Navegando por Autor "Santos, Carlos Eduardo da Hora"

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    Estudo da consistência e soluções clássicas da eletrodinâmica de Maxwell-Carroll-Field- Jackiw-Proca
    (Universidade Federal do Maranhão, 2008-08-21) Santos, Carlos Eduardo da Hora; FERREIRA JUNIOR, Manoel Messias; 021.133.087-62
    In this work, we investigate some significant aspects of the Maxwell-Carroll-Field- Jackiw-Proca (MCFJP) electrodynamics. This electrodynamics is built through the im- plementation of the Carroll-Field-Jackiw(CFJ) term on the Proca Lagrangian. The CFJ term is the CPT odd term of the gauge sector of the Standard Model Extension. First, we verify under which circumstances this model yields a consistent Quantum Field The- ory (QFT) capable of describing the interactions mediated by photons. In this sense, the propagator ‹Aα(k)Av (k)› is carried out, with the dispersion relations and associated propagation modes being determined. Then, we verify which of these modes are stable, causal and unitary. Only when the theory is causal, stable and unitary, we can say that it can be consistently quantized. It follows that the MCFJP electrodynamics is consistent only for a purely space-like background field, Vα = (0; v). A posteriori, we investigate the classical solutions (static and stationary) of MCFJP electrodynamics. The starting point is the wave equation for the gauge field A (r), which through the use of Green Method, yields explicit expressions for A (k). For a purely time-like background field, Vα= (v0; 0), an exponentially decreasing solution for the electric sector is obtained, equal to the Maxwell-Proca solution. Therefore, the background does not promote any change in electric sectors of the MCFJP and MCFJ electrodynamics. On the other hand, the magnetic sector is changed: for stationary currents, it displays an oscillating behavior [in Maxwell-Proca (MP) electrodynamics, these solutions have an exponentially decreasing behavior]. In the limitMA!0, we obtain the stationary field B(r) ofMCFJ electrodynam- ics (oscillating behavior), which is compatible with the emission of Cerenkov radiation. For a purely space-like background, V = (0; v), we obtain stationary solutions at second order in v, assuming v2 M2 A ; and v jj r. It appears that both magnetic and electric sectors display exponentially decreasing solutions, which recover those ones of the MP electrodynamics in the limit v → 0.