[sém. UCN/théorie] Neutron echo from hidden braneworlds

by Michael Sarrazin (Univ Namur)

Wednesday 12 Jul 2017, 14:00 → 15:00 Europe/Paris

Salle 9

Multi-braneworld Universe is at the heart of many scenarios of physics beyond the standard model of particle physics or beyond the cosmological ΛCDM model. Neutron disappearance (reappearance) toward (from) a hidden brane can be tested with high-precision experiments to constrain the coupling constant g between the visible and hidden sectors. g can be derived as any pair of braneworlds is equivalent to a noncommutative two-sheeted spacetime M4 × Z2 regarding the sub-GeV-scale dynamics of particles. We present how to derive g – for a neutron – for two braneworlds, in a 5D bulk, endowed with their own copy of the standard model in a string-inspired phenomenological toy model. We present the MURMUR experiment, a forthcoming passing-through-walls-neutron experiment, which could detect neutron disappearance/reappearance. From previous experiments, constraints on brane energy scale (i.e. brane thickness) and interbrane distance are given, making Planck scale reachable.