Sub-GeV-scale signatures of hidden braneworlds up to the Planck scale in a SO(3,1)-broken bulk
Résumé
Many-brane Universes are at the heart of several cosmological scenarios related to physics beyond the Standard Model. It is then a major concern to constrain these approaches. Two-brane Universes involving SO(3, 1)-broken 5D bulks are among the cosmological models of interest. They also allow considering matter exchange between branes, a possible way to test these scenarios. Neutron disappearance (reappearance) toward (from) the hidden brane is currently tested with high-precision experiments to constrain the coupling constant g between the visible and hidden neutron sectors. When dealing with the sub-GeV-scale quantum dynamics of fermions, any pair of braneworlds can be described by a noncommutative two-sheeted space–time M4 × Z2 from which g emerges. Nevertheless, the calculation of the formal link between g for a neutron and SO(3, 1)-broken 5D bulks remains an open problem until now although necessary to constrain these braneworld scenarios. Thanks to a phenomenological model, we derive g — for a neutron — between the two braneworlds endowed with their own copy of the Standard Model in an SO(3, 1)-broken 5D bulk. Constraints on interbrane distance and brane energy scale (or brane thickness) are discussed. While brane energy scale below the GUT scale is excluded, energy scale up to the Planck limit allows neutron swapping detection in forthcoming experiments.
Mots clés
11.25.Wx
11.10.Kk
12.60.-i
28.20.-v
Brane phenomenology
hidden braneworld
neutron-hidden neutron
neutron disappearance-reappearance
cosmological model
field theory: higher-dimensional
membrane model
SO(3
1)
hidden symmetry
domain wall
space-time: noncommutative
n: flux
potential: magnetic
potential: vector
toy model
scale: Planck
scale: grand unified theory
numerical calculations
new physics