Densidade de energia e força de radiação sobre fronteiras em movimento num espaço-tempo bidimensional

Abstract

In the present work, we investigate the energy density and the quantum radiation reaction force on one moving boundary which imposes on a massless scalar field a Dirichlet or a Neumann boundary condition. Though we assume a particular motion for the boundary, introduced by Walker and Davies many years ago (J. Phys. A, 15 L477, 1982), we consider new possibilities for the initial field state, namely, thermal state and coherent state. We also investigate the problem of a cavity with one of the boundaries in the particular motion proposed by Walker and Davies, taking into account the vacuum, thermal and coherent initial field states. Finnaly we investigate the case of a non-static boundary which imposes the Robin boundary condition to the field.