منابع مشابه
Fermion Damping in a Fermion - Scalar Plasma
In this article we study the dynamics of fermions in a fermion-scalar plasma. We begin by obtaining the effective in-medium Dirac equation in real time which is fully renormalized and causal and leads to the initial value problem. For a heavy scalar we find the novel result that the decay of the scalar into fermion pairs in the medium leads to damping of the fermionic excitations and their in-m...
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Using many-body techniques we obtain the time-dependent Gaussian approximation for interacting fermion-scalar field models. This method is applied to an uniform system of relativistic spin-1/2 fermion field coupled, through a Yukawa term, to a scalar field in 3+1 dimensions, the so-called quantum scalar plasma model. The renormalization for the resulting Gaussian mean-field equations, both stat...
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Since the experimental discovery of the mass of the neutrinos [1] a legitimate question has been posed. Is there a possibility of a bound state between weakly interacting particles such as an electron and a neutrino? If the particles involved where nonrelativistic the answer would be immediate and negative. From numerical studies of the Schrödinger equation [2] the existence of a bound state pr...
متن کاملDamping rate of a fermion in a medium.
We examine the relation between the damping rate of a massless, chiral fermion that propagates in a medium, and the rate Γ of approach to equilibrium. It is proven that these quantities are equal, by showing that they are given by the same formula in terms of the imaginary part of the self-energy evaluated at the energy of the propagating fermion mode. This result is valid provided Γ is defined...
متن کاملFermion–scalar interactions with domain wall fermions
Domain wall fermions are defined on a lattice with an extra direction the size of which controls the chiral properties of the theory. When gauge fields are coupled to domain wall fermions the extra direction is treated as an internal flavor space. Here it is found that this is not the case for scalar fields. Instead, the interaction takes place only along the link that connects the boundaries o...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1999
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.59.105001