Viser treff 1-20 av 35

• #### Anisotropic contribution to the van der Waals and the Casimir-Polder energies for CO2 and CH4 molecules near surfaces and thin film ﻿

(Journal article; Peer reviewed, 2015)
In order to understand why carbon dioxide ( CO 2 ) and methane ( CH 4 ) molecules interact differently with surfaces, we investigate the Casimir-Polder energy of a linearly polarizable CO 2 molecule and an isotropically ...
• #### Casimir energies for isorefractive or diaphanous balls ﻿

(Journal article; Peer reviewed, 2018)
It is known that the Casimir self-energy of a homogeneous dielectric ball is divergent, although a finite self-energy can be extracted through second order in the deviation of the permittivity from the vacuum value. The ...
• #### Casimir energies of self-similar plate configurations ﻿

(Journal article; Peer reviewed, 2016)
We construct various self-similar configurations using parallel δ-function plates and show that it is possible to evaluate the Casimir interaction energy of these configurations using the idea of self-similarity alone. We ...
• #### Casimir force and its relation to surface tension ﻿

(Journal article; Peer reviewed, 2017)
From energy considerations there is reason to expect that the work done by Casimir forces during a slow displacement of the parallel plates reflects the free energy of the surface tension of the adjacent surfaces. We show ...
• #### Casimir force between a half-space and a plate of finite thickness ﻿

(Journal article; Peer reviewed, 2016)
Zero-frequency Casimir theory is analyzed from different viewpoints, with the aim of obtaining further insight into the delicate Drude-plasma issue that turns up when one considers thermal corrections to the Casimir force. ...
• #### Casimir forces in a plasma: possible connections to Yukawa potentials ﻿

(Journal article; Peer reviewed, 2014)
We present theoretical and numerical results for the screened Casimir effect between perfect metal surfaces in a plasma. We show how the Casimir effect in an electron-positron plasma can provide an important contribution ...
• #### Casimir friction between dense polarizable media ﻿

(Journal article; Peer reviewed, 2013)
The present paper—a continuation of our recent series of papers on Casimir friction for a pair of particles at low relative particle velocity—extends the analysis, so as to include dense media. The situation becomes, in ...
• #### Casimir friction between dense polarizable media ﻿

(Peer reviewed; Journal article, 2013)
The present paper—a continuation of our recent series of papers on Casimir friction for a pair of particles at low relative particle velocity—extends the analysis, so as to include dense media. The situation becomes, in ...
• #### Casimir quantum levitation tuned by means of material properties and geometries ﻿

(Journal article; Peer reviewed, 2014)
The Casimir force between two surfaces is attractive in most cases. Although stable suspension of nano-objects has been achieved, the sophisticated geometries make them difficult to be merged with well-established thin ...
• #### Distance-dependent sign reversal in the Casimir-Lifshitz torque ﻿

(Journal article; Peer reviewed, 2018)
The Casimir-Lifshitz torque between two biaxially polarizable anisotropic planar slabs is shown to exhibit a nontrivial sign reversal in its rotational sense. The critical distance $a_c$ between the slabs that marks this ...
• #### Effect of excess charge carriers and fluid medium on the magnitude and sign of the Casimir-Lifshitz torque ﻿

(Journal article; Peer reviewed, 2019)
Last year, we reported a perturbative theory of the Casimir-Lifshitz torque between planar biaxially anisotropic materials in the retarded limit [Thiyam et al., Phys. Rev. Lett. 120, 131601 (2018)], which is applied here ...
• #### Effective polarisability models ﻿

(Journal article; Peer reviewed, 2017)
Theories for the effective polarizability of a small particle in a medium are presented using different levels of approximation: we consider the virtual cavity, real cavity, and the hard-sphere models as well as a continuous ...
• #### Evaluation of Gas and Oil Dispersion during Subsea Blowouts ﻿

(Master thesis, 2014)
The global demand for hydrocarbons is high and is also believed to be high in the future. Much of today s oil and gas exploration is carried out offshore and consequently, there is a risk if oil and gas blowouts at the ...
• #### Finite-size-dependent dispersion potentials between atoms and ions dissolved in water ﻿

(Journal article; Peer reviewed, 2014)
A non-expanded theory is used for dispersion potentials between atoms and ions dissolved in a medium. The first-order dispersion interaction between two atoms in an excited state must account for the fact that the two atoms ...
• #### Finite-temperature Casimir effect in Randall-Sundrum models ﻿

(Journal article; Peer reviewed, 2010)
The finite-temperature Casimir effect for a scalar field in the bulk region of two Randall–Sundrum models, RSI and RSII, is studied. We calculate the Casimir energy and the Casimir force for two parallel plates with ...
• #### Fluid sensitive nanoscale switching with quantum levitation controlled by a-Sn/b-Sn phase transition ﻿

(Journal article, 2018)
We analyze the Lifshitz pressure between silica and tin separated by a liquid mixture of bromobenzene and chlorobenzene. We show that the phase transition from semimetallic α−Sn to metallic β−Sn can switch Lifshitz forces ...
• #### General bulk-viscous solutions and estimates of bulk viscosity in the cosmic fluid ﻿

(Journal article; Peer reviewed, 2016)
We derive a general formalism for bulk viscous solutions of the energy-conservation equation for ρ(a,ζ) ρ(a,ζ) , both for a single-component and a multicomponent fluid in the Friedmann universe. For our purposes, these ...
• #### Ice particles sink below the water surface due to a balance of salt, van der Waals and buoyancy forces ﻿

(Journal article; Peer reviewed, 2018)
According to the classical Archimedes’ principle, ice floats in water and has a fraction of its volume above the water surface. However, for very small ice particles, other competing forces such as van der Waals forces due ...
• #### Inflation in terms of a viscous van der Waals coupled fluid ﻿

(Journal article; Peer reviewed, 2018)
We propose to describe the acceleration of the universe by introducing a model of two coupled fluids. We focus on the accelerated expansion at the early stages. The inflationary expansion is described in terms of a van der ...
• #### Lifshitz interaction can promote ice growth at water-silica interfaces ﻿

(Journal article; Peer reviewed, 2017)
At air-water interfaces, the Lifshitz interaction by itself does not promote ice growth. On the contrary, we find that the Lifshitz force promotes the growth of an ice film, up to 1–8 nm thickness, near silica-water ...