Casimir Energy of a Relativistic Perfect Fluid Confined to a D-dimensional Hypercube

Details Casimir Energy of a Relativistic Perfect Fluid Confined to a D-dimensional Hypercube Casimir Energy of a Relativistic Perfect Fluid Confined to a D-dimensional Hypercube

2002-11-22

arxiv.org/abs/math-ph/0211059v1

J.Math.Phys. 44 (2003) 599-610

Physics

Mathematical Physics

20 pages, 4 figures

Scientific paper

10.1063/1.1531822

Compact formulas are obtained for the Casimir energy of a relativistic perfect fluid confined to a $D$-dimensional hypercube with von Neumann or Dirichlet boundary conditions. The formulas are conveniently expressed as a finite sum of the well-known gamma and Riemann zeta functions. Emphasis is placed on the mathematical technique used to extract the Casimir energy from a $D$-dimensional infinite sum regularized with an exponential cut-off. Numerical calculations show that initially the Dirichlet energy decreases rapidly in magnitude and oscillates in sign, being positive for even $D$ and negative for odd $D$. This oscillating pattern stops abruptly at the critical dimension of D=36 after which the energy remains negative and the magnitude increases. We show that numerical calculations performed with 16-digit precision are inaccurate at higher values of $D$.

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