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Ludovic Montier (IRAP)18/12/2024 10:00
I will present the status of the LiteBIRD JAXA mission, after it entered in reformation period since September 2025.
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Dr Mathieu Remazeilles (IFCA, CSIC-UC)18/12/2024 10:30
This talk will highlight the LiteBIRD space mission's capability to map the thermal Sunyaev-Zeldovich (SZ) effect, arising from the scattering of CMB photons by hot baryonic gas within and around galaxy clusters. Although primarily designed to search for large-scale CMB B-mode polarization, LiteBIRD will deliver full-sky maps in total intensity with unprecedented sensitivity across 15...
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Miguel GOMES (Institut d'Astrophysique de Paris)18/12/2024 10:50
Future satellite missions focusing on the tensor-to-scalar ratio r will likely include a rotating half-wave plate (HWP) device in order to precisely recover the B-mode polarization signal. Patanchon [2023] modeled the effect of HWP systematic imperfections leading to Intensity to Polarization (IP) leakage on the measurement of the B-mode signal. This model is now implemented in the LiteBIRD...
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Elisa Russier18/12/2024 11:10
PICO is a space mission concept submitted by NASA to the Astro2020 Decadal Review panel as a candidate Inflation Probe (IP) and such a probe was selected for implementation. In the original submission the team showed that with 5 years of observations PICO would be able to place more than 20 sigma constraint on r=0.003 and reject r=0.0005 with 5 sigma confidence. These tight constraints were...
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Anaïs Besnard (Institut d'Astrophysique Spatiale (IAS))18/12/2024 11:30
Not long after the Planck space mission launch, it appeared that signals from the detectors operated at 100 mK of one of its instruments, HFI, were affected by cosmic rays. The heat dissipation in the detectors due to these particles hits created spurious signals appearing as glitches in the data. Further post-launch studies have allowed for most of these glitches to be removed.
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Several space... -
Alexandre Adler (UC Berkeley/LBNL)18/12/2024 11:50
Taurus is a balloon-borne CMB experiment, planning to launch in 2027. It will fly from Wanaka, New Zealand, as the payload of a NASA Super Pressure Balloon in the stratosphere of the Southern Hemisphere, giving it a view of more than half of the sky. By imaging at night for several weeks with its three refractor telescopes, Taurus will map the polarized microwave emission of the sky in four...
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Valentin SAUVAGE18/12/2024 12:10
Experimental cosmology is always in needs of innovative more performant technology for longer and more sensitive observations. Cooling systems can be a limitation in term of the mission lifetime and temperature stability of the sub-K detection chains. A Closed-Cycle Dilution Refrigerator (CCDR), providing continuous cooling at ultra-low temperatures (100 mK) using helium isotopes 3He and 4He,...
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Jens Chluba (Jodrell Bank Center for Astrophysics at the UoM)18/12/2024 14:00
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Nabila Aghanim (Institut d'Astrophysique Spatiale)18/12/2024 14:25
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Ludovic Montier (IRAP)18/12/2024 14:50
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18/12/2024 15:00
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Louise MOUSSET (LPENS)18/12/2024 16:30
Next-generation CMB experiments have very stringent constraints to achieve the required sensitivity to target polarization B-modes. In this work, we intend to set constraints on out-of-band rejection level and derive requirements on the telescope filtering scheme. We follow a global approach, taking into account the impact on detector noise, on thermal balance and on thermal stability. This...
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Wuhyun sohn (APC / CNRS)18/12/2024 16:50
New heavy particles during inflation can leave imprints in the primordial perturbations and subsequently in the observed CMB anisotropies. This remarkable detection channel allows us to probe new physics at extremely high energies. I present our recent work on the first extensive search for cosmological collider signals with the CMB data. We utilise the publicly available CMB bispectrum...
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Stéphane ILIC (IJCLab)18/12/2024 17:10
The cosmic microwave background provides a crucial window into the early universe's evolution, offering insights into the epoch of reionization (EoR). In this talk, I will present new constraints on the reionization history derived from the final Planck data release (Public Data Release 4, PR4). Leveraging the enhanced sensitivity and reduced systematic uncertainties of the PR4 data, we...
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Omar Darwish (University of Geneva)18/12/2024 17:30
We will discuss non-Gaussian effects in CMB lensing maximum a posteriori methods (MAP) coming from the large-scale structure bispectrum and extragalactic foregrounds emission. We will show how MAP methods naturally mitigate biases that are relevant for standard CMB lensing estimators, both in auto and cross-correlation analyses. This will not be relevant only for CMB-S4, for which MAP methods...
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Louis Legrand (DAMTP, University of Cambridge)18/12/2024 17:50
Gravitational lensing of the Cosmic Microwave Background (CMB) will soon be reconstructed with unprecedented precision, driven by deep polarisation maps from upcoming experiments like SPT-3G, the Simons Observatory, and CMB-S4. Reconstructing and subtracting the lensed B modes of polarisation is crucial to uncover the primordial B modes from inflation. In this talk, I will introduce an optimal...
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Raphaël Kou (University of Sussex)18/12/2024 18:10
The discrepancy between local measurements of the Hubble constant and inferences from CMB and galaxy clustering data, known as the "Hubble tension", has motivated numerous models introducing additional components active before recombination. While many such models have been proposed, none are currently strongly favoured by data. This highlights the critical role of upcoming CMB experiments,...
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Adrien LA POSTA (Oxford University)19/12/2024 08:55
The Simons Observatory is an ensemble of telescopes being progressively deployed on Cerro Toco (Chile), aiming at measuring both small and large angular scales of the cosmic microwave background. Three Small Aperture Telescopes have been successfully installed on site and started operating from late 2023. These half-meter mirrors telescopes are designed to measure the large-scale polarization...
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Andrea Catalano (LPSC - Grenoble)19/12/2024 09:15
Over the past year, the proposal to build a high-frequency Small Aperture Telescope (SAT) to add to the Simons observatory has gradually become more and more consolidated. This project named Kairos is currently submitted for funding to the RI2 CNRS program (Recherche à risque et à impact) and has obtained the support of three institutes (IN2P3, INSU and INP). We propose to deploy a focal plane...
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Baptiste Jost (IPMU)19/12/2024 09:35
One of the main scientific goals of the Simons Observatory (SO) Small Aperture Telescopes (SATs) is to measure traces of inflation in the primordial B-modes in the CMB polarization. This signal is expected to be extremely faint. Its detection therefore depends on the removal of contaminating signals emitted by Galactic foregrounds and an exquisite control of systematic effects, such as the...
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Benjamin Beringue (APC, CNRS)19/12/2024 09:55
Rayleigh scattering of the Cosmic Microwave Background (CMB) is a less studied yet potentially powerful probe of the recombination history. Scattering of CMB photons off neutral species right after recombination presents a distinctive $\nu^4$ scaling with frequency as well as a strong correlation with the primary CMB. These unique features should facilitate its detection by the next generation...
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Simon Biquard (APC / CNRS)19/12/2024 10:15
The quest for primordial B-mode polarisation in the cosmic microwave background poses significant analysis challenges. Because the signal is so faint, robust measurements (or constraints) require a particular attention to systematic effects, astrophysical foregrounds, as well as the interplay between the two. This task is made even more difficult by the volume and complexity of the datasets...
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Magdy Morshed (INFN Ferrara)19/12/2024 11:10
Component separation is the crucial and challenging analysis step to estimate the CMB signal in the presence of astrophysical contaminants.
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The Galactic dust and synchrotron are the primary millimeter emissions to remove in the search for primordial CMB B-modes.
One major unknown is the full complexity of the polarized astrophysical foreground spectral properties, which is yet to be assessed... -
Dr Alessia Ritacco (CNRS-LPSC)19/12/2024 11:30
In the context of future experiments measuring the polarization of the Cosmic Microwave Background (CMB), COSMOCal proposes a method independent of laboratory calibration of CMB instruments and cosmological model assumptions to calibrate next-generation millimeter-wave telescopes. The primary objective is to achieve polarization angle calibration with a precision better than 0.1 degrees. This...
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Sofia SAVORGNANO (LPSC Grenoble)19/12/2024 11:50
The ambitious quest to detect the faint B-modes of CMB polarization, pursued by projects like the Simons Observatory (SO) and LiteBIRD, requires rigorous control over systematic effects in polarimetry. The PolarKID project, supported by CNES (2023–2025), is dedicated to testing LEKIDs in a filled array configuration to demonstrate their capability for precise polarization detection. This setup...
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Apolline CHAPPARD (Ias)19/12/2024 12:10
The QUIJOTE MFI instrument (2012-2018) observed the sky at four
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frequency bands, 11, 13, 17, and 19 GHz, at 1 degree angular resolution.
For ground-based Cosmic Microwave Background experiments like QUIJOTE,
the atmosphere is a major source of contamination in the data. Using the
entire database of MFI wide-survey observations (2013-2018), we
characterized the correlation properties of... -
Etienne Camphuis (Institut d'Astrophysique de Paris)19/12/2024 13:45
SPT-3G, the third-generation camera on the South Pole Telescope, observes cosmic microwave background (CMB) anisotropies with arcminute resolution and 4.5muKarcmin coadded noise in temperature. Recent analyses of polarization data from the 2019 and 2020 seasons have yielded the most precise reconstruction of the E-mode spectrum above ell = 2000 and the CMB lensing spectrum above L = 350. From...
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Aline VITRIER (IAP)19/12/2024 14:05
The South Pole Telescope (SPT) observes the CMB with its 10m primary mirror from the South Pole and its third generation camera SPT-3G started collecting data in 2018. The Wide field is one of the three regions observed by SPT-3G and extends the survey area to cover 25% of the sky in total. This field is divided in nine subfields spread in the south hemisphere around the galactic plane with a...
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Ali Rida Khalife (IAP-CNRS and Sorbonne University)19/12/2024 14:25
The detection of primordial tensor modes, i.e. gravitational waves, through primordial CMB B-modes is considered the smoking gun signal for inflation. However, in order to solidify this conclusion, we need to insure that other primordial mechanisms do not produce the same signal. To that end, primordial gravitational vector modes (V-modes) and their sourcing of primordial magnetic fields...
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Alice MOYER (LPSC (CNRS))19/12/2024 14:45
In Sunyaev-Zeldovich (SZ) cluster cosmology, accurately determining cluster masses is crucial for constraining cosmological parameters through cluster number counts.
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As the mass is not an observable, a scaling relation is needed to link cluster masses to the integrated Compton parameter Y, i.e., the SZ observable, to exploit data from large millimeter surveys. Current cosmological results use... -
Damien Cherouvrier (LPSC, Grenoble), Juan Francisco Macias-Perez (LPSC)19/12/2024 15:05
Clusters of galaxies, formed at the latest stages of structure formation, constitute unique cosmological probes and are sensitive to cosmological parameters related to structure formation like the rms of matter fluctuations. With the advent of large CMB surveys like those from the Planck satellite, the ACT and SPT telescopes, we now have access to large catalogs of galaxy clusters detected at...
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Nicholas Battaglia19/12/2024 15:55
I will introduce the CCAT collaboration which has built the Fred Young Submillimeter Telescope (FYST, pronounced feast). I’ll provide an overview of the first generation instruments being deployed on FYST and their science goals. I’ll conclude with a discussion of the state of the CCAT collaboration and our timelines.
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Adélie Gorce (IAS, Université Paris-Saclay)19/12/2024 16:15
The Epoch of Reionisation imprints its history and morphology on the Cosmic Microwave Background temperature and polarisation anisotropies through two effects: The kinetic Sunyaev Zel'dovich (kSZ) effect and Thomson scattering. I present an analytical approach to derive consistently the angular power spectra of the three main resulting imprints that are the spatial fluctuations of the Thomson...
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Elizabeth Mc Bride (Institut d'Astrophysique Spatiale), Adélie Gorce (IAS, Université Paris-Saclay)19/12/2024 16:35
Historically disregarded as a foreground contaminant, the kinetic Sunyaev-Zel'dovich (kSZ) effect has seen a surge of interest in recent years as an additional cosmological probe. Arising from interactions between CMB photons and free electrons in ionised bubbles, the kSZ signal contains information about the timeline and morphology of Reionisation, a critical, yet poorly understood, period...
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Jacques Delabrouille (IN2P3)19/12/2024 16:55
CMB-S4 is conceived by a broad community as the path forward to realizing the enormous potential of CMB measurements for understanding the origin and evolution of the Universe, from the highest energies at the dawn of time through the growth of structure to the present day. The most efficient strategy to reach these science goals is to combine two complementary sky surveys: an ultra-deep...
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Julien Tang19/12/2024 17:15
CMB-S4 will collect data in the form of continuous time-ordered data streams spanning years of observation time with hundreds of thousands of detectors, which must be combined into maps of sky emission, a process known as mapmaking.
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The baseline mapmaking pipeline for CMB-S4 relies on timestream filtering to reduce long-term drifts of various origins. This impacts the measurement of large...
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