Objectif The structure of relativistic quantum vacuum (RQV) in our Universe is one of the main challenges in modern physics. We plan to advance our understanding of the vacuum structure and on this basis treat the most important unsolved problems in physics, such as the cosmological constant problem (why the measured vacuum energy is 120 orders of magnitude smaller than estimates from the zero point motion) and the hierarchy problem (why the masses of the known particles in the Standard Model (SM) of particle physics are much smaller than the Planck energy). The quantum vacuum shares many common properties with topological matter. The goal of the proposal is to concentrate both theoretical and experimental efforts in the investigation of connections between the topological quantum matter and RQV, to enhance understanding of topological condensed-matter systems especially in the ultra-low-temperature regime, and to apply this experience to solution of problems in SM & cosmology. As a condensed-matter system we shall use superfluid phases of liquid 3He – unique topological materials, which are the most close to SM and gravity: Superfluid 3He-A, where the low-energy excitations are topologically protected Weyl fermions, gauge bosons, and gravitons, is similar to the vacuum of SM above the electroweak transition. The fully gapped topological superfluid 3He-B with its Higgs bosons is the counterpart of SM vacuum in its broken symmetry phase. In particular, theory of relaxation of dark energy will be accompanied by experimental study of resonant decay of coherent states of non-equilibrium superfluid vacuum. Determination of the topological classes of the quantum vacua of SM including the vacua with Majorana fermions will be accompanied by experimental studies of Majorana fermions on the boundaries of topological superfluids and in cores of quantized vortices. Theory of extra Higgs bosons in SM will be accompanied by experimental study of light and heavy Higgs modes in 3He-B. Champ scientifique natural sciencesphysical sciencestheoretical physicsparticle physicsfermionsnatural sciencesphysical sciencesquantum physicsquantum field theorynatural sciencesphysical sciencesastronomyastrophysicsdark matternatural sciencesphysical sciencesastronomyphysical cosmologynatural sciencesphysical sciencestheoretical physicsparticle physicshiggs bosons Mots‑clés topological matter superfluid 3He Majorana fermions relativistic quantum vacuum cosmological constant Programme(s) H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC) Main Programme Thème(s) ERC-ADG-2015 - ERC Advanced Grant Appel à propositions ERC-2015-AdG Voir d’autres projets de cet appel Régime de financement ERC-ADG - Advanced Grant Institution d’accueil AALTO KORKEAKOULUSAATIO SR Contribution nette de l'UE € 2 159 191,00 Adresse OTAKAARI 1 02150 Espoo Finlande Voir sur la carte Région Manner-Suomi Helsinki-Uusimaa Helsinki-Uusimaa 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 € 2 159 191,00 Bénéficiaires (1) Trier par ordre alphabétique Trier par contribution nette de l'UE Tout développer Tout réduire AALTO KORKEAKOULUSAATIO SR Finlande Contribution nette de l'UE € 2 159 191,00 Adresse OTAKAARI 1 02150 Espoo Voir sur la carte Région Manner-Suomi Helsinki-Uusimaa Helsinki-Uusimaa 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 € 2 159 191,00