Objectif The project ARTHUS aims at determining the physical origin of Dark Energy: in addition to the energy sources of the standard model of cosmology, effective terms arise through spatially averaging inhomogeneous cosmological models in General Relativity. It has been demonstrated that these additional terms can play the role of Dark Energy on large scales (but they can also mimic Dark Matter on scales of mass accumulations). The underlying rationale is that fluctuations in the Universe generically couple to spatially averaged intrinsic properties of space, such as its averaged scalar curvature, thus changing the global evolution of the effective (spatially averaged) cosmological model. At present, we understand these so- called backreaction effects only qualitatively. The project ARTHUS is directed towards a conclusive quantitative evaluation of these effects by developing generic and non-perturbative relativistic models of structure formation, by statistically measuring the key-variables of the models in observations and in simulation data, and by reinterpreting observational results in light of the new models. It is to be emphasized that there is no doubt about the existence of backreaction effects; the question is whether they are even capable of getting rid of the dark sources (as some models discussed in the literature suggest), or whether their impact is substantially smaller. The project thus addresses an essential issue of current cosmological research: to find pertinent answers concerning the quantitative impact of inhomogeneity effects, a necessary, worldwide recognized step toward high-precision cosmology. If the project objectives are attained, the results will have a far-reaching impact on theoretical and observational cosmology, on the interpretation of astronomical experiments such as Planck and Euclid, as well as on a wide spectrum of particle physics theories and experiments. Champ scientifique natural sciencesphysical sciencesrelativistic mechanicsnatural sciencesphysical sciencestheoretical physicsparticle physicsnatural sciencesphysical sciencesastronomyastrophysicsdark matternatural sciencesphysical sciencesastronomyphysical cosmology Mots‑clés General Relativity Averaging Problem Cosmological Perturbation Theory Gravitational Entropies Morphological Statistics Galaxy Catalogues Extragalactic Observations Cosmic Microwave Background Programme(s) H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC) Main Programme Thème(s) ERC-2016-ADG - ERC Advanced Grant Appel à propositions ERC-2016-ADG Voir d’autres projets de cet appel Régime de financement ERC-ADG - Advanced Grant Institution d’accueil UNIVERSITE LYON 1 CLAUDE BERNARD Contribution nette de l'UE € 2 091 000,00 Adresse BOULEVARD DU 11 NOVEMBRE 1918 NUM43 69622 Villeurbanne Cedex France Voir sur la carte Région Auvergne-Rhône-Alpes Rhône-Alpes Rhône Type d’activité Higher or Secondary Education Establishments Liens Contacter l’organisation Opens in new window Site web Opens in new window Participation aux programmes de R&I de l'UE Opens in new window Réseau de collaboration HORIZON Opens in new window Coût total € 2 091 000,00 Bénéficiaires (1) Trier par ordre alphabétique Trier par contribution nette de l'UE Tout développer Tout réduire UNIVERSITE LYON 1 CLAUDE BERNARD France Contribution nette de l'UE € 2 091 000,00 Adresse BOULEVARD DU 11 NOVEMBRE 1918 NUM43 69622 Villeurbanne Cedex Voir sur la carte Région Auvergne-Rhône-Alpes Rhône-Alpes Rhône Type d’activité Higher or Secondary Education Establishments Liens Contacter l’organisation Opens in new window Site web Opens in new window Participation aux programmes de R&I de l'UE Opens in new window Réseau de collaboration HORIZON Opens in new window Coût total € 2 091 000,00
