Kick-off du GDR CoPhy

Liste des Contributions

1. Introduction et Intervention des DAS: Vincent Poireau, Martin Giard, Bertrand Georgeot

17/01/2023 10:30

5. presentation of the GDR and of the WG

17/01/2023 11:00

16. Revue sur l'inflation

Julien Grain

17/01/2023 11:30

22. A Review of The Impact of Deep Learning on the Analysis of Cosmological Galaxy Surveys

Francois LANUSSE (CNRS)

17/01/2023 12:00

17. Cosmological inference from the EFTofLSS

Pierre Zhang

17/01/2023 14:00

13. Massive sterile neutrinos in the early universe: From thermal decoupling to cosmological constraints

Pasquale Serpico (LAPTH)

17/01/2023 14:30

8. Magrathea-Pathfinder: a 3D adaptive-mesh code for geodesic ray tracing in N-body simulations

Michel-Andrès Breton

17/01/2023 15:30

10. Gravitational portals in the early Universe

Simon Clery (IJCLab - Pôle théorie)

17/01/2023 16:00

19. The status of deuterium in precision Big Bang nucleosythesis.

Cyril Pitrou

17/01/2023 16:30

25. Cosmologie Analogue en Laboratoire

Germain ROUSSEAUX (CNRS)

17/01/2023 17:00

Après avoir observé la radiation de Hawking ou la super-radiance de Penrose en laboratoire, effectué les premiers voyages interstellaires dans un trou de ver analogue et plonger dans des trous noirs artificiels, la communauté de Gravitation Analogue migre progressivement vers la Cosmologie Analogue. Dans cette présentation, je sensibiliserai la communauté de Cosmologie Physique aux systèmes...

26. Testing the accuracy of likelihoods for cluster abundance cosmology

Constantin Payerne (LPSC-IN2P3)

17/01/2023 17:20

The abundance of galaxy clusters is a sensitive probe to the amplitude of matter density fluctuations, the total amount of matter in the Universe as well as its expansion history. Inferring correct values and accurate uncertainties of cosmological parameters requires accurate knowledge of cluster abundance statistics, encoded in the likelihood function. We present a framework to test the...

28. Dark energy and string theory

David ANDRIOT (LAPTh, CNRS)

17/01/2023 17:40

"The question of dark energy has been revived in the recent years in string phenomenology, in part due to so-called swampland conjectures. Getting well-controlled string effective theories with de Sitter spacetimes is very challenging, asking the question of alternatives to reproduce observed cosmology (quintessence, multifield inflation, or else).

12. SIBELIUS-DARK: a galaxy catalogue of the local volume from a constrained realization simulation

Guilhem LAVAUX (IAP, CNRS INSU)

18/01/2023 09:00

9. Current and future constraints on cosmology and modified gravitational wave friction from binary black holes

Danièle STEER (APC, Université Paris Diderot, Paris, France)

18/01/2023 09:30

7. Discussions (links with other GDR, Task forces..)

18/01/2023 10:00

11. Constraints on the Optical Depth to Reionization from Balloon-borne Cosmic Microwave Background Measurements

Josquin Errard (APC)

18/01/2023 11:30

20. Status on the H0 tension

Mickael RIGAULT (IP2I (CNRS/IN2P3))

18/01/2023 12:00

18. Constraining spatial curvature with large-scale structure

Julien Larena

18/01/2023 14:00

32. Fast and accurate halo model computation with class_sz

Boris Bolliet (Cambridge University)

18/01/2023 14:30

Class_sz (Bolliet et al) is a code built on Class (Lesgourgues et al) which enables to compute nearly all cosmological power spectra relevant to upcoming CMB and LSS surveys (tsz and ksz, lensing, galaxies, CIB), including cross-correlations and cluster counts for SZ surveys. It is being used in the developpement of pipelines within the Atacama Cosmology Telescope and Simons Observatory. I...

33. Constraining constant and tomographic coupled dark energy with low- and high-redshift probes

Lisa Goh (CEA/Irfu/DAp/LCS)

18/01/2023 14:35

We consider coupled dark energy (CDE) cosmologies, where dark matter particles feel a force stronger than gravity, due to the fifth force mediated by a scalar field which plays the role of dark energy. We perform for the first time a tomographic analysis of coupled dark energy, where the coupling strength is parametrised and constrained in different redshift bins. This allows us to verify...

35. The Universe (not quite) as a Quantum Lab

Thomas Colas (Université Paris Saclay)

18/01/2023 14:40

Abstract: One of the most striking predictions of the standard model of cosmology is to trace back the origin of all the structures of our universe to quantum fluctuations. If we want to access the full implications of this statement, we need to evaluate the quantum information properties of inflationary models. In this talk, I will present the Cosmological Open Quantum System program and...

36. An emulator for the non-linear matter power spectrum in f(R)CDM cosmology.

Iñigo Saez Casares (LUTH/Université Paris Cité/Observatoire de Paris)

18/01/2023 14:45

In order to probe modifications of gravity at cosmological scales one needs accurate theoretical predictions. N-body simulations are required to explore the non-linear regime of structure formation but they are, however, very time consuming. In this work we build an emulator that performs an accurate and fast interpolation between the predictions of a given set of cosmological simulations in...

38. Constraining cosmology with the summer fields of the South Pole Telescope

Federica GUIDI (IAP)

18/01/2023 14:50

The South Pole Telescope (SPT) is a 10-meters diameter telescope observing the Cosmic Microwave Background (CMB) from the South Pole, with angular resolution of arcminutes. A third generation camera (SPT-3G) was mounted on SPT in 2018, showing the remarkable performances of this experiment, which is currently one of the most competitive for CMB science. During the first observing season SPT-3G...

41. Primordial non-Gaussianity in the non-linear matter and halo fields

Gabriel Jung (IAS (Orsay))

18/01/2023 14:55

"Future Large Scale Structure surveys are expected to improve over current bounds on primordial non-Gaussianity (PNG), with a significant impact on our understanding of early Universe physics. However, the level of such improvements strongly depends on the extent to which late time non-linearities erase the PNG signal on small scales.
In this talk, I will present our results based on the...

45. Spectral-Imaging with QUBIC : a new window to galactic foregrounds

Mathias Régnier

18/01/2023 15:00

M. Regnier1, E. Manzan2,3, S. Paradiso2,3, L. Zapelli2 on behalf of
the QUBIC collaboration
1 Universit ́e de Paris, CNRS, Astroparticule et Cosmologie, F-75006 Paris, France
2 Universit`a degli studi di Milano, Milano, Italy
3 INFN sezione di Milano, 20133 Milano, Italy
The Q&U Bolometric Interferometer for Cosmology (QUBIC) is the first
bolometric interferometer that aims at measuring...

30. Accurate galaxy cluster cosmology with the NIKA2 Sunyaev-Zeldovich Large Program

Laurence PEROTTO (LPSC)

18/01/2023 15:40

"Current cosmological studies based on clusters of galaxies are limited by the accuracy with which the mass and the universal properties of these objects can be inferred. The Sunyaev-Zeldovich (SZ) effect is a direct probe of the thermal pressure in the intra-cluster medium. Resolved mapping of the SZ effect towards galaxy clusters is thus the best way to measure their mean radial pressure...

37. MSSM-inflation model revisited

Gilles Weymann-Despres

18/01/2023 16:00

"In this talk, I will show how the minimal supersymmetric model (MSSM) naturally embeds single field inflaton candidates. MSSM is an attractive theory as it also provides a Higgs with a mass as measured at CERN and a candidate for dark matter, whose predicted relic density can be compatible with the Planck measurement. I will therefore focus on three questions:
- how to build such an...

29. Constraintes on dark-matter with galaxies and MUSE

Nicolas BOUCHE (CRAL)

18/01/2023 16:20

"un certain nombres de resultats pertinent sur la matière noire ont été recemment obtenu avec MUSE tel que Regis et al 2021 sur les axions, Zoutendijk et al. 2021 sur les profiles dans les naines, et Bouché et al. 2022 sur les galaxies distantes depuis la cinématique des galaxies. Je propose de presenter une revue rapide de ces résultats et les perspectives dans ce domaine.
"

14. DESI first results with Early Data

Antoine Rocher

18/01/2023 16:40

31. Constraining cosmological models with the effective field theory of large-scale structures

Théo SIMON (Montpellier Universe and Particles Laboratory - CNRS)

18/01/2023 17:10

In this talk, I will present the paradigm of the effective field theory of large-scale structures (EFTofLSS) and how it can be used to constrain cosmological models. First I will discuss the consistency of this theory and its predictive power within the LCDM model, and then I will present the constraints of the EFTofLSS applied to BOSS and eBOSS data on some alternative cosmological models.

21. Neutrino decoupling including flavour oscillations and primordial nucleosynthesis

Maria Cristina VOLPE (Astroparticle and Cosmology (APC) Laboratory/CNRS)

18/01/2023 17:30

15. Weak lensing in the UNIONS survey: Analysis with the galaxy shape measurement pipeline ShapePipe and first results.

Martin Kilbinger

19/01/2023 09:00

39. LSST Observing Strategy: status and impact on cosmology with SNe Ia

Philippe Gris (LPC Clermont-Ferrand - IN2P3/CNRS)

19/01/2023 09:30

This talk will provide an overview of the status and plan of
the LSST Observing Strategy. A particular emphasis will be placed on the
impact of the LSST survey on cosmology with Type Ia Supernovae (SNe Ia).
It will be shown that having a deep survey is critical to measure
cosmological parameters with high accuracy.

23. High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics – From OSQAR experiments up to new projects & perspectives at CERN & CNRS-Grenoble

Pierre Pugnat

19/01/2023 09:50

40. ΛCDM is alive and well

Alain BLANCHARD (IRAP), Alain Blanchard (IRAP)

19/01/2023 10:50

"The concordance model in cosmology, ΛCDM, performs extremely well in accounting for most current cosmological observations with high accuracy.
However, the model faces several tensions with recent cosmological data and their increased accuracy. The discrepancy between the values of the Hubble constant H0 obtained from direct distance scale measurements and the cosmic microwave background...

42. Quantum features of inflationary perturbations

Amaury Micheli (IJCLab)

19/01/2023 11:10

The statistical properties of the CMB anisotropies, reflecting the curvature inhomogeneities in the very early Universe, are very well accounted for by assuming that the inhomogeneities come from amplified vacuum fluctuations; they have a quantum origin.
I will review the long-standing discussions on the possibility of proving this origin and the current nature, classical or quantum,
of the...

34. Constraining the mass and redshift evolution of the hydrostatic mass bias using the gas mass fraction in galaxy clusters

Raphaël Wicker (Institut d'Astropysique Spatiale)

19/01/2023 11:30

"The gas mass fraction in galaxy clusters is a convenient probe to use in cosmological studies, as it can help derive constraints on a collection of cosmological parameters. It is however subject to various effects from the baryonic physics inside galaxy clusters, which may bias the obtained cosmological constraints. Among different aspects of the baryonic physics, in this presentation I focus...

44. Coherent analysis of CMB primary and secondary anisotropies

Marian DOUSPIS (IAS (Orsay))

19/01/2023 11:50

The Cosmic Microwave data at very small scales are known to probe not only primordial CMB fluctuations but also many extragalactic components such as tSZ, kSZ, CIB, points sources.

I will show how to use the cosmological dependent SZ signatures (tSZ and kSZ) at small scales coherently with the large scales and the cosmology framework in Planck and SPT experiments to retrieve both...

43. CMB cosmological constraints from the Temperature and Polarization data of the SPT-3G 2018 survey

karim Benabed

19/01/2023 12:10

First results for the 2018, 4 months survey, of the SPT-3G camera were presented initially using only the EE and TE spectra of the data.
We updated very recently this result adding the TT power spectrum, allowing to improve the previous constraints by around 15%.
I will discuss those new results and their comparison to past and current CMB surveys.

46. Chair: Vincent Vennin

24. Flash talks

3. presentation of the CMB WG

4. presentation of TUG WG

2. presentation the ADE WG

6. Status of last scientific news from the main projects in Cosmology

27. Title: Constraining constant and tomographic coupled dark energy with low- and high-redshift probes

Lisa Goh (CEA/Irfu/DAp/LCS)

Flash Talks

We consider coupled dark energy (CDE) cosmologies, where dark matter particles feel a force stronger than gravity, due to the fifth force mediated by a scalar field which plays the role of dark energy. We perform for the first time a tomographic analysis of coupled dark energy, where the coupling strength is parametrised and constrained in different redshift bins. This allows us to verify...