Cosmologie

Chercher les ondes gravitationnelles primordiales avec QUBIC : optimisation de la construction de cartes du ciel

La quêtes des modes B de polarisation du fond diffus cosmologique (Cosmological Microwave Background, CMB) est le challenge principal de la cosmologie observationnelle. Mesurer les modes B de polarisation du CMB sera une preuve claire de l’existence d’ondes gravitationnelles produites environ 10-35 secondes après le temps de Planck durant une phase d’inflation cosmologique. Leur présence serait un résultat important concernant la gravité quantique car l’existence de modes tensoriels signifierait que la métrique est quantifiée.

Le centre Cosmos, sciences et sociétés lance son nouveau site de médiation scientifique en astrophysique

En 2025, le Paris Center for Cosmological Physics (PCCP) est devenu le centre Cosmos, sciences et sociétés (CSS). Ce changement de nom s’accompagne désormais d'un nouveau logo et d'un nouveau site internet. Une évolution qui réaffirme l’ADN du centre : une structure de médiation scientifique rattachée au laboratoire APC qui œuvre pour créer des liens entre la recherche fondamentale en astrophysique et la société civile. Découvrez leur nouveau site internet et leurs actions.

SEARCHING FOR PRIMORDIAL GRAVITATIONAL WAVES WITH QUBIC: Characterization of the atmosphere at Alto Chorrillos

The quest for B-mode polarization of the Cosmic Microwave Background is the primary challenge in Observational Cosmology and is pursued by a worldwide effort. Measurement of B-mode polarization in the CMB will be clear evidence of primordial gravitational waves which are theoretically expected to be produced during inflation at about 10-35 seconds after the Planck epoch. Their presence would be a non-trivial result concerning quantum gravity because tensor modes would mean the metric must be quantized.

SEARCHING FOR PRIMORDIAL GRAVITATIONAL WAVES WITH QUBIC: Pipeline development and cosmological constraints

The quest for B-mode polarization of the Cosmic Microwave Background is the primary challenge in Observational Cosmology and is pursued by a worldwide effort. Measurement of B-mode polarization in the CMB will be clear evidence of primordial gravitational waves which are theoretically expected to be produced during inflation at about 10-35 seconds after the Planck epoch. Their presence would be a non-trivial result concerning quantum gravity because tensor modes would mean the metric must be quantized.

The galaxy luminosity and mass function in Euclid clusters and protoclusters: cosmology and galaxy evolution

The Ph.D. student will be responsible for measuring the cluster galaxy mass and luminosity functions with Euclid DR1 data and to publish scientific results related to these measurements in one refereed paper. S.he will use software developed by our team engineers and will write the software necessary for the scientific analysis. The Euclid DR1 will permit us to measure luminosity and mass functions up to redshift z~1-1.5. At redshift z~2 and beyond, the Ph.D. student will combine Euclid and DESI observations to measure high redshift galaxy luminosity functions. This work is in collaboration with colleagues at Stanford University, in Stanford, USA/Center Pierre Binetruy (CPB)/UC Berkeley. The Ph.D. student will work within the Euclid team at APC, which include 2 Ph.D. students, and a postdoc, in the larger context of the Euclid consortium, the APC (https://apc.u-paris.fr/) Cosmology team (https://apc.u-paris.fr/fr/cosmologie), and the CPB (https://www.cpb.in2p3.fr/).

Astrocent devient le nouvel institut international de l'Académie des Sciences de Pologne

Le 17 février 2026, l'Académie des Sciences de Pologne (Polska Akademia Nauk - PAN) a officiellement créé l'International Institute for Particle Astrophysics, qui opère sous le nom d'Astrocent. Basé à Varsovie, c'est le premier institut d'Europe centrale et orientale entièrement dédié à l'astrophysique des particules. Le Laboratoire APC, partenaire d'Astrocent, jouera un rôle important dans ce projet dont le développement est soutenu par une enveloppe de 30 millions d'euros de financements européens et nationaux.

The galaxy luminosity and mass function in Euclid clusters and protoclusters: cosmology and galaxy evolution

The Ph.D. student will be responsible for measuring the cluster galaxy mass and luminosity functions with Euclid DR1 data and to publish scientific results related to these measurements in one refereed paper. S.he will use software developed by our team engineers and will write the software necessary for the scientific analysis. The Euclid DR1 will permit us to measure luminosity and mass functions up to redshift z~1-1.5. At redshift z~2 and beyond, the Ph.D. student will combine Euclid and DESI observations to measure high redshift galaxy luminosity functions.
Cosmologie