Colloque national CMB-France #2

Session

Contributions

15 nov. 2021, 10:00

14. Prédictions de performances de l'analyse combinée Euclid et CMB

Dr Stéphane Ilic (Observatoire de Paris - LERMA)

15/11/2021 10:00

Grâce aux mesures de lentillage gravitationnel et de clustering des galaxies, Euclid posera des contraintes sans précédent sur l'Univers récent. D'autre part, des observations CMB de haute qualité (Planck et futures expériences) sont capables d'imposer des contraintes strictes sur l'Univers primordial. La combinaison de ces deux sources d'informations cosmologiques peut constituer un bras de...

8. Cosmological constraint with new Planck tSZ map

Hideki Tanimura (Institut d'Astrophysique Spatiale)

15/11/2021 10:20

The thermal Sunyaev-Zeldovich (tSZ) effect is produced by the inverse Compton scattering of cosmic microwave background (CMB) photons by hot electrons, particularly in galaxies clusters. It has been used as a powerful tool to constrain the cosmological parameters given its particular sensitivity to sigma8 and omega_m.

I produced a new all-sky tSZ map constructed from the latest Planck PR4...

11. Cosmology with the kinetic Sunyaev-Zeldovich effect: Independent of the optical depth and sigma 8

Joseph Kuruvilla (IAS)

15/11/2021 10:40

The cosmological constraints from the kinetic Sunyaev-Zeldovich experiments are degenerate with the optical depth measurement, which is commonly known as the optical-depth degeneracy. In this talk, we introduce a new statistic based on the first moment of relative velocity between pairs in a triplet, which is capable of constraining cosmological parameters independent of the optical depth, and...

24. The Simons Observatory and a new framework for constraining cosmic birefringence in the presence of systematics and galactic foregrounds

Baptiste Jost

15/11/2021 11:00

The Simons Observatory (SO) is a new generation CMB experiment. It is currently under construction in the Atacama desert in Chile and its first light is planned in 2022. It gathers 60,000$TES detectors on two types of telescopes: 3 Small Aperture Telescopes (SATs) and one Large Aperture Telescope (LAT). This hybrid observatory was shown to be the most efficient approach to study the early and...

20. First low latitudes reconstruction of the dust polarization spectral energy distribution variation

Alessia Ritacco

16/11/2021 09:00

The search for primordial gravitational waves signals imprinted in the Cosmic Microwave Background (CMB) polarization B-modes signal motivates the development of a new generation of high sensitive experiments (e.g. CMB-S4, LiteBIRD), which would be able to trace a signal several orders of magnitude lower than the one in total intensity. However, insidious instrumental and foreground systematic...

19. Statistical separation of dust and CIB with Wavelet Phase Harmonics

Constant Auclair (LPENS)

16/11/2021 09:20

Modelling the emission of Galactic dust is a main challenge for CMB polarization experiments. Current models based on Planck data suffer from the difficulty of separating dust emission from the Cosmic Infrared Background (CIB). We will show that the two components may be statistically separated using their radically different structure on the sky. Our approach uses a state-of-the-art...

10. Moment expansion and the challenge of polarized dust SED complexity for B mode detections.

Léo Vacher (Institut de recherche en astrophysique et planétologie (IRAP))

16/11/2021 09:40

Characterising accurately the polarised dust emission from our Galaxy will be decisive for the quest for the Cosmic Microwave Background (CMB) primordial $B$-modes. The incomplete modelling of its potentially complex spectral properties could lead to biases in the CMB polarisation analyses and to a spurious detection of the tensor-to-scalar ratio $r$. It is particularly crucial for future...

2. Single frequency CMB B-mode inference with realistic foregrounds from a single training image

Dr Niall Jeffrey (École normale supérieure)

16/11/2021 10:00

With a single training image and using wavelet phase harmonic augmentation, we present polarized Cosmic Microwave Back- ground (CMB) foreground marginalization in a high-dimensional likelihood-free (Bayesian) framework. We demonstrate robust foreground removal using only a single frequency of simulated data for a BICEP-like sky patch. Using Moment Networks we estimate the pixel-level posterior...

25. Study of beam side-lobes systematics and calibration for the LiteBIRD mission

Clément Leloup (APC - CNRS)

16/11/2021 10:40

LiteBIRD is a full sky space mission, expected to be launched in the late 2020s, whose goal is to constrain primordial physics via a high precision measurement of CMB polarization. It is a strategic Large-class mission of JAXA and is strongly supported in Europe, in particular by CNES which is in charge of the Medium and High Frequency Telescopes. LiteBIRD's main scientific objective is to...

6. Retrieving cosmology from small scale CMB foregrounds

Marian Douspis (IAS)

16/11/2021 11:00

Small scale CMB data contain a lot of cosmological information hidden in the different components : primordial CMB, tSZ effect, kSZ effect, CIB. Standard analyses assume templates for non primordial CMB component and lose the cosmological signature of large scale structures contained in secondary anisotropies.
I will present a new analysis of SPT data at small scales where the tSZ spectrum...

17. Assessing consistency between CMB temperature and polarization measurements

Adrien La Posta (IJCLab, CNRS, France)

16/11/2021 11:20

CMB observations from the Planck satellite have provided cosmic variance limited temperature measurement at large and intermediate scales. In the next couple of years, ground-based experiments such as SPT, ACT and Simons Observatory will make a high resolution measurement of CMB polarization, allowing the extraction of competitive cosmological informations from $C_\ell^{EE}$ and $C_\ell^{TE}$....

12. Wide-survey of the QUIJOTE CMB experiment

Federica Guidi (IAP)

16/11/2021 11:40

QUIJOTE (Q-U-I JOint TEnerife) is an experiment that operates from the Teide Observatory (Canary islands) at microwave wavelengths (10 < ν < 40 GHz), with the aim to characterise the low frequency polarized Galactic foregrounds, and to study the polarization of the CMB. Recently the Multi Frequency Instrument (MFI) of QUIJOTE concluded a campaign of wide survey observations, providing new maps...

16. The case for a high resolution all-sky millimetre survey

Dr Francois-Xavier Désert (IPAG)

16/11/2021 12:00

A dedicated 15m telescope could map the all-sky in the millimetre, adding 20 arcsecond resolution to Planck all-sky maps. We will present the scientific drivers for that instrument: CMB, lensing, SZ, Cosmic Web, CIB, and Polarized dust. This would provide a European original contribution to the S4 efforts at a moderate cost (20ME).