Radiative Correction to the Casimir Energy for Massive Scalar Field in The Network

In this paper, we compute the leading-order and first-order radiative corrections to the Casimir energy of a massive Lorentz-violating scalar field governed by a [Formula: see text] interaction on a network. For simplicity, the network is chosen to consist of three edges connected at a single central junction, with the scalar field defined in [Formula: see text] dimensions on each edge. Dirichlet boundary conditions are imposed at the outer ends of the edges, thereby confining the field on the network. Beyond addressing the massive case of a Lorentz-violating scalar field, a key novelty of this work lies in the calculation of the radiative corrections to the Casimir energy using position-dependent counterterms. These counterterms emerge from a systematic renormalization program that consistently incorporates the effects of boundary conditions into the renormalization procedure. To eliminate divergences arising from vacuum energy contributions, we employ the box subtraction scheme in conjunction with cutoff regularization. Our results show that both the leading-order and first-order Casimir energies are negative, regardless of the presence or absence of Lorentz-violating effects, and are in agreement with general physical expectations.