کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1851678 | 1528822 | 2014 | 4 صفحه PDF | دانلود رایگان |
It is shown that it is possible to consistently and gauge invariantly formulate models where the coupling constant is a non-trivial function of a scalar field. In the U(1)U(1) case, the coupling to the gauge field contains a term of the form g(ϕ)jμ(Aμ+∂μB)g(ϕ)jμ(Aμ+∂μB) where B is an auxiliary field and jμjμ is the Dirac current. The scalar field ϕ determines the local value of the coupling of the gauge field to the Dirac particle. The consistency of the equations determines the condition ∂μϕjμ=0∂μϕjμ=0 which implies that the Dirac current cannot have a component in the direction of the gradient of the scalar field. As a consequence, if ϕ has a soliton behaviour, like defining a bubble that connects two vacua, we obtain that the Dirac current cannot have a flux through the wall of the bubble, defining a confinement mechanism where the fermions are kept inside those bags. Consistent models with time dependent fine structure constant can be also constructed
Journal: Physics Letters B - Volume 734, 27 June 2014, Pages 245–248