Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-03-25
Phys.Atom.Nucl. 64 (2001) 1337-1346; Yad.Fiz. 64 (2001) 1413-1422
Physics
High Energy Physics
High Energy Physics - Theory
8 pages, no figures, latex
Scientific paper
10.1134/1.1389563
The vacuum energy-momentum tensor (EMT) and the vacuum energy corresponding to massive scalar field on $\Re_{t}\times [0,l] \times \Re^{D-2}$ space-time with boundary condition involving a dimensional parameter ($\delta$) are found. The dependent on the cavity size $l$ Casimir energy $\wt E_{C}$ is a uniquely determinable function of mass $m$, size $l$ and "skin-depth" $\delta$. This energy includes the "bulk" and the surface (potential energy) contributions. The latter dominates when $l \sim \delta$. Taking the surface potential energy into account is crucial for the coincidence between the derivative $-\d \wt E_{C}/\d l$ and the $ll$-component of the vacuum EMT. Casimir energy $\wt E_C$ and the bulk contribution to it are interconnected through Legendre transformation, in which the quantity $\delta^{-1}$ is conjugate to the vacuum surface energy multiplied by $\delta$. The surface singularities of the vacuum EMT do not depend on $l$ and, for even $D$, $\delta =0$ or $\infty$, possess finite interpretation. The corresponding vacuum energy is finite and retains known analytical dependence on the dimension $D$.
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