09/2026, 14:20
The 21cm signal from neutral hydrogen traces cosmic large-scale structure in 3D over an exceptionally wide redshift range. It has proven difficult to disentangle from foreground contamination and instrumental effects however. I will explain how the large dynamic range between signal and foregrounds and stringent spectral calibration requirements make this a difficult data analysis problem. I...
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Jordan Norris (University of Manchester)08/09/2026, 14:45
The Remote HI eNvironment Observer (RHINO), currently under construction at Jodrell Bank Observatory, is an experiment aiming to observe between 60-85 MHz to measure the sky-averaged 21-cm absorption feature redshifted from the Cosmic Dawn. This signal is obscured by galactic synchrotron foregrounds that are brighter by over four orders of magnitude. Additionally, instrumental systematics...
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Rashi Srivastava (University of Manchester)08/09/2026, 15:00
Global 21 cm experiments measure the absolute sky temperature at low radio frequencies, offering a potential low-resolution reference for large-scale sky models. However, the measurement is strongly shaped by the antenna beam, whose imperfect calibration can mix spurious sky structure into the observed spectrum. I present simulations testing whether controlled antenna rotation can help...
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Ricardo T. Génova-Santos (Instituto de Astrofísica de Canarias)08/09/2026, 15:15
In this talk I will give an overview of the status and recent results of QUIJOTE, a CMB polarization experiment working in the frequency range 10-40 GHz from the Teide Observatory (Tenerife, Spain). The QUIJOTE MFI instrument produced maps covering the full northern hemisphere at 11, 13, 17 and 19 GHz that were publicly released in 2023. I will highlight the scientific results coming out of...
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Elena de la Hoz (NASA Goddard Space Flight Center)08/09/2026, 16:30
Anomalous Microwave Emission (AME) remains a critical uncertainty in global sky modeling, with its widely hypothesized origin tied to spinning Polycyclic Aromatic Hydrocarbons (PAHs). Robustly separating AME from other diffuse Galactic foregrounds requires using multi-frequency data across the electromagnetic spectrum. In this work, we present a blind component separation approach using...
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Fazlu Rahman Panam Parambil (Texas A&M University)08/09/2026, 16:55
Small-scale non-Gaussianity in Galactic foregrounds is an important source of uncertainty for future CMB experiments. We investigate the statistical properties of diffuse Galactic foregrounds using Minkowski Functionals and generalized skewness–kurtosis statistics across a range of angular scales. We find a remarkably similar kurtosis-type non-Gaussian signature in synchrotron, free-free,...
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Raelyn Sullivan (University of Oslo)09/09/2026, 10:05
The Cosmoglobe collaboration has recently completed the second data release, the reanalysis of the COBE-DIRBE data, producing new starlight emission models, zodiacal light models, cosmic infrared background (CIB) detections and new Milky Way dust models. In this talk, I will focus on the new dust models. This new dust model simplifies previously used dust models, and improves the...
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Jyothis Chandran (Instituto de Fisica de Cantabria (IFCA, CSIC-UC))09/09/2026, 10:20
The thermal Sunyaev-Zeldovich effect Compton-y parameter map (y-map) is a redshift-independent tracer of the hot baryon density across the sky. The all-sky y-maps reconstructed from Planck data have been utilized for the study of Lambda-CDM cosmology and the astrophysics of galaxy clusters. The current best minimum variance, all-sky y-map was made public in our previous work, using Needlet ILC...
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Srijita Sinha (NISER Bhubaneswar, RRI, Bangalore)09/09/2026, 10:45
Template-fit approach is often used to separate the Galactic dust emission and the cosmic infrared background (CIB) anisotropies at low HI column density regions with an underlying assumption that the gas and dust are tightly correlated. However, this method fails in regions where additional Galactic emission from the molecular hydrogen, diffuse ionized gas, and dark gas are present. We...
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Serena Giardiello (Cardiff University)09/09/2026, 11:45
LiteBIRD is an ISAS/JAXA strategic L-class mission to probe cosmic inflation and the cosmic history of the Universe through full-sky measurements of cosmic microwave background (CMB) polarization. Its design will allow an almost cosmic variance limited measurement of the E-mode power spectrum at large angular scales and a much tighter constraint on the optical depth of reionization $\tau$...
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Valentina Genesini (University of Ferrara)09/09/2026, 12:10
Reionisation marks the epoch when the first luminous structures ionised the intergalactic medium after recombination, producing free electrons that Thomson-scatter CMB photons. This imprint is encoded in the large-scale E-mode polarisation of the CMB, which directly constrains the optical depth τ. Despite the high quality of Planck and WMAP data, a fully consistent framework that jointly...
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Debabrata Adak (Institute of Astrophysics of the Canary Islands)09/09/2026, 12:25
Measurements of the Cosmic Microwave Background (CMB) temperature anisotropies over the past three decades have transformed our understanding of the Universe, while polarisation measurements have begun to provide additional powerful cosmological insights. Upcoming CMB experiments such as LiteBIRD, the Simons Observatory, and future missions including PICO will measure CMB polarisation with...
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Geoff Murphy (University of Western Cape)09/09/2026, 12:40
The MeerKLASS survey uses MeerKAT in single-dish autocorrelation mode to map the large-scale neutral-hydrogen sky over hundreds of square degrees, with the long-term goal of contributing a low-redshift, radio-frequency view of cosmic structure to the broader multi-wavelength sky-modelling effort. Reaching the required sensitivity demands gain calibration that is stable and absolute to a level...
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Magdy Morshed (INFN, Ferrara)09/09/2026, 14:30
The current and future observations of the CMB are expected to reach unprecedented sensitivity to place stringent constraints on both cosmological parameters and fundamental physics. The ground-based Simons Observatory Large Aperture Telescope started observations last year, and will provide the most sensitive small-scale CMB measurements. A tight control over instrumental systematics is...
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Alexandre Adler (UC Berkeley/LBNL)09/09/2026, 14:55
I will present work done with Magdy Morshed on a new, fast way of simulating the temperature to polarization leakage due to beam pointing errors and mismatched ellipticity in detector pairs at the map level, as well as how we validated it using the TOAST time-domain simulation pipeline. Those effects are important for instruments that aim to measure the small scales of the polarized CMB, like...
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Nicholas Kern (University of Michigan)09/09/2026, 15:20
Next-generation 21cm cosmology experiments promise to revolutionize our understanding of the high redshift universe; however, these experiments are overwhelmed by foregrounds many orders of magnitude brighter. This sets a precise specification on instrumental modeling requirements that have to date made direct detection of the 21cm at the EoR elusive. However, next-gen computing and inference...
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Nils-Ole Stutzer (University of Oslo)09/09/2026, 15:45
Modern cosmology has revealed many secrets of the nature and evolution of the Universe. To date, most surveys have done this by mapping the early Universe with the Cosmic Microwave Background (CMB) or relatively recent times by mapping the large-scale distribution of galaxies. However, epochs in between, from the dark ages through the epoch of reionization (EoR) all the way to the Epoch of...
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Kumar Aryan (Institute of Astrophysics of Canary Islands)09/09/2026, 16:30
Anomalous Microwave Emission (AME) is a poorly understood Galactic foreground that becomes increasingly relevant for the precision targeted by next-generation CMB experiments, particularly in polarisation where current observations only place sub-percent upper limits on its polarisation fraction. LiteBIRD, with its broad frequency coverage and high sensitivity, offers a unique opportunity to...
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Bruno Bizarria (INPE - Instituto Nacional de Pesquisas Espaciais)09/09/2026, 16:45
Observations from MeerKLASS exhibit significantly higher chromaticity than standard simulations, requiring approximately much more PCA modes for effective foreground removal than the 4–5 modes typically predicted. To address this discrepancy, we present a Bayesian framework designed to measure and characterize chromatic modulating effects on intensity maps. Our model represents instrumental...
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Yasuo Doi (The University of Tokyo)10/09/2026, 10:05
Ultralight axion-like particles (ALPs) generically induce cosmic birefringence through their coupling to photons, but existing measurements based on integrated polarization rotation are primarily sensitive to the overall amplitude of the effect and do not directly probe the spatial coherence of the underlying field. We show that wide-field measurements of galaxy polarization provide a direct...
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Dale Fixsen (University of Maryland/Goddard Space Flight Center)10/09/2026, 10:20
High sensitivity is routinely prioritized in observational cosmology, yet the output of precision experiments is ultimately bound by instrument calibration. Too often treated as a late-stage detail, un-optimized calibration strategies—specifically instrumental offsets and gain drifts—directly limit measurement accuracy. Drawing on my experiences with COBE/FIRAS and ARCADE 2, I show how...
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Ana Isabel Silva Martins (University of Oslo)10/09/2026, 10:45
I will present the current results of the reanalysis of the COBE-FIRAS data, including a new temperature of the CMB monopole and constraints on spectral distortions.
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Yi-Kuan Chiang (ASIAA)10/09/2026, 11:30
CMB data are fundamentally projected, with intricate secondary anisotropies each revealing distinct chapters of cosmic evolution. In a series of 6 papers, we carry out a deeply data-intensive cross-correlation tomography of CMB secondaries, jointly analyzing billions of HEALPix pixels across dozens of diffuse sky maps (e.g., Planck, IRAS, Herschel) and spectroscopic galaxies tracing...
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Valentina Franco Velásquez (Universidad de Oviedo)10/09/2026, 11:55
The detection of the primordial B-mode polarization in the Cosmic Microwave Background (CMB) is one of the most compelling goals in modern cosmology, as it would provide strong evidence for an inflationary period. Achieving this requires accurate component separation techniques to disentangle the cosmological signal from astrophysical foregrounds and instrumental noise. In this work, we...
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Ananya Shankar (Max-Planck Institute for Astrophysics)10/09/2026, 12:10
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Rahul Shah (Indian Statistical Institute, Kolkata)10/09/2026, 12:35
Machine learning is increasingly shaping cosmological analyses, though its impact depends critically on careful validation and physically interpretable use. In this talk, I will outline several AI/ML approaches for model-independent cosmological inference, with an emphasis on how data-driven methods can complement more traditional statistical techniques. I will discuss...
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Xavier Coulon (IAS-CNRS)11/09/2026, 10:05
The only precise measurement of the cosmic microwave background (CMB) spectrum to date was achieved by COBE-FIRAS in the early 1990s, demonstrating that the CMB spectrum is extraordinarily close to a perfect blackbody emission. However, both standard and non-standard physical processes are expected to generate small deviations from this spectrum, known as CMB spectral distortions. These...
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Jens Chluba (University of Manchester)11/09/2026, 10:30
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Kaustuv Basu (Bonn University)11/09/2026, 10:55
Convolutional Neural Networks (CNNs) are now widely deployed in astronomy, often claiming superior performance over classical linear estimators for an extensive range of data applications. Yet it remains unclear when a CNN can genuinely outperform the matched filter (MF) -- which attains the Cramér–Rao Lower Bound (CRLB) as the minimum-variance unbiased estimator (MVUE) under Gaussian noise,...
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Ken Ebisawa (ISAS/JAXA)11/09/2026, 11:40
MAXI (the All-Sky X-ray Imager) is an all-sky X-ray monitor that has been in operation on the International Space Station (ISS) since 2009. I will provide an overview of MAXI’s achievements over the past 17 years, including the discovery of 17 X-ray novae, and its current status.
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Po-Ya Wang (National Tsing Hua University)11/09/2026, 12:05
Fast X-ray Transients (FXTs) are brief, intense X-ray flashes unassociated with persistent X-ray sources or known stellar objects, typically lasting from seconds to hours. Previous studies have identified the origins of some FXTs, e.g., XRO 080109/SN2008D as supernova shock breakouts and EP240315a as longduration Gamma-Ray Bursts. In the past 4 decades, a portion of FXTs has been identified as...
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Jonas Lunde (University of Oslo)11/09/2026, 12:20
The Cosmoglobe collaboration has over the last decade developed and utilized the Commander3 Fortran codebase for global Bayesian CMB analysis. Commander4 is a ground-up rewrite of this algorithm with the necessary performance and scalability to analyze modern (>10TB) CMB datasets. While less mature than Commander3, it has now matured to the state of being able to perform preliminary analysis...
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Mathew Galloway (University of Oslo)11/09/2026, 12:45
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Ingunn Kathrine Wehus (University of Oslo)
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Jonas Lunde (University of Oslo)
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Hans Kristian Eriksen (University of Oslo)
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Hans Kristian Eriksen (University of Oslo)
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