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Matthieu Tristram (IJClab, CNRS, France)04/12/2023 10:30
We present constraints on cosmological parameters using maps from the last Planck data release (PR4). In particular, we detail an upgraded version of the cosmic microwave background likelihood, HiLLiPoP, based on angular power spectra and relying on a physical modelling of the foreground residuals in the spectral domain. This new version of the likelihood retains a larger sky fraction (up to...
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Giacomo Galloni (University of Rome Tor Vergata)04/12/2023 10:50
In my recent publication (arXiv:2208.00188), I adopted a comprehensive approach to refine the constraints on the tensor-to-scalar ratio ($r$) and the tensor spectral index ($n_t$). This involved utilizing data from 10 datasets, including those from the BICEP/Keck Array 2015 and 2018, Planck releases 3 and 4, and the LIGO-Virgo-KAGRA collaboration. During this presentation, I will walk through...
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Jacques Delabrouille (IN2P3)04/12/2023 11:10
Publicly available maps of Galactic CO emission form Planck are contaminated by noise and/or emission from other foregrounds (SZ clusters, IR and radio sources, Galactic dust). Using a modified version of GNILC, we post-process existing Planck CO maps to produce substantially cleaner full-sky maps for the first three rotational lines of Galactic CO.
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Elisa Russier04/12/2023 11:30
We present new dust intensity and polarization maps obtained from Planck PR4 frequency maps.
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Those maps are obtained using a modified version of GNILC that allows for better angular resolution in the final dust maps. -
Gabriel Jung (IAS Orsay)04/12/2023 11:50
Precise measurements of the CMB temperature fluctuations have highlighted the presence of unexpectedly strong anomalies on the largest scales. Among the possible explanations of these deviations, the role of the local large-scale structure (LSS), which contributes to the CMB signal via secondary anisotropies on these large scales, needs to be fully investigated.
In this talk, I will present...
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Baptiste Jost (IPMU)04/12/2023 12:10
Precise measurements of the faint primordial B-modes originating from cosmological inflation (parameterized by r), or from EB correlations coming from parity-violating mechanisms in the Universe (parameterized by the isotropic cosmic birefringence angle, β), require meticulous attention to the removal of Galactic foregrounds and the mitigation of systematic effects, as well as the interplay...
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Dr Ali Rida Khalife (IAP)04/12/2023 16:45
Since its appearance almost a decade ago, the Hubble Tension received a great deal of proposals to solve it, with none being completely successful. However, new state of the art data improve our assessment of these models and better constrain their parameters.
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In this talk, an evaluation of eleven cosmological models is presented. These models consist of five classical extensions of ΛCDM,... -
Lennart Balkenhol (Institut d'Astrophysique de Paris)04/12/2023 17:05
CMB power spectrum measurements from ground-based experiments are expected to match and surpass Planck-precision on cosmological parameters in the immediate future. With this constraining power comes great responsibility; the potential of detecting physics beyond the standard model demands a demonstrably robust analysis.
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In this talk, I present a differentiable likelihood for CMB analysis... -
Xavier COULON (IAS)04/12/2023 17:25
In the 1990s, the COBE/FIRAS mission measured the Cosmic Microwave Background (CMB) spectrum and showed that the CMB spectral energy distribution is close to a perfect blackbody. However, the CMB spectrum contains tiny departures from a perfect blackbody to $\Delta I/I \simeq 10^{-5}$. These are referred to as spectral distortions.
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The two main types of CMB spectral distortions are the... -
Mathias Regnier (APC)04/12/2023 17:45
Spectral Imaging relies on the interferometric nature of a bolometric interferometer: the combination of fringes at the focal plane formed by the aperture array in the pupil plane results in a point spread function for the instrument that exhibits multiple peaks, each with a width corresponding to the angular resolution of the instrument. The angular distance separating the peaks is...
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Arianna Rizzieri (APC)04/12/2023 18:05
Performing an efficient and reliable component separation is of fundamental importance for the data analysis of the current CMB experiments targeting primordial B-modes. In this talk I will present an extension of the parametric maximum likelihood-based component separation technique, where in the likelihood implementation it is allowed to go back and forth from the pixel to the harmonic...
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Adélie Gorce (McGill University)05/12/2023 14:00
During the Epoch of Reionisation (EoR), neutral hydrogen in the intergalactic medium can emit radiation through the 21cm hyperfine transition. The 21cm signal is a direct probe of this epoch, but a notoriously difficult observation to make.
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On the other hand, the kinetic Sunyaev-Zel'dovich effect (pkSZ) is induced by the scattering of CMB photons with a medium of free electrons that possess a... -
Corentin Hanser (UGA)05/12/2023 14:20
The Sunyaev-Zeldovich effect offers a powerful probe of the large-scale structures up to high redshifts. SZ-based cosmology, however, requires a precise characterization of cosmological tools such as a mass-observable scaling relation and a mean electronic pressure profile. Systematic effects, in particular at high redshift, have an impact on these tools and are currently the main limitation...
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M. Alexandre Huchet (CEA Saclay)05/12/2023 14:40
We present the first CMB-lensing galaxy cluster mass measurement using a combination of ground and space-based surveys (SPT-SZ and Planck). We measure the signal at 4.8 sigma, a significant gain with respect to measurements performed on the two individual datasets. In particular, we show that we take advantage of correlations between the scales observed by SPT-SZ and the scales observed by...
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Gaspard Aymerich (Institut d'Astrophysique Spatiale, Université Paris-Saclay)05/12/2023 15:00
Galaxy clusters are a powerful cosmological probe: they track the latest evolution of large scale structure and are therefore fundamental for testing the cosmological model in the recent Universe.
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CMB experiments represent a great opportunity for cosmology with galaxy clusters: due to the inverse Compton scattering of CMB photons by the hot gas of clusters, they are signal-limited, full-sky... -
Stefano Gallo05/12/2023 15:20
Galaxy cluster number counts are an important probe to constrain cosmological parameters. One of the main ingredients of the analysis, along with accurate estimates of the clusters' masses, is the selection function, and in particular the completeness, associated to the cluster sample one is considering. Incorrectly characterising this function can lead to biases in the cosmological...
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Emma Ayçoberry (IAP)05/12/2023 15:40
The distribution of matter in the Universe is a powerful probe of cosmology. Measuring the efficiency with which gravity produces clusters against expanding Universe is the key to understanding, e.g. the equation of state of dark energy. Numerous projects aim at measuring the matter distribution across time in the Universe but no observable gives the perfect figure of this distribution...
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