arXiv subjects

Marco Scandurra

Publications and source records attributed to Marco Scandurra.

5 recordsLinked to original sources

arXiv2004

Enhanced radiometric forces

Crookes' Radiometer exploits thermal forces arising from temperature gradients in rarefied gases. This instrument has remained confined to educational physics because of the very small size of the radiometric effect and because of the necessity of an evacuated environment for operation. In this article the physics of this instrument is reviewed, different theories are compared and some general principles are derived. A method for enhancing the radiometric effect and for generating radiometric forces at higher pressures is proposed.

physics.class-ph↗

arXiv2003

Quantum vacuum pressure on a conducting slab

The casimir pressure on a non ideal conducting slab is calculated. Using a simple model for the conductivity according to which the slab is perfectly conducting at frequencies below plasma frequency omega_p and perfectly transparent above such frequency, it is found that the vacuum pressure on each surface of the slab is (h omega_p^4)/(24 pi^2 c^3) which is finite without removal of any divergence

hep-th↗

arXiv2003

QFT Limit of the Casimir Force

High precision measurements of the Casimir effect and recent applications to micro electromechanical systems raise the question of how large the Casimir force can be made in an arbitrarily small device. Using a simple model for the metal boundary in which the metal is perfectly conducting at frequencies below plasma frequency omega_p and perfectly transparent above such frequency, I find that the Casimir force for plate separations a<lambda_p/2, where lambda_p is the plasma wavelength is given by -(h omega_p^4)/(24 pi^2 c^3) which is independent of a. This result is considered the maximum value of the Casimir force for non-ideal metallic boundaries as calculated by quantum field theory. It differs from predictions of non retarded Van der Waals theory. Implications of this result for geometries different from the planar one and in particular for the hollow metallic sphere are discussed.

hep-th↗

arXiv2000

Vacuum energy of a massive scalar field in the presence of a semi-transparent cylinder

We compute the ground state energy of a massive scalar field in the background of a cylindrical shell whose potential is given by a delta function. The zero point energy is expressed in terms of the Jost function of the related scattering problem, the renormalization is performed with the help of the heat kernel expansion. The energy is found to be negative for attractive and for repulsive backgrounds as well.

hep-th↗

arXiv1998

The ground state energy of a massive scalar field in the background of a semi-transparent spherical shell

We calculate the zero point energy of a massive scalar field in the background of an infinitely thin spherical shell given by a potential of the delta function type. We use zeta functional regularization and express the regularized ground state energy in terms of the Jost function of the related scattering problem. Then we find the corresponding heat kernel coefficients and perform the renormalization, imposing the normalization condition that the ground state energy vanishes when the mass of the quantum field becomes large. Finally the ground state energy is calculated numerically. Corresponding plots are given for different values of the strength of the background potential, for both attractive and repulsive potentials.

hep-th↗